April
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Don't be fooled, for preservation, Earth's ends is where we'd go to tell you that April is the fourth month of the year in the Gregorian calendar. The following events took place in the month of April:
- Every year — April Fools' Day.
- 19?? — Colorist Val Staples is born.
- 19?? — Mau Pérez (Mexican voice of Predacon Megatron in War for Cybertron Trilogy and also Cyclonus and Grimlock) is born.
- 1922 — KB Toys is founded, originally named Kay Bee Toys.
- 1950 — Hubert Drac (French voice of Red Alert in the 2004 Armada video game) is born.
- 1958 — Robert Missler (German voice of Rattrap) is born.
- 1964 — Marvel Comics letterer Bill Oakley is born.
- 1965 — Thomas Schmuckert (German voice of Chase, Denny Clay, War for Cybertron Trilogy Red Alert and more) is born.
- 1968 — Composer Cher Watanabe is born.
- 1974 — Hyeon Gyeongsu (Korean voice of Isaac Sumdac in Animated) is born.
- 1976 — Troy Baker (voice of Jetfire, Zeta Prime, Jazz, Kickback, Steeljaw, Shockwave and more) starts his legend in the 20th century.
- 1979 — Nickelodeon makes its debut onto the airwaves.
- 1980 — Angela Brusa (Italian voice of Airachnid) is born.
- 1984 — Musician Marvin Gaye is assassinated at age 44 just one day short of his 45th birthday.
- 1997 — The Beast Wars episode "Other Voices, Part 2" premieres in the US.
- 1998 — The Beast Wars II cartoon premieres in Japan with the episode "The New Forces Arrive!".
- 2003 — Rooster Teeth is founded.
- 2003 — Ito Yokaido stores offer the "Street Speed Overdrive Edition" Microns (Auto, Nitro, Sieg), one free with the purchase of any Legends of the Microns product.
- 2006 — The Cybertron episode "United" premieres in the US.
- 2008 — "Shattered Expectations" is revealed to be an April Fools' joke. Many souls are crushed.
- 2009 — Maximum Dinobots #4, "Spotlight: Jazz" and Best of UK: City of Fear #3 are released by IDW Publishing.
- 2012 — Dark of the Moon was nominated for eight Razzies, but did not win any. We can let you know, that it was not an April Fools Joke.
- 2014 — Tubi is launched.
- 2014 — Cartoon Network TOO is shut down and replaced with Cartoon Network +1, a 1-hour timeshift of Cartoon Network.
- 2015 — The Robots in Disguise episode "Sideways" premieres in Hungary and Poland.
- 2015 — The Rescue Bots entire second season premieres in Brazil on Netflix.
- 2016 — Rescue Bots: "Land Before Prime" is released on DVD by Beyond Home Entertainment in Australia.
- 2017 — TakaraTomy releases Masterpiece MP-36 Megatron.
- 2019 — Bumblebee gets released on VHS.
- 2020 — Transformers: The Definitive G1 Collection Volume 92: Transformers: The Movie is released by Hachette Publishing.
- 2023 — During the 2023 NCAA Men’s Final Four, Optimus Prime and Optimus Primal make appearances during the game to promote Transformers: Rise of the Beasts in what may be the very first-ever live mixed-reality TV spot.
- 2023 — The EarthSpark episode "Secret Legacy, Part 1" premieres in Cantonese.
- 2024 — Final day to pre-order the Super Groupies x Transformers Collaboration.
- 2024 — J-Pop group Sexy Zone is now renamed "timelesz".
- 2026 — TakaraTomy uploads the "Business Trip! Wild King Research Institute - Episode 9 -" to YouTube.
- 1923 — Director Al Kouzel is born in Manhattan.
- 1927 — Ken Sansom (voice of Generation One Hound and Paul Gates) is born.
- 1939 — Musician Marvin Gaye is born.
- 1948 — Peter Harryson (second voice actor for Jazz in the Swedish dub of Generation One) is born.
- 1950 — Voice actor Allan Corduner is born.
- 1953 — Wojciech Machnicki (Polish voice of Soundwave, Buzzsaw, Octopunch, Ziegler and more)
- 1959 — Sanae Miyuki (voice of Little girl) is born.....Bingo!
- 196? — Chris Ryall, editor-in-chief at IDW Publishing, is born in San Diego.
- 1960 — Takashi Matsuyama (voice of Megastorm, Powerhug, Rockbuster, God Magnus and Japanese voice of Bishop) is born.
- 1965 — Andréa Murucci (Brazilian voice of Darcy Tirrel and Amber) is born.
- 1967 — Matthias Rimpler (German voice of Hooch) is born.
- 1968 — Rossy Aguirre (Mexican voice of Chak and Dorie Dutton) is born.
- 1975 — Lisa Ann Beley (voice of Override and Lori's Mother) is born.
- 1978 — Ana Lobo (Mexican voice of T-AI and Arcee) is born.
- 1991 — Singer Quavo is born.
- 1992 — Adin Rudd (voice of Scrapface in the Transformers: War for Cybertron Trilogy) is born.
- 1996 — Brooke Goldner (voice of Cyberwarp and also Hasbro CEO Brian Goldner's daughter) is born.
- 1997 — Hinako Sakurai (Japanese voice of Izabella) is born.
- 2003 — The Armada Volume 1 TPB is released in the US by Dreamwave Productions.
- 2004 — The Superlink episode "Kicker Targeted" premieres in Japan.
- 2005 — The Galaxy Force episode "Atlantis' Offense and Defense" premieres in Japan.
- 2007 — The Linkin Park single "What I've Done" is released by Warner Bros..
- 2008 — Best of UK: Dinobots #6 is released by IDW Publishing.
- 2008 — Columbia Music Entertainment releases the Transformers Music Matrix DVD in Japan.
- 2009 — Artist Frank Springer dies of prostate cancer.
- 2012 — The Transformers: Prime episode "Stronger, Faster" premieres in Brazil.
- 2013 — The Transformers: Rescue Bots episode "The Other Doctor" premieres in Brazil.
- 2016 — The Robots in Disguise episode "Bumblebee's Night Off" premieres on Cartoon Network UK, while "Misdirection" premieres on Cartoon Network USA.
- 2016 — The Robots in Disguise episode "Metal Meltdown" premieres in France.
- 2016 — "Micro-Aggressions" is released by Fun Publications.
- 2019 — Bumblebee is released on DVD, Blu-Ray, and 4K Ultra HD.
- 2019 — Sector 7 Adventures: The Battle at Half Dome is released.
- 2020 — The Generations Selects Special Comic Super Megatron comic 1 is first published.
- 2021 — The digital code for the Bumblebee film home media releases expires.
- 2023 — Beast Wars Again begins its broadcast run on TV Tokyo with "Enter the Super Lifeform Transformers!! (Part 1)".
- 2026 — The Evend Exclusive Limited Edition Funko Pop Optimus Prime is officially revealed.
- 1949 — Riccardo Peroni (Italian voice of Tarantulas, Brother Gunter and H.B. Luskey) is born.
- 1963 — Daniela Hoffmann (German voice of Scatterspike) is born.
- 1964 — Lorella De Luca (Italian voice of June Darby and Realtor) is born.
- 1970 — Marie-Line Landerwyn (French voice of Chickadee and voice directress of the French dubs of Rescue Bots and Rescue Bots Academy) is born.
- 1975 — Amanda Borghetti (Brazilian voice of Cyberwarp) is born.
- 1979 — David Willis is born. Whoopee.
- 1994 — Writer Maasai Singleton is born.
- 2002 — Transformers: Generation 1: Prime Directive #1 is released by Dreamwave Productions.
- 2006 — The first show in the Kiss Players radio drama series airs in Japan on the "Lyrian Moe-tchao" program.
- 2008 — A 3-page preview of "Shattered Glass" (the real one) is revealed through the Fun Publications Official Transformers Collectors' Club website.
- 2010 — Transformers Animated begins airing in Japan at 8am via TV Aichi and TV Tokyo, premiering "A New Chapter! Transformers".
- 2012 — Meet Team Prime and Attack of the Scraplets! are published by Little, Brown and Company.
- 2013 — Spotlight: Trailcutter is released by IDW Publishing.
- 2014 — The fourth BotCon 2014 box set exclusive Scorponok is revealed.
- 2014 — Transformers Cloud: Spacetime World: Guardians of Time Chapter 2: Part 6 is first published.
- 2016 — Kōji Wada passes away from cancer at age 42.
- 2016 — The Robots in Disguise episode "Impounded" premieres on Cartoon Network UK.
- 2016 — The Robots in Disguise episode "Suspended" premieres in France.
- 2019 — Transformers: Cyberverse - "Terminal Velocity" is released in Australia by Beyond Home Entertainment.
- 2019 — Transformers: The Definitive G1 Collection Volume 54: A Better Tomorrow is released by Hachette Partworks.
- 2019 — Transformers: Unicron TPB is released by IDW Publishing.
- 2021 — The Rescue Bots Academy episodes "More Than Meets the Eye" and "Things That Go Bot in the Night" premieres in the United States.
- 2024 — Void Rivals #8 is released by Image Comics and Skybound Entertainment.
- 2025 — Auldey reveals their Transformers Alpha Action Elite S Optimus Prime, Starscream & Shattered Glass Soundwave on weibo.
- 2026 — Preorders for the Transformers New Legends NL-02 Menasor G2 Color Ver. and MPG-23 Secret Agent Arcee go up.
- 1915 — Director Bob Bemiller is born.
- 1923 — Warner Bros. is established.
- 1945 — Sergio Di Giulio (Italian voice of Cyclonus/Snow Cat) is born.
- 1947 — Jacques Frantz (European French voice of Optimus Prime in the live-action film series) is born.
- 1949 — Klaus-Dieter Klebsch (German voice of Prime Optimus Prime from season 2 onwards as well as Tom Banachek and Lockdown) is born.
- 1949 — NATO is formed as a counter to the Soviet Union.
- 1960 — Hugo Weaving (English voice of Megatron in the Live-action film series) is born. Mr. Anderson.
- 1964 — Robbie Rist (English voice of Swelter and Tricerashot on Robots in Disguise) is born.
- 1970 — Renzo Jiménez (Latin-American Spanish voice of Cyclonus/Snow Cat) is born.
- 1974 — Masashi Endō (Japanese voice of Scorpos and Scrapper) is born.
- 1984 — Anja Stadlober (German voice of Maggie Madsen) is born.
- 1986 — David Hernán (Castilian Spanish voice of Wheeljack in Transformers: War for Cybertron Trilogy) is born.
- 1989 — The Victory episode "Attack! Leozack" premieres in Japan.
- 1996 — Shinba Tsuchiya (Japanese voice of Tripp Summers) is born.
- 2001 — Transformers: Car Robots—Vol. 10 is released on DVD in Japan by Pony Canyon.
- 2003 — The Legends of the Microns episode "聖剣 (つるぎ) - swoop" premieres in Japan.
- 2005 — Universal/Right releases Transformers: Armada—Vol: 03 on VHS and DVD in the UK... a year and a half after the previous volume's release.
- 2006 — Skydance Media is founded.
- 2009 — The Animated episode "Five Servos of Doom" premieres in the US.
- 2009 — The Transformers Animated episode "A Bridge Too Close, Part I" premieres in Italy.
- 2012 — How to Draw Transformers Prime is released by IDW Publishing.
- 2013 — The Transformers: Rescue Bots episode "The Reign of Morocco" premieres in Brazil.
- 2015 — The Robots in Disguise episode "Trust Exercises" premieres on Cartoon Network in the USA.
- 2018 — Transformers: The Definitive G1 Collection: Volume 3: Dinobot Hunt is released by Hachette Partworks.
- 2019 — Bumblebee's First Life on Earth #2 is released.
- 2020 — The Rescue Bots Academy episodes "Robo-Cody" and "Heatwave's Shiny Coat" premiere on Discovery Family.
- 2023 — Hasbro Pulse hosts a fan first stream revealing the third wave as well as the commander and titan class figures of Transformers:Legacy Evolution and pre-orders for that third wave go up.
- 2024 — Final day to preorder the Threezero DLX The Last Knight Nemesis Prime.
- 2024 — Preorders for the 2nd Studio Series wave of the year go up.
- 2025 — Preorders for the MPG-17 Optimus Prime Style Gen. go up.
- 2026 — The Cyberworld episode "What Lies Beneath" premieres on YouTube.
- 2026 — Marcel Guido (French voice of Megatron/Galvatron in The Transformers: The Movie) passes away at the age of 84.
- 1941 — Hans-Werner Bussinger (German voice of John Keller) is born.
- 1952 — Actor Mitch Pileggi (TRF Group Leader in Transformers: The Last Knight) is born.
- 1957 — Andreas Borcherding (German voice of Sideswipe) is born.
- 1970 — Milton Parisi (Brazillian voice of Sherman and Soundwave in the War for Cybertron Trilogy) is born.
- 1972 — Junko Takeuchi (Japanese voice of Moon and Break) is born. Believe it.
- 1977 — Daniele Raffaeli (Italian voice of Aron, Drag Strip, Skydive in the Generation One re-dub and War for Cybertron Trilogy Bumblebee) is born.
- 1983 — IDW Publishing colorist Andrew Elder is born.
- 1994 — Amanda Manso (Brazilian voice of Charlie Watson in Bumblebee and Chromia in War for Cybertron Trilogy) is born.
- 2000 — The Beast Machines episode "Sparkwar Pt. III: The Siege" premieres in Canada on YTV.
- 2000 — Car Robots premieres in Japan with the episode "First Deployment! Fire Convoy".
- 2003 — The Armada episode "Past II" premieres in the US.
- 2004 — The Transformers—Bumper Collection Special is released on DVD in the UK by Metrodome.
- 2006 — Transformers, Beast Wars: The Gathering #3 is released in the US by IDW Publishing.
- 2008 — The Transformers Animated episode "Megatron Rising - Part 2" premieres in the US.
- 2013 — The Transformers: Prime episode "Prey" premieres on The Hub.
- 2014 — The Rescue Bots episode "Prescott's Bots" premieres on Hub Network.
- 2015 — The Robots in Disguise episode "More than Meets the Eye" premieres in Japan.
- 2017 — Revolution: Aw Yeah! #1 is released by IDW Publishing.
- 2017 — Transformers: The Definitive G1 Collection: Volume 39: Hearts of Steel is released by Hachette Partworks.
- 2017 — The Transformers: Forged to Fight mobile game is released.
- 2020 — The Transformers: Cyberverse episodes "The Trial" and "The Prisoner" premiere in the US.
- 19?? — Prime prop designer Christie Tseng is born.
- 19?? — Michael Schwalbe (voice of Doubledealer in War for Cybertron Trilogy) is born.
- 19?? — Wahyu Gita Murti (Indonesian voice of Kikmee) is born.
- 1967 — Kathleen Barr (voice of Botanica) calls everybody "Dorks" after she was born.
- 1969 — Jamie McBride ("FBI Agent" in Transformers) is born.
- 1970 — Bruno Henry (European French voice of Robert Epps) is born.
- 1975 — Brook Chalmers (voice of Transformers: War for Cybertron Trilogy Impactor) is born.
- 1978 — Erica Edwards (Mexican voice of Arcee, Elita-One, Airachnid, Amber and Breanna Díaz) is born.
- 2001 — High Moon Studios is founded.
- 2005 — Extremely Funny Transformers Gag Colosseum is published in Japan by Kodansha.
- 2007 — The Transformers Collectors' Club members-only site releases an online sneak preview of the bios for the Mini-Cons Divebomb and Snarl.
- 2011 — Infestation #2 and the Transformers: Sector 7 TPB are released by IDW Publishing.
- 2012 — Transformers Prime — Folge 1: "Die dunkle Macht erhebt sich" and "Folge 2: Meister und Schüler" are released to home media by EDEL:kids in Germany.
- 2015 — "Hibachi Chef" is uploaded to the Transformers YouTube page.
- 2021 — Hasbro Pulse Fan Fest 2021 is held.
- 2022 — The IDW Collection Phase Three: Volume 2 is released by IDW Publishing.
- 2023 — TakaraTomy officially reveals the Beast Wars: Super Lifeform Transformers Again BWVS-02 Tough Showdown: Rhinox VS Scorpos set.
- 2024 — The Transformers: EarthSpark episodes "A Stygi Situation" and "Disarmed" premiere on Nickelodeon in the U.S.
- 1964 — Guillaume Orsat (French voice of Megatron, Red Alert, and more in the Unicron Trilogy and European French voice of Drift in the live-action film series) is born.
- 1973 — Jacek Król (Polish voice of Skyquake, Dreadwing, Drift, Hammerstrike, Galvatronus and One Alpha Trion) is born.
- 1974 — Illustrator Tom Whalen is born.
- 1981 — Thiago Fagundes (Brazillian voice of War For Cybertron Trilogy Rattrap and Thrash) is born.
- 1983 — Sam's Club is first opened in Midwest City, Oklahoma.
- 1987 — Jeane Marie (Brazilian voice of Bumblebee Arcee and War For Cybertron Trilogy Moonracer) is born.
- 1989 — The original Transformers Cartoon makes its debut on german televions with the episode Nightmare Planet.
- 1991 — The Super-God Masterforce episode "The True Face of Z, the Ultimate Killer" premieres in Malaysia.
- 1993 — Hernán Tracchia (Argentinian voice of Spike Witwicky) is born.
- 1999 — The Beast Wars Neo episode "Waa! They Got Eaten" premieres in Japan.
- 1999 — The Beast Wars cartoon premieres in France with "Beast Wars (Part 1)".
- 2004 — The Melbourne House-developed Transformers PlayStation 2 game is released in the UK by Atari, Inc.
- 2004 — Dreamwave releases More than Meets the Eye: Transformers: Armada volume 2.
- 2005 — Energon—Volume 1: Battle for Energon is released on VHS and DVD in Australia by Paramount Pictures.
- 2010 — Director Tom Ray dies in Virginia.
- 2012 — The Transformers: Prime episode "Nemesis Prime" premieres on The Hub.
- 2012 — The Super Robot Lifeform Transformers: Prime episode "Perfect Transformation! Enter the Transformers" premieres in Japan on TV Aichi.
- 2015 — The Robots in Disguise episode "Trust Exercises" premieres in Brazil.
- 2015 — The second BotCon 2015 box set exclusive Battletrap is revealed.
- 2016 — First day of BotCon 2016 in Louisville, Kentucky.
- 2021 — Transformers: Beast Wars #3 is released by IDW Publishing.
- 2023 — The Transformers: EarthSpark episodes Age of Evolution, Part 1 and "Age of Evolution, Part 2" premiere on YTV in Canada.
- 2023 — Javier Rodríguez (Chilean voice of Ratchet) passes away at age 65.
- 2024 — The Transformers: EarthSpark episode "Bumblebee!" premieres in Japan.
- 2026 — A closed beta for the Transformers: Eternal War Mobile Game concludes in Australia, New Zealand, Singapore & the Philippines.
- 1964 — Writer and producer Steven DeKnight is born.
- 1967 — Kazunari Tanaka (Japanese voice of Cybertron Thundercracker) is born.
- 1968 — Sérgio Moreno (Brazilian voice of Blurr, Inferno and War for Cybertron Trilogy Dinobot) is born.
- 1976 — Hiroki Shimowada (Japanese voice of Scalpel) is born.
- 1978 — Klaudiusz Kaufmann (Polish voice of Blades and Grimlock) is born.
- 1979 — Actor B. Adam Baillio (Timothy in Age of Extinction) is born.
- 1989 — The Victory OP/ED single "Transformer V"/"Cybertron Banzai" is released in Japan by Columbia Music Entertainment.
- 1993 — Cadu Ramos (Brazilian voice of Repugnus and Doublecrosser) is born.
- 1998 — The Beast Wars II episode "White Lion, Run!" premieres in Japan.
- 2006 — The Cybertron episode, uh, "Cybertron", premieres in the US.
- 2009 — The Arrival TPB, Defiance #4 and "Spotlight: Drift" are released by IDW Publishing.
- 2015 — More than Meets the Eye #39, Transformers vs. G.I. Joe #6 and The Transformers Vol 7 — Combiner Wars: First Strike TPB are released by IDW Publishing.
- 2016 — Second day of BotCon 2016 in Louisville, Kentucky.
- 2020 — First day of preorders on TakaraTomy Mall for Generations Selects Super Megatron
- 2020 — The Generations Selects Special Comic Super Megatron comic 2 is first published.
- 2021 — The Generations Selects Special Comic Finale is first published.
- 2022 — Warner Bros. Discovery is formed.
- 2023 — The EarthSpark episode "Secret Legacy, Part 2" premieres in Cantonese.
- 2024 — Transformers: Beast Awakening premieres on Star Channel in Japan.
- 2025 — Skybound Entertainment launches a Kickstarter to produce a hardcover release of The Transformers Compendium, which meets its funding goal in 2 minutes.
- 2026 — Transformers #31 is released by Image Comics and Skybound Entertainment.
- 2026 — TakaraTomy uploads the "Business Trip! Wild King Research Institute - Episode 10 -" to YouTube.
- 1959 — Sheila Dorfman (Brazilian voice of Judy Witwicky) is born.
- 1962 — Stefan Berglund (Swedish voice of Bulkhead, Crosswise, Landmine, Red Alert and Scorponok) is born.
- 1990 — Morgana Bernabucci (Brazilian voice of Arcee) is born.
- 1991 — Amber Lee Connors (voice of Windblade in Transformers: Tactical Arena) is born.
- 2003 — Armada #10 is released by Dreamwave Productions.
- 2004 — Horrifying Energon marathon! Four new episodes premiere in the US: "Starscream the Mysterious Mercenary", "Battle of the Asteroid Belt", "Energon Tower", and "The Legend of Rodimus".
- 2004 — One-fourth less horrifying! The Super Link episode "Energon Grid Engaged" premieres in Japan.
- 2005 — Jacques Ferrière (European French voice of Starscream, Grimlock, Hound, Sparkplug Witwicky and various others in the original cartoon) dies aged 72.
- 2008 — Best of UK: Space Pirates #2 and "Focus on: Decepticons!" are released by IDW Publishing.
- 2009 — Armada — Volume Two is released on DVD in Germany by New KSM.
- 2011 — The Transformers: Prime episode "Speed Metal" premieres on The Hub.
- 2012 — Takeshi Aono (voice of Deathsaurus) dies of an aortic aneurysm at age 75.
- 2012 — The Transformers: Prime episode "One Shall Fall" premieres in Brazil.
- 2013 — The Transformers: Rescue Bots episode "Small Blessings" premieres in Brazil.
- 2016 — Third day of BotCon 2016 in Louisville, Kentucky.
- 2016 — The Robots in Disguise episode "Portals" premieres on Cartoon Network UK, while "Bumblebee's Night Off" premieres on Cartoon Network USA.
- 2019 — Bumblebee is released on DVD in Brazil.
- 2021 — The Hasbro Pulse Fan Fest 2021 virtual convention goes live on YouTube, with a Transformers panel to unveil concept art for the final chapter of the War for Cybertron Trilogy cartoon, IDW Publishing's Shattered Glass comic, and Generations toys.
- 2021 — Rapper DMX passes away at age 50.
- 2023 — The Beast Wars Again episode "Enter the Super Lifeform Transformers!! (Part 2)" airs on TV Tokyo.
- 2023 — Final day of the Rise of the Beasts Optimus Prime & Optimus Primal World Tour in Madrid, Spain.
- 2024 — On this Transformers Tuesday reissues for the Studio Series Gamer Edition Optimus Prime and Earthrise Optimus Prime go up for pre-order.
- 2025 — Transformers #19 is released by Image Comics and Skybound Entertainment.
- 2025 — The Wild King episode "The Hero Who Descends from the Sky!" premieres on the TakaraTomy YouTube channel.
- ???? — Marco Viloria (Mexican voice of Mandroid) is born.
- 1937 — Hans Teuscher (German voice of Theater Landlord) is born.
- 1948 — Angelo Nicotra (Italian voice of Generation 1 Galvatron, Blaster and also Ratchet and General Whalen) is born.
- 1950 — Transformers: Beast Awakening brand ambassador Akiko Wada is born.
- 1958 — François Berland (French voice of Optimus Prime in EarthSpark) is born.
- 1959 — Yukiyoshi Ōhashi (writer for the Beast Wars II, Beast Wars Neo and Car Robots cartoons) is born.
- 1960 — Fátima Noya (Brazilian voice of Beast Wars Blackarachnia and Rescue Bots Anna Baranova) is born.
- 1960 — Cecília Lemes (Brazilian voice of June Darby and D. Greene) is born.
- 1961 — Composer Silvio Amato is born.
- 1961 — James Taylor (director of the Beast Machines episode "Revelations Part I: Discovery") is born.
- 1963 — Musician Kal Swan is born.
- 1967 — Comic editor David Wohl is born.
- 1968 — Marcelo Coutinho (Brazilian voice of Slipstream) is born.
- 1973 — Singer Jun Yoneya is born.
- 1977 — Voice actress & Cybertron episode writer Stephanie Sheh is born to punish you in the name of the Moon.
- 1981 — Perla Liberatori (Italian voice of Misha Miramond) is born.
- 1998 — Hitomi Arae of the Tokyo Girls' Style idol group is born.
- 1998 — Lorenzo Crisci (Italian voice of Nightshade) is born.
- 1998 — The Beast Wars series premieres in the United Kingdom.
- 2006 — The second show in the Kiss Players radio drama series airs in Japan on the "Lyrian Moe-tchao" program.
- 2006 — Cybertron — A New Beginning is released on DVD in the UK by Paramount Pictures.
- 2010 — The Animated episode "The Heroes Are Called Autobots" debuts in Japan.
- 2013 — Regeneration One #90 is released by IDW Publishing.
- 2016 — Fourth and final day of BotCon 2016 in Louisville, Kentucky.
- 2016 — The Robots in Disguise episode "Graduation Exercises" premieres on Cartoon Network UK.
- 2023 — Final day of the Rise of the Beasts Optimus Prime & Optimus Primal World Tour in Singapore.
- 2023 — Street date for the Rise of the Beasts toyline.
- 2024 — Transformers #7 is released by Image Comics and Skybound Entertainment.
- 2024 — TakaraTomy officially reveals Transformers Masterpiece MP-60 Ginrai & MPG-9 Super Ginrai
- 2024 —The Transformers Night episode of The Masked Singer premieres on Fox.
- 2025 — Preorders for the Premium Collectibles Studios Museum Scale Unicron Statue go up.
- 1898 — Following the sinking of the USS Maine after a mysterious explosion on February 15th, the Spanish-American War begins.
- 1943 — Michihiro Ikemizu (Japanese voice of Sixshot, Greatshot, Edmund Burton and others) is born.
- 1946 — Laurie Faso (voice of Orion Pax, Skydive, Divebomb and others in the original The Transformers cartoon) is born.
- 1953 — Shingo Hiromori (voice of Galaxy Shuttle and Laster) is born.
- 1956 — Martine Reigner (French voice of Miranda Jones) is born.
- 1960 — Shōko Kanoki (Japanese voice of Harding) is born.
- 1973 — Waldemar Barwiński (Polish voice of Vertebreak, Clawtrap, Mandroid, Wheeljack, Shockwave, Breakdown and more) is born.
- 1975 — Daniel Lobé (European French voice of Hardcore Eddie and Danny Bell) is born.
- 1982 — Renu Sharda (Hindi voice of Arcee in Transformers: War for Cybertron Trilogy) is born.
- 1986 — The Fight! Super Robot Lifeform Transformers episode "The Rebellion of the Triple Changers" premieres in Japan.
- 1988 — Avex Trax is founded.
- 1989 — The Victory episode "Unite!! Multiforce" premieres in Japan.
- 2000 — Eduardo Borja (Mexican voice of Depth Charge and Vok) dies of a diabetes-related stroke at age 60.
- 2003 — The Legends of the Microns episode "強敵 (つわもの) - overmatch" premieres in Japan.
- 2004 — The Melbourne House-developed Transformers PlayStation 2 game is released in the US by Atari, Inc.
- 2007 — Movie Prequel #3 and the Stormbringer manga are released by IDW Publishing.
- 2009 — The Animated episode "Predacons Rising" premieres in the US.
- 2009 — The Transformers Animated episode "A Bridge Too Close, Part II" premiere in Italy.
- 2012 — Autocracy #7 is released online by IDW Publishing.
- 2013 — The Transformers: Rescue Bots episode "The Griffin Rock Triangle" premieres in Brazil.
- 2015 — The Robots in Disguise episode "More than Meets the Eye" premieres on Cartoon Network in the USA. The Rescue Bots episode "Turning the Tide" premieres on Discovery Family.
- 2015 — The Robots in Disguise episode "Trust Exercises" premieres in Germany.
- 2018 — Till All Are One Volume 3 TPB is released by IDW Publishing.
- 2019 — Bumblebee's First Life on Earth #3 is released.
- 2019 — Japanese animation director Osamu Sekita passes away.
- 2022 — Comic Book Resources drops reveal teasers of Legacy wave 2's Wild Rider and Blitzwing a day ahead of the Fan First Tuesday.
- 2024 — Paramount hosts a panel at CinemaCon 2024, showing off the first footage of Transformers One and announcing a Transformers / G.I. Joe crossover film for 2026.
- 1945 — U.S. President Franklin D. Roosevelt dies at age 63.
- 1959 — Alain Zouvi (Canadian French voice of three different Witwickys and Skywarp) is born.
- 1963 — Tsuburaya Productions is founded.
- 1964 — Japanese channel TV Tokyo begins its first broadcast.
- 1972 — Steve Driesen (French voice of Jetfire in the Cyberverse cartoon) is born.
- 1973 — Dreamwave and Devil's Due comic book artist Mark Brooks is born.
- 1973 — Julio Bernal (Mexican voice of Fracture) is born.
- 1975 — French illustrator Jérôme Alquié is born.
- 1988 — The Super-God Masterforce cartoon premieres in Japan with the episode "Rise Up!! Pretenders".
- 1993 — Flora Paulita (Brazilian voice of Sari Sumdac) is born.
- 2000 — The Car Robots episode "High Speed Battle! Gelshark" premieres in Japan.
- 2000 — The Beast Machines episode "Spark of Darkness" premieres in Canada on YTV.
- 2003 — The Armada episode "Sacrifice" premieres in the US.
- 2004 — Beast Wars: Transformers—Vol. 1 is released in the UK on DVD by Universal.
- 2006 — Infiltration issue 4 is released in the US by IDW Publishing.
- 2008 — The Animated episode "The Elite Guard" premieres in the US.
- 2013 — The Transformers: Prime episode "Rebellion" premieres on The Hub.
- 2013 — "Personality Crisis" is first published by Eaglemoss/GE Fabbri in Russia.
- 2014 — The Rescue Bots episode "Blame the Gremlins" premieres on Hub Network.
- 2015 — The Robots in Disguise episode "W.W.O.D.?" premieres in Japan.
- 2020 — Keiji Fujiwara (Japanese voice of Dinobot, Scavenger, Grimlock and both Prime Megatron and Q-Transformers Generation 1 Megatron) passes away due to cancer at age 55.
- 2020 — The Transformers: Cyberverse episodes "The Scientist" and "The Alliance" premiere in the U.S..
- 2022 — Hasbro hosts a Fan First Tuesday livestream officially revealing Legacy wave 2 and Shattered Glass Collection Ultra Magnus.
- 2024 — The Transformers: EarthSpark episode "A Stygi Situation" premieres on YTV in Canada.
- 2024 — IDW cover artist Jeffrey Veregge passes away.
- 1947 — Holger Schwiers (German voice of Dirk Manus, Furg, Scourge, Ultra Magnus and more) is born.
- 1950 — Ron Perlman (English voice of Optimus Primal) is born, and asks where his goddamn shoe is.
- 1952 — Yasuyoshi Hara (Japanese voice of Tom Banachek, Morshower and Devastator) is born.
- 1952 — Zhang Wenyu (Chinese voice of Optimus Primal in Beast Wars) is born.
- 1952 — Achille Orsoni (French voice of Thundercracker in the War for Cybertron videogame) is born.
- 1953 — Ricardo Schnetzer (Brazilian voice of Grapple, Blaster, Cosmos, Nosecone, Leadfoot and War for Cybertron Trilogy Scorponok) is born.
- 1953 — Esther Scott (Glen's grandmama in Transformers) is born.
- 1954 — Writer Michael Cassutt is born.
- 1954 — Michael Bideller (German voice of Wheeljack) is born.
- 1970 — Lalo Capetillo (Mexican voice of D-16/Megatron in Transformers One) is born.
- 1973 — Tanja Schmitz (German voice of Sari Sumdac) is born.
- 1974 — Gwangju Jeon (Korean voice of Hot Shot and Backstop) is born.
- 1977 — Makoto Ueki (voice of Colada) is born.
- 1977 — Tero Koponen (Finnish voice of Starscream, Nemesis, Bombshock, Blurr, Sentinel Prime and more) is born.
- 1981 — Daniel Lacy (Mexican voice of Manny) is born.
- 1988 — Liu Beichen (Chinese voice of Prime Shockwave and Agent Fowler) is born.
- 1990 — Igor Lott (Brazilian voice of Jetfire) is born.
- 2009 — A six-minute preview of the Animated episode "Human Error, Part I" debuts on Cartoon Network's website.
- 2011 — The Transformers #18 and Transformers: Rising Storm #3 are released by IDW Publishing.
- 2011 — Voting begins for the fans' choice entry in the 2011 Transformers Hall of Fame.
- 2014 — Peter Heusch (German voice of Starscream) dies at the age of 76.
- 2015 — Comic artist Herb Trimpe dies at age 75.
- 2016 — The Robots in Disguise TPB is released by IDW Publishing.
- 2018 — Thomas Petruo (German voice of Paralon) dies at age 61.
- 2024 — The Transformers: EarthSpark episodes "What Dwells Within" and "Prime Time" premiere on Nickelodeon in the U.S.
- 2026 — Screenrant.com officially reveals the Studio Series AOE Bumblebee, One Soundwave, One Thundercracker, Evasion Mode Optimus Prime and the Age of the Primes Armada Jetfire (w/ Astroscope, Payload and Sky Blast.
- 19?? — Kaitlin Becker (voice of Frankie Greene in Rescue Bots Academy) is born.
- 1937 — Miroslav Bijelić (Serbian voice of Soundwave) is born.
- 1949 — Comic artist Dave Gibbons is born.
- 1954 — Comic writer Chuck Dixon is born.
- 1956 — Chris Ellis (Admiral Brigham in Transformers) is born.
- 1958 — Pasquale Anselmo (Italian voice of Armada Red Alert and The Last Knight Hot Rod) is born.
- 1960 — Brad Garrett (voice of Generation 1 Trypticon) is born. Everybody Loves Trypticon.
- 1971 — Damien Boisseau (European French voice of Dylan Gould) is born.
- 1971 — Kim Kwang-kuk (Korean voice of Clampdown) is born.
- 1975 — Marika Hayashi (Japanese dub voice of Maggie Madsen and Darcy Tirrel) is born.
- 1975 — Musician Takayoshi Tanimoto is born.
- 1982 — Paolla Oliveira (Brazilian voice of Shatter) is born.
- 1984 — Hyeon Lee (Korean voice of Predaking, Prime Alpha Trion, Vehicon, Chase, Mandroid and D-16/Megatron) is born.
- 1987 — Fidel Garriga (Mexican voice of Jawbreaker and Transformers: War for Cybertron Trilogy Soundwave) is born.
- 1989 — The Transformers episode "The Return of Optimus Prime, Part 1" premiers in Germany.
- 1991 — The Super-God Masterforce episode "The Ultimate Battle" premieres in Malaysia.
- 1999 — The Beast Wars Neo episode "Planet of Time" premieres in Japan.
- 2004 — War Within: The Dark Ages #6 is released in the US by Dreamwave Productions.
- 2005 — Takara releases Galaxy Force GC-15 Saidos and GD-10 Terashaver.
- 2009 — A five-page preview of the Wings of Honor comic book is revealed at BotCon.com.
- 2010 — Nefarious #2 and the Tales of the Fallen TPB are released in the US by IDW Publishing.
- 2012 — The Prime episode "Grill" and Rescue Bots episode "Four Bots and a Baby" premiere on The Hub.
- 2012 — The Super Robot Lifeform Transformers: Prime episode "Dark Transformation! Dark Energon" premiers in Japan on TV Aichi.
- 2015 — The Robots in Disguise episode "More than Meets the Eye" premieres in Brazil.
- 2022 — e-HOBBY releases the third wave of Transformers Character Card.
- 2023 — The entire complete series of Beast Wars becomes avaliable for digital purchase on iTunes.
- 2024 — The Transformers: EarthSpark episode "Run! Breakdown" premieres in Japan.
- 2026 — Preorders for the Studio Series AOE Bumblebee, One Soundwave, One Thundercracker, Evasion Mode Optimus Prime and the Age of the Primes Armada Jetfire (w/ Astroscope, Payload and Sky Blast) go up.
- 1912 — The Titanic sinks; there are over 1,500 casualties.
- 1955 — Olivier Destrez (first European French voice of Spike Witwicky and Cliffjumper in the original cartoon, but also the voice of Cyclonus, Demolishor, Vector Prime and many others in the Unicron Trilogy) is born.
- 1955 — Ray Kroc opens his very first McDonald's restaurant in Des Plaines, Illinois.
- 1965 — Composer Koichi Namiki is born.
- 1971 — Actor Andrew Daly (Donnie in Transformers: Dark of the Moon) is born.
- 1978 — Takashi Watanabe (Japanese voice of Guard) is born.
- 1993 — André Raimundo (Portuguese voice of Dave the Security Guard, 24K-Bit and Thrash Malto) is born.
- 1996 — Keita Tada (voice of Optimus Prime) is born.
- 1998 — The Beast Wars II episode "Bighorn's Rage" premieres in Japan.
- 2005 — Transformers: Robots in Disguise—Part 2 of 2 is released on DVD in the UK by Maximum Entertainment.
- 2005 — "Deep Sea Discovery! Vector Prime" is serialized by Comic BomBom in their May 2005 issue.
- 2006 — The Cybertron episode "Balance" premieres in the US.
- 2009 — All Hail Megatron #10 and Maximum Dinobots #5 are released by IDW Publishing.
- 2009 — The Henkei! Henkei! Transformers manga chapter "Time of Resurrection" is serialized in Japan in Comic BunBun's May 2009 issue.
- 2015 — The Transformers vol.2 #40 — Combiner Wars part 2 and The Transformers: Spotlight Omnibus Volume 1 TPB are released by IDW Publishing.
- 2016 — The album "Transformers Roll Out" is released by Hasbro Studios and Sony Music Entertainment.
- 2021 — Dario de Castro (Brazilian voice of Prowl, Smokescreen, Predaking, Obsidian, Theodore Galloway, Daytrader and more) dies at age 72.
- 2023 — TakaraTomy releases the first wave of Beast Awakening toys. The associated "Burning Plasma Blaster Present Campaign" begins as well: the Burning Plasma Blaster toy is given away free with the purchase of 5000 yen worth of Beast Awakening toys in stores across Japan.
- 2023 — The EarthSpark episode "Moo-ving In" premieres in Cantonese.
- 2023 — Transformers Go! Go! #23 is published.
- 2023 — Gileno Santoro (Brazilian voice of Yoketron and the small Colossus Rhodes) dies at the age of 74.
- 2024 — Transformers Go! Go! #37 is published.
- 2025 — Hasbro officially reveals the Supreme × Transformers Optimus Prime Collaboration.
- 2025 — Ken Shiroyama (Japanese voice of Fight! Super Robot Lifeform Transformers 2010 cartoon Bombshell, Fireflight, Perceptor, and many more), passes away at age 92.
- 2026 — G.I. Joe #21 is released by Image Comics and Skybound Entertainment.
- 2026 — TakaraTomy uploads the "Business Trip! Wild King Research Institute - Episode 11 -" to YouTube.
- ???? — Pascual Meza (Mexican voice of Burgertron and Seymour Simmons) is born.
- 1930 — Francis Lax (European French voice of Optimus Prime, Bumblebee, Ironhide and many others in the original cartoon) is born.
- 1937 — Francette Vernillat (European French voice of Daniel in a pair of episodes of The Transformers) is born.
- 1949 — Tomasz Marzecki (Polish voice of Energon Unicron, Scorponok, Skyblast, Brakedown, Metroplex and Colonel Franklin) is born.
- 1952 — Voice actor Billy West (voice of the Red M&M) is born.
- 1955 — Comic artist Kim DeMulder is born.
- 1975 — Sébastien Hébrant (French voice of Hoist in Rescue Bots Academy) is born.
- 1979 — Dirk Stollberg (German voice of Frat guys and Vernon) is born.
- 1986 — Betzabé Jara (Mexican voice of Chromia, Frenzy, Spitfire, Batsby and Elita-1) is born.
- 1993 — Filipe Albuquerque (Brazilian voice of Cog) is born.
- 1999 — Regis Cordic (voice of Generation 1 Menasor and various Quintessons) dies of cancer at the age of 72.
- 2003 — War and Peace #1 is released in the US by Dreamwave Productions.
- 2004 — The Super Link episode "Enemy? Ally? Rodimus Convoy" airs in Japan.
- 2004 — Transformers: Energon makes its Canadian television broadcast premiere on YTV airing the first three episodes Cybertron City, Energon Stars, and Scorpinok.
- 2005 — The Galaxy Force episode "Bud and Hop's Trip to the City" airs in Japan.
- 2011 — The Transformers: Prime episode "Predatory" premieres on The Hub.
- 2012 — Pre-order window opens for United Artfire with Nightstick and Sparks.
- 2012 — The Prime episode "One Shall Rise, Part 1" premieres in Brazil.
- 2012 — Transformers: Revenge of the Fallen makes its premiere on the Brazilian tv channel Globo.
- 2014 — The Transformers: Windblade #1 and Dark Cybertron Vol 1 TPB are released by IDW Publishing.
- 2015 — The third BotCon 2015 box set exclusive Stepper is revealed.
- 2016 — The Robots in Disguise episodes "Decepticon Island (Part 1)" and "Decepticon Island (Part 2)" premiere on Cartoon Network UK, while "Impounded" premieres on Cartoon Network USA.
- 2019 — The Generations Selects Special Comic Star Convoy comic is first published.
- 2023 — The Beast Wars Again episode "Defeat the Destrons" airs on TV Tokyo.
- 2023 — Final day of the Rise of the Beasts Optimus Prime & Optimus Primal World Tour in São Paulo, Brazil.
- 2024 — On this Transformers Tuesday reissues for the Generations Selects WFC-GS17 Shattered Glass Optimus Prime & Shattered Glass Ratchet and Siege WFC-S28 Jetfire go up for preorder.
- ???? — Hiroaki Okuda (Japanese voice of Ransack) is born.
- ???? — Japanese voice actress Aino Shimada is born.
- 1924 — Artist Earl Norem is born.
- 1942 — Helga Sasse (German voice of Tova Anael Fischer) is born.
- 1954 — Norio Imamura (Japanese voice of Gaskunk) is born.
- 1956 — Han Li (Chinese voice of Megatron and voice director of Beast Wars and Beast Machines) is born.
- 1962 — Ola Norman (Swedish voice of Hot Shot) is born.
- 1967 — Takaya Kuroda (Japanese voice of Cybertron Starscream) is born.
- 1967 — Sławomir Pacek (Polish voice of Optimus Prime in the live-action film series since Age of Extinction) is born.
- 1973 — Renato Soares (Brazilian voice of Meltdown and Boulder) is born.
- 1975 — Sepuh Apikian (Armenian voice of Optimus Prime and more) is born.
- 1976 — Monet Mazur (voice of Astraea) is born.
- 1987 — The Fight! Super Robot Lifeform Transformers 2010 episode "The Quintessons, the Merchants of Death" airs in Japan.
- 1988 — Rodrigo Contreras (Chilean voice of Wasp) is born.
- 1991 — Tiana Camacho (voice of EarthSpark Frenzy) is born.
- 2006 — The third show in the Kiss Players radio drama series airs in Japan on the "Lyrian Moe-tchao" program.
- 2008 — "Force of Habit" is released through the Fun Publications Official Transformers Collectors' Club website.
- 2010 — The Animated episode "Secret of the AllSpark" debuts in Japan.
- 2013 — Robots in Disguise #16 and Volume 3 TPB are released by IDW Publishing.
- 2016 — The Robots in Disguise episodes "Cover Me" and "Brainpower" premieres in France.
- 2019 — Transformers #3 is released by IDW Publishing.
- 2019 — Transformers: The Definitive G1 Collection Volume 48: Revenge of the Decepticons is released by Hachette Partworks.
- 2021 — TakaraTomy releases Generations Selects Abominus as a TakaraTomy Mall exclusive.
- 2021 — The Rescue Bots Academy episodes "Medix Gets Schooled" and "Rescue TEENS" premieres in the United States.
- 2024 — Cobra Commander #4 is released by Image Comics and Skybound Entertainment.
- 2025 — The Supreme x Transformers Optimus Prime Collaboration goes up for sale.
- 2025 — The first wave of the Transformers: Cyberworld toyline go up for preorder.
- 2025 — The Transformers Earthspark Smash Changers Jawbreaker and Twitch are revealed by Amazon.
- 2025 — Henry König (German voice of Tigatron) dies at age 88.
- 1917 — Animator Warren Batchelder is born in Los Angeles.
- 1930 — Clive Revill (voice of the original The Transformers cartoon Kickback) is born.
- 1938 — The first publication date of the debut of Superman.
- 1956 — Rosa Maria Baroli (Brazilian voice of Airazor) is born.
- 1960 — Mariângela Cantú (Brazilian voice of Charlotte Mearing) is born.
- 1972 — Transformers: Prime writer David Slack is born.
- 1974 — Katja Sirkiä (Finnish voice of Strongarm) is born.
- 1974 — Writer Cavan Scott is born.
- 1975 — Martin Spinhayer (French voice of Megatronus and more in Robots in Disguise 2015) is born.
- 1975 — Jeong Jae-heon (Korean voice of Bumblebee in Bumblebee) is born.
- 1977 — Bryce Johnson (Theodore Galloway in Revenge of the Fallen: The Game) is born.
- 1979 — Nando Sierpe (Brazilian voice of Alex Malto and Sky Lynx) is born.
- 1982 — César Garduza (Mexican voice of Danny Bell, Croaton, Blurr and Scrapface) is born.
- 1986 — The Fight! Super Robot Lifeform Transformers episode "Children Play" premieres in Japan.
- 1987 — Actress and model Rosie Huntington-Whiteley (Carly Spencer in Dark of the Moon) is born in England.
- 1989 — The Victory episode "Move Out! Rescue Team" premieres in Japan.
- 1994 — Ana Elena Bittencourt (Brazilian voice of Tina Lark) is born.
- 2001 — Transformers: Car Robots—Vol. 9 and Transformers: Car Robots—Vol. 10 are released on VHS in Japan by Pony Canyon.
- 2003 — The Legends of the Microns episode "疾風 (はやて) - gale" premieres in Japan.
- 2007 — The Transformers: Target: 2006 #1 is released by IDW Publishing.
- 2009 — The Transformers Animated episode "Human Error, Part I" premieres in the US.
- 2012 — The Transformers: More than Meets the Eye #4 and The Transformers Classics, Vol. 3 are released by IDW Publishing.
- 2013 — Hasbro puts up the first of two online polls in the "Fan-Built Bot" program that would ultimately produce Windblade.
- 2013 — A ceremony at the China National Convention Center launches the Transformers 4 Chinese Actors Talent Search Reality Show.
- 2015 — The Robots in Disguise episode "W.W.O.D.?" premieres on Cartoon Network in the USA.
- 2015 — The Rescue Bots episode "The Last of Morocco" premieres on Discovery Family.
- 2015 — The Robots in Disguise episode "More than Meets the Eye" premieres in Germany.
- 2018 — Optimus Prime #17, #18 and Lost Light #17 are released by IDW Publishing.
- 2018 — Transformers: The Definitive G1 Collection: Volume 23: Destiny is released by Hachette Partworks.
- 2019 — Alfonso Ramírez (Mexican voice of Dinobot II, Beast Machines Optimus Primal, Boulder and Optimus Prime) dies at age 72.
- 2020 — The Rescue Bots Academy episodes "Acting Out" and "Need to Know" premiere on Discovery Family.
- 2023 — Pre-orders go up for the Transformers: Legacy Evolution Armada Universe Optimus Prime.
- 2024 — The first trailer for Transformers One premieres via a livestream of a small screen hovering 38 km above the Earth. Yes, really.
- 2024 — The Transformers One toyline is also officially revealed and preorders for it go up.
- 2025 — Transformers: Rise of the Beasts makes its Canadian television broadcast premiere on CTV2.
- 2026 — The Cyberworld episode "Waves of Guilt" premieres on YouTube.
- 1940 — Francisco José (Brazilian voice of Blades, Blast Off, Skywarp, Beast Machines Megatron and others) is born.
- 1946 — Tim Curry (Doctor Morocco on Rescue Bots) is born. He knows because he was there.
- 1961 — Animator Peter Chung is born in Seoul, South Korea.
- 1968 — Olivier Cordina (European French voice of James Savoy) is born.
- 1970 — Lee Sang-heon (Korean voice of Starscream, Wreck-Gar, Mixmaster, Master Disaster, Ironhide and Skywarp) is born.
- 1978 — Gō Inoue (voice of Q-Transformers Prowl) is born.
- 1988 — The Super-God Masterforce episode "Terror! The Decepticons' Manhunt" premieres in Japan.
- 1992 — João Vieira (Brazilian voice of Whirl) is born.
- 2000 — The Car Robots episode "Unite! Bullet Train Robo" premieres in Japan.
- 2000 — The Beast Machines episode "Endgame Pt. I: The Downward Spiral" premieres in Canada on YTV.
- 2003 — The Armada episode "Regeneration" premieres in the US.
- 2006 — The Art of War #2 is released in the US by Devil's Due Press. Generations #2 is released by IDW Publishing.
- 2008 — The Transformers Animated episode "The Return of the Headmaster" premieres in Canada.
- 2014 — The Rescue Bots episode "Feed the Beast" premieres on Hub Network.
- 2015 — The Robots in Disguise episode "As the Kospego Commands!" premieres in Japan.
- 2017 — G.I. Joe #4 is released by IDW Publishing.
- 2017 — Transformers: The Definitive G1 Collection: Volume 10: Trial by Fire is released by Hachette Partworks.
- 2019 — Klaus Sonnenschein (German voice of Transformers: Age of Extinction Hound) dies at age 84.
- 2020 — The Transformers: Cyberverse episode "The Judge" premieres in the U.S.
- 2021 — Carlos Marques (Brazilian voice of Bombshell, Auggie Cahnay, Slapper and others) dies at age 88.
- 2021 — The "Nemesis Prime and Goldfire Bumblebee" pack and Cube Arcade Mode Add-on are available to purchase separately for Transformers: Battlegrounds.
- 2022 — Hasbro officially reveals Transformers: Legacy Titan Class Cybertron Universe Metroplex.
- 2023 — Sylvain Lemarié (French voice of various characters including Ratchet and Starscream in Animated and Zeta Prime in the War for Cybertron game) passes away.
- 2024 — Hasbro China officially reveals Masterpiece Movie Series MPM-15 Decepticon Brawl.
- 2024 — The Transformers: EarthSpark episode "Disarmed" premieres on YTV in Canada.
- 1930 — Pierre Hatet (French voice of Springer and Kranix in The Transformers: The Movie) is born.
- 1937 — George Takei (voice of Yoketron and Prime Alpha Trion) is born. Oooohhhh my.
- 1951 — Nada Blam (Serbian voice of Spike, Ratchet and Skywarp) is born.
- 1959 — Leonardo Araujo (Latin American Spanish voice of Blaster, Chip Chase and Kup) is born.
- 1964 — Juan Guzmán (Latin-American voice of Fred, Wheeljack, Nemesis Prime, Brian Jones, Bruticus Maximus, Evac and Scattorshot) is born.
- 1971 — Writer Eric S. Calderon is born.
- 1971 — Won-jun Lee (Korean voice of Crazybolt, Dead End, Hydra, Randy, and Survive) is born.
- 1973 — Seung-cheol Baek (Korean voice of Jazz and Sideswipe) is born.
- 1975 — Comic artist Chia-Chi Wang is born in Taiwan.
- 1977 — Justin Ponsor is born.
- 1978 — Rodrigo Saavedra (Chilean voice of Random Blitzwing) is born.
- 1990 — Danann Huicochea (Latin-American Spanish voice of Arcee in the Bumblebee film and Bonz-Eye in Transformers: BotBots) is born.
- 1999 — Elán Garfias (voice of Cody Burns) is born.
- 2003 — Johnny Douglas (musical composer for the original The Transformers cartoon) dies of prostate cancer.
- 2003 — Transformers: The Battle of the Star Gate issue #1 is first published in Super Robot Magazine #11.
- 2005 — Super Link—Volume 012 is released on DVD in Japan by Interchannel.
- 2007 — The first official previews of Transformers The Game are released.
- 2009 — Model and background designer Romeo Francisco dies.
- 2010 — The Transformers—Seasons Three and Four: 25th Anniversary Edition is released on DVD in the US by Shout! Factory.
- 2011 — Heart of Darkness #2 is released by IDW Publishing.
- 2016 — The Transformers vol.2 #52, Transformers vs. G.I. Joe #12 and the Distant Stars TPB are released by IDW Publishing.
- 2021 — Ana Lúcia Menezes (Brazilian voice of T-AI) dies at age 46.
- 2022 — Hasbro China officially reveals Masterpiece Movie Series MPM-13 Blackout & Scorponok.
- 2022 — Mark Maher hosts a Q&A session with a select group of fans.
- 2022 — Beast Wars Annual is released by IDW Publishing.
- 2024 — The Transformers: EarthSpark episodes "Stowed Away, Stowaways", "The Battle of Witwicky", "The Last Hope, Part 1 and "The Last Hope, Part 2" premiere on Nickelodeon in the U.S.
- 2025 — Illustrator David Schleinkofer dies at age 74.
- 2026 — Transformers One is released on Netflix in Japan.
- 1956 — Carlo Cosolo (Italian voice of Agent Burke, Chief of Staff and voice director of the live-action film series) is born.
- 1963 — Hasbro CEO Brian Goldner is born.
- 1965 — Robert Tondera (Polish voice of H.B. Luskey, Huxley Prescott, Ratchet, Drag Strip, Dropforge, Saberhorn and Vector Prime) is born.
- 1973 — Katsuyuki Konishi (Japanese voice of Super Link Optimus Prime, Cliffjumper, Angry Archer and Spike Witwicky) is born, declaring who the hell do you think he is.
- 1973 — Actor Mark Dexter (The Prime Minister of the United Kingdom in The Last Knight) is born.
- 1979 — Xóchitl Ugarte (Mexican voice of Carly Spencer) is born.
- 1988 — The Super-God Masterforce OP/ED single "Chōjin Masterforce no Theme"/"Moero! Transformer" is released in Japan by Columbia Music Entertainment.
- 1989 — Nintendo releases the original Game Boy in Japan.
- 1989 — The Transformers episode "The Return of Optimus Prime, Part 2" premiers in Germany.
- 1991 — The Victory episode "The Warrior of the Universe, Star Saber" premieres in Malaysia.
- 1994 — Mathieu Touquet (French voice of Bumblebee in Transformers: EarthSpark - Expedition) is born.
- 1999 — The Beast Wars Neo episode "Lonely Hydra" premieres in Japan.
- 1999 — The Beast Wars Neo ED single "Te no Naka no Uchū" is released in Japan by Columbia Music Entertainment.
- 2003 — The Car Robots episode "Final Battle! Fire Convoy" premieres in South Korea on KBS 2TV.
- 2004 — The Transformers—Collection 2: Series 2.1 is released on DVD in Australia by Madman Entertainment.
- 2004 — The Zone OVA "Enter the New Supreme Commander, Dai Atlas!" is released on DVD in Japan by Columbia Music Entertainment.
- 2005 — The Galaxy Force—Sound Pack 1 soundtrack album is released in Japan by Victor Entertainment.
- 2006 — Galaxy Force—Vol. 11 is released on DVD in Japan by Victor Entertainment.
- 2010 — Last Stand of the Wreckers #4 and Spotlight: Prowl are released by IDW Publishing.
- 2010 — The Transformers Animated OP single "TRANSFORMERS EVO." is released in Japan by Lantis.
- 2012 — The Transformers: Prime episode "Armada" and Transformers: Rescue Bots episode "Walk on the Wild Side" premiere on The Hub.
- 2012 — The Super Robot Lifeform Transformers: Prime episode "Rescue Transformation! Fowler in Crisis" premiers in Japan on TV Aichi.
- 2012 — Transformers Generations 2012 is released in Japan, with a mail-away offer for a Voyager-class Artfire toy and the "A Tale of the Pretenders" comic.
- 2014 — The fifth and final BotCon 2014 box set exclusive Ginrai is revealed.
- 2015 — The fourth BotCon 2015 box set exclusive Megatron is revealed.
- 2018 — TakaraTomy releases Movie Masterpiece MPM-5 Barricade.
- 2018 — Waldyr Sant'Anna (Brazilian voice of Underbite) dies at the age of 81.
- 2023 — Jesús Barreda (Castilian Spanish voice of various characters including Hot Shot in the Armada PS2 game and Bumblebee in the War for Cybertron game) passes away and starts a secret mission.
- 2024 — The Transformers: EarthSpark episode "Mother's Day Present" premieres in Japan.
- 2026 — The second wave of the Transformers x NFL figures are revealed and go up for preorder.
- Every year — Earth Day!
- 1943 — Actor Madison Mason (Jeffrey Abrams in Transformers) is born.
- 1954 — Jōji Nakata (voice of Master Megatron from Galaxy Force) is born.
- 1954 — Writer Donald J. Bingle is born.
- 1957 — Yōko Kawanami (voice of Arcee in the Japanese dub of The Transformers: The Movie and "The Headmasters") is born.
- 1961 — Zoltán Tóth (Hungarian voice of Alpha Quintesson and Backstop) is born.
- 1964 — Singer Kōji Kaya is born.
- 1967 — Bernadette Mouzon (French voice of Zizza) is born.
- 1970 — Naomi Matamura (voice of Gōmya and Robots in Disguise (2001) Midnight Express) is born.
- 1972 — Sonia Mazza (Italian voice of Prime Arcee) is born.
- 1972 — Karol Wróblewski (Polish voice of Thunderhoof, Simacore and Heatmark) is born.
- 1980 — Monika Pikuła (Polish voice of June Darby) is born.
- 1981 — Przemysław Stippa (Polish voice of RID2015 Bumblebee, Springload and Prime Minister of the United Kingdom) is born.
- 1982 — Starscream is caught on camera in India. Sector Seven Alternate Reality Game
- 1988 — Deven Mack (voice of Dimlit, Dinger, Frostferatu and Sprinkleberry D'uhnut) is born.
- 1990 — Tony St. James (voice of Brawl, Blot, Cutthroat and Spasma in The Transformers) dies on an operating table due to complications following a perforated ulcer.
- 1996 — Beast Wars premieres in most of the US with "Beast Wars (Part 1)".
- 1997 — Taichi Takeda (Japanese voice of Hound, Astrotrain, Bug Bite and Scorponok in Transformers: War for Cybertron Trilogy) is born.
- 1998 — The Beast Wars II episode "The Lake Trap" premieres in Japan.
- 2003 — The Original Transformers—Season 2 Part 2: Volumes 5-8 are released on DVD in the US by Kid Rhino both individually and as a box set.
- 2004 — Transformers: Energon #22 is released by Dreamwave Productions.
- 2004 — Takara releases Super Link SC-15 Landmine and SD-10 Snowstorm.
- 2005 — Beast Wars Returns—Volume 6 is released in Japan by Geneon Entertainment.
- 2005 — The Transformers: Last Stand HC is released by Titan Books.
- 2008 — The Lockheed F-117 Nighthawk (alt mode of Predator Falcon, Skyjack and several others) is retired from service.
- 2009 — Transformers Animated Volume 8 is released by IDW Publishing.
- 2011 — Final day of voting for the fans' choice entry in the 2011 Transformers Hall of Fame.
- 2011 — The Hyper Hobby magazine exclusive mail-away Animated Black Rodimus toy begins shipping.
- 2014 — To mark Earth Day the alternate mode of Age of Extinction Junkheap was revealed on the official Transformers Facebook page.
- 2015 — The Transformers Classics volume 8 and The Transformers: Windblade #2 — Combiner Wars part 3 are released by IDW Publishing.
- 2020 — Transformers: The Definitive G1 Collection Volume 83: First Strike is released by Hachette Publishing.
- 2023 — e-HOBBY releases the seventh wave of Transformers Character Card.
- 2023 — The EarthSpark episode "House Rules" premieres in Cantonese.
- 2025 — threezero announces the MDLX Red Alert.
- 2025 — The Transformers x NFL figures are revealed and go up for preorder.
- 2026 — Void Rivals #29 is released by Image Comics and Skybound Entertainment.
- 2026 — TakaraTomy uploads the "Business Trip! Wild King Research Institute - Episode 12 -" to YouTube.
- 19?? — Director Vinton Heuck is born.
- 1927 — Michel Barbey (European French voice of Blurr, Sixshot, and sometimes Ultra Magnus in the original cartoon) is born.
- 1930 — Alan Oppenheimer (voice of Beachcomber, Seaspray, Warpath, and others in the original cartoon) is born. KABLOWIE!
- 1947 — Alexis Quiroz (Chilean voice of Scrapper and Starscream) is born.
- 1947 — José Carabias (Castilian Spain voice of Alpha Q, Hot Shot, Prowl, and Unicron in Armada and Energon) is born.
- 1952 — Jorge Roldán (Mexican voice of the Dynasty of Primes) is born.
- 1956 — Alejandro Villeli (Mexican voice of Prime Alpha Trion, Bulldog, Makeshift, Megatron, Ruination, and Sky-Byte) is born.
- 1956 — Jeff Manning (voice of Galvatron, Megatron, and Trypticon in The Transformers) is born.
- 1961 — Comic artist Art Wetherell is born.
- 1972 — Manish Wadhwa (Hindi voice of Wheeljack in War for Cybertron Trilogy) is born.
- 1977 — A baby is born, and his name is John Cena.
- 1977 — Jaime King (voice of Solus Prime in Power of the Primes) is born.
- 1979 — Mia Kihl (Swedish voice of Alexis and Lori) is born.
- 1983 — Aaron Hill (the taller frat guy in Revenge of the Fallen) is born. We checked.
- 1984 — Shannon McKain (voice of Graham Burns in Rescue Bots) is born.
- 1996 — The Beast Wars episode "Beast Wars (Part 2)" premieres in the US.
- 1998 — Takara releases Beast Wars II C-16 Lio Convoy.
- 1999 — Beast Wars II — ACT. 13 is released on VHS in Japan by Pioneer LDC.
- 1999 — Sumire Morohoshi (Japanese voice of the little girl in Transformers) is born.
- 2002 — The Original Transformers — Volume One, Two & Three are released individually on DVD in the US by Kid Rhino and as the "First Season Collector's Edition" box set.
- 2003 — Luca Tesei (Italian voice of Otis Watson) is born.
- 2004 — The Super Link episode "Aim for! Unicron" airs in Japan.
- 2004 — Transformers: Breakdown TPB is released by Titan Books.
- 2005 — The Galaxy Force episode "Wild Beast Reincarnation! Ligerjack" premieres in Japan.
- 2008 — Spotlight: Grimlock is released by IDW Publishing.
- 2012 — The Prime episode "One Shall Surrender, Part 2" premieres in Brazil.
- 2014 — Robots in Disguise #28 is released by IDW Publishing.
- 2016 — TakaraTomy releases Masterpiece MP-30 Ratchet.
- 2016 — The Rescue Bots episodes "New Normal" and "Bridge Building" premiere on Discovery Family.
- 2016 — The Robots in Disguise episode "Portals" premieres on Cartoon Network in the US.
- 2018 — CBS All Access is launched in Canada.
- 2020 — The Toy Clash! Roboca Battle arcade game is released.
- 2023 — First day of the Rise of the Beasts Optimus Prime & Optimus Primal World Tour in Berlin, Germany.
- 2023 — The Beast Wars Again episode "Defeat the Destrons (Part 2)" airs on TV Tokyo.
- 2024 — On this Transformers Tuesday, pre-orders for a reissue of the Legacy: Evolution Armada Universe Optimus Prime go up.
- 2025 — G.I. Joe #6 is released by Image Comics and Skybound Entertainment.
- 2025 — The Wild King episode "The Kindhearted Hydrophant" premieres on the TakaraTomy YouTube channel.
- 2026 — The Transformers Allspark Complete Edition Official is published by Hero-X.
- 1947 — Márcia Gomes (Brazilian voice of Red Alert) is born.
- 1958 — Zhao Xiaoming (Chinese voice of Ratchet, The Fallen and Lockdown) is born.
- 1959 — Glenn Morshower (Colonel Sharp in Transformers and General Morshower in Revenge of the Fallen) is born.
- 1969 — Rory McCann (voice of Megatron in EarthSpark) is born. YARP!
- 1974 — Italian singer Santo Verduci (and Italian voice of Galvatron, Pipes and more in the redub of Generation One) is born.
- 1981 — Douglas Guedes (Brazilian voice of Dave) is born.
- 1982 — Cassiano Ávila (Brazilian voice of 24K-Bit, Fottle Barts and Sky-Byte) is born.
- 1987 — The Fight! Super Robot Lifeform Transformers 2010 episode "The Ultimate Weapon" airs in Japan.
- 1990 — Ellie Main (voice of Moonracer in the War for Cybertron Trilogy) is born.
- 1990 — Miles Luna (voice of Teletraan I/Arkbot and Cliffjumper in the War for Cybertron Trilogy) is born.
- 1993 — Gabby16bit (Italian voice of Announcer Bot in Transformers One) is born.
- 1997 — Samina König (German voice of Elena Wallace) is born.
- 1998 — Beast Wars: Super Lifeform Transformers — There Are 2 Dinobots? and Resurrected Beast Power are released on VHS in Japan by Pioneer LDC.
- 2002 —The second printing of Transformers: Generation 1: Prime Directive #1 and the second printing of the Prime Directive Preview, along with the Armada Preview are released in the US by Dreamwave Productions.
- 2003 — After a nearly four month gap, Takara releases the second wave of Legends of the Microns product: MC-07 Devastor and MX-01 Double Face.
- 2003 — Japanese Toys"R"Us stores offer the promotional Land Military Night Attack Edition Microns (Bomb, Crack, and Shot), one free with the purchase of any Legends of the Microns product.
- 2006 — The Beast Wars Reborn text story, "Planetfall", is published in issue no. 99 of Figure Ō magazine in Japan.
- 2006 — The fourth show in the Kiss Players radio drama series airs in Japan on the "Lyrian Moe-tchao" program.
- 2008 — First day of BotCon 2008.
- 2008 — Henkei! Henkei! volume 2 is first published.
- 2008 — TakaraTomy releases Henkei! Henkei! Transformers D-03 Astrotrain.
- 2010 — The second wave of TakaraTomy's Animated toyline is released: Arcee, Blitzwing, Shockwave, Lugnut, Soundwave, and the two-packs of Ironhide/Soundwave and Prowl/Blitzwing.
- 2010 — The Animated episode "The Great Sound Wave Operation" debuts in Japan.
- 2013 — More than Meets the Eye #16 and G.I. Joe/Transformers Volume 3 are released by IDW Publishing.
- 2013 — Philip L. Clarke (voice of Dead End, Auggie Cahnay and others in The Transformers) passes away.
- 2015 — The Robots in Disguise episode "W.W.O.D.?" premieres in Germany.
- 2016 — The Robots in Disguise episodes "Misdirection" and "Bumblebee's Night Off" premieres in France.
- 2021 — TakaraTomy releases Kingdom KD-04 Megatron (Beast) and KD-05 Blackarachnia and Studio Series SS-59 Autobot Jazz, SS-60 Hot Rod and SS-61 Kup, plus Earthrise ER EX-23 Runabout and ER EX-24 Thrust and Kingdom KD EX-02 Vertebreak are released as TakaraTomy Mall exclusives.
- 2021 — The Rescue Bots Academy episodes "Enter the Flood" and "Wizard of Botz" premieres in the United States.
- 2023 — First day of the Rise of the Beasts Optimus Prime, Optimus Primal and Mirage World Tour in Las Vegas, Nevada.
- 2023 — The EarthSpark episode "Hashtag: Oops" premieres in France, Hungary and Turkey.
- 2024 — Duke #5 is released by Image Comics and Skybound Entertainment.
- 2025 — Transformers: Eternal War starts its closed Beta in Australia & New Zealand.
- 2026 — Hasbro officially reveals the Studio Series 86 Blitzwing, Cliffjumper and Cyclonus.
- 2026 — The last day to have one's shipping address changed for the HasLab Liokaiser.
- 2026 — Benoit Rousseau (Canadian French voice of Tom Banachek and Jetfire in the live-action film series) passes away at the age of 66, due to cancer.
- 1940 — The first publication date of the debut of The Joker.
- 1949 — Nicholas Kendall (director of the Beast Wars episode "Power Surge") is born.
- 1955 — Tony Fuochi (Italian voice of Beast Wars Megatron, Prime Megatron and Sixknight) is born in Milano, Italy.
- 1957 — Douglas Welbat (German voice of Megatron) is born.
- 1961 — Marcella Silvestri (Italian voice of Animated Blackarachnia) is born.
- 1967 — Riccardo Lombardo (Italian voice of Optimus Primal and Denny Clay) is born.
- 1969 — Gina Torres (voice of Airachnid) is born just in the nick of time, making her a big damn hero.
- 1969 — Iván Jara (Castilian Spanish voice of Scrapface) is born.
- 1970 — Gisa Bergmann (German voice of Arcee) is born.
- 1977 — Part One Co., Ltd., owner of the e-HOBBY online store, is founded.
- 1980 — Rika Morinaga (Japanese voice of Lori in Cybertron) is born.
- 1982 — Josh Kelly (Stone in Revenge of the Fallen and Dark of the Moon) is born.
- 1986 — The Fight! Super Robot Lifeform Transformers episode "Finding Alpha Trin" premieres in Japan.
- 1986 — Helena Coppejans (French voice of Strongarm in Robots in Disguise) is born.
- 1986 — Angelina Geisler (German voice of Acid Storm) is born.
- 1989 — The Victory episode "Infiltration... The Uranium Mine" premieres in Japan.
- 1993 — Jessica Ángeles (Latin-American Spanish voice of War for Cybertron Trilogy Airazor, Tina Lark and Nova Storm) is born.
- 1998 — The Beast Wars episode "Code of Hero" gets its regular syndication debut in the US.
- 2000 — Beast Wars: Metals—Yeah, I'm Back!, Love Typhoon and The Movie are released on VHS in Japan by Pioneer LDC.
- 2003 — The Legends of the Microns episode "慢心 (おごり) - credulous" premieres in Japan.
- 2003 — The Transformers: Space Pirates TPB is released by Titan Books.
- 2006 — The 15 Go! Go! chapter "Steeljaw Volume" is published in the June 2006 issue of Dengeki Hobby.
- 2007 — "Spotlight: Kup" and Transformers: Cybertron: Balancing Act are released by IDW Publishing.
- 2007 — The 15 Go! Go! chapter "Sparkbots Volume 5" is published in the June 2007 issue of Dengeki Hobby.
- 2008 — First full day of BotCon 2008. Dealer room opens, panels, "Faction Feud", special preview showing of the Transformers Animated episode "Garbage In, Garbage Out", Hasbro team live commentary on the Transformers live-action movie.
- 2008 — Transformers Adventures Volume 1 is released in the UK by Titan Books.
- 2009 — The Transformers Animated episode "Human Error, Part II" premieres in the US.
- 2009 — TakaraTomy releases Henkei! Henkei! Transformers C-20 Alert and C-21 Smokescreen.
- 2009 — Henkei! Henkei! volume 12 is first published.
- 2012 — The Transformers: Robots in Disguise #4 is released in the US, and The Transformers: Autocracy #8 is published online by IDW Publishing.
- 2013 — Transformers Legends is (finally) released for iOS devices.
- 2014 — Pre-purchase tickets for the Transformers Expo exclusive ""Slug G1 Color" toy are made available at Lawson stores in Japan.
- 2015 — The Robots in Disguise episode "As the Kospego Commands!" premieres on Cartoon Network in the USA.
- 2015 — The Robots in Disguise series premieres in South Korea on Tooniverse.
- 2015 — The Rescue Bots episode "The New Recruits" premieres on Discovery Family.
- 2015 — TakaraTomy releases Adventure TAV13 Nemesis Prime, TAV14 Ultra Magnus and TED 06 Big Optimus Prime, as well as Q-Transformers QT-18 Nemesis Prime, QT-19 Convoy and QT-20 Megatron.
- 2015 — Transformers: Age of Extinction makes its Latin American television broadcast debut on FOX1.
- 2017 — The Robots in Disguise episodes "King of the Hill (Part 1)", "King of the Hill (Part 2)" and "Blurred" premiere in France.
- 2020 — TakaraTomy releases Studio Series SS-48 Offroad Bumblebee and SS-49 Sentinel Prime and Earthrise ER-01 Hoist and ER-02 Optimus Prime with trailer, plus ER EX-01 Soundbarrier and ER EX-02 Grapple are released as TakaraTomy Mall exclusives.
- 2020 — The Rescue Bots Academy episodes "Trouble Cubed" and "My Favorite Rescue" premiere on Discovery Family.
- 2022 — Chinese mobile company Redmagic announces new collaboration with Transformers including an Optimus Prime-themed version of their 7 Pro mobile gamer phone and a Decepticon-themed variant as well.
- 2023 — The Transformers: EarthSpark episode "Outtakes" premieres in France, Hungary and Turkey.
- 2023 — Imre Szélyes (Hungarian voice of numerous Optimus Primes) passes away at age 79.
- 2024 — A Transformers product reveal stream occurs on the Hasbro Pulse YouTube channel officially revealing the Robosen Megatron and Transformers: Legacy United wave 3.
- 2024 — The Transformers Classics Vol.7 is released by Hero-X.
- 2025 — Transformers Go! Go! Wild King web special #2 is published.
- 2026 — TakaraTomy releases Age of the Primes AOTP-29 Amalgamous Prime, AOTP-30 Brawl, AOTP-31 Junkion Wreck-Gar, Studio Series TS-16 Barricade, TS-17 Nemesis Prime, and TS-18 Soundwave.
- 1933 — Jean-Pierre Moulin (European French voice of Sir Edmund Burton) is born.
- 1949 — Lee Yoon-sun (Korean voice of Ultra Magnus, Slapper and Midnight Express) is born.
- 1957 — Fábio Moura (Brazilian voice of Bulkhead, Makeshift, Doctor Morocco, Gunter and Ped) is born.
- 1958 — Leonardo Camillo (Brazilian voice of Ironhide) is born.
- 1966 — Satoshi Hashimoto (Japanese voice of Car Robots Fire Convoy and God Fire Convoy) is born.
- 1967 — Sascha Draeger (German voice of Hot Shot, Ransack, Shockwave and voice director of Cybertron) is born.
- 1976 — Sin-hui Park (Korean voice of Sari Sumdac) is born.
- 1976 — Emmanuel Garijo (European French voice of Lucas Flannery, but also Dave in BotBots) is born.
- 1978 — Fred Mascarenhas (Brazilian voice of Clampdown, Zorillor and Spinister) is born.
- 1979 — Jessica Toledo (Chilean voice of Arcee and Slipstream) is born.
- 1984 — Hector Gomes (Brazilian voice of Fairmaestro) is born.
- 1985 — Annina Braunmiller (German voice of Windblade) is born.
- 1986 — The Chernobyl Nuclear Power Plant disaster occurs.
- 1988 — The Super-God Masterforce episode "Kidnapping!? The Targeted Jumbo Jet" premieres in Japan.
- 1990 — Takayuki Nakatsukasa (Japanese voice of Theorem) is born.
- 1991 — Lei Changxi (Chinese voice of Optimus Prime, Hot Rod and Blurr) dies at age 65.
- 2000 — The Beast Machines episode "Endgame Pt. II: When Legends Fall" premieres in Canada on YTV.
- 2000 — The Car Robots episode "Ninja Robo! Enter the Spychangers" premieres in Japan.
- 2002 —Transformers: Primal Scream HC is released by Titan Books.
- 2003 — The Destruction White Microns are sold at "TF Station" affiliate stores in Japan as part of the "Golden Week" holiday, one per customer, with some stores using them in in-store "paint your own" activities.
- 2003 — The Armada episode "Rescue" premieres in the US.
- 2007 — TakaraTomy releases the Transformers: Beast Wars Telemocha Series TM-09 Rhinox.
- 2008 — The Animated episode "Mission Accomplished" premieres in Canada.
- 2008 — The Animated episode "The Return of the Headmaster" premiers in the US.
- 2008 — Third day of BotCon 2008.
- 2010 — The Cool Episode 2 is serialized by Kerokero Ace in their June 2010 edition.
- 2011 — Transformers Animated: The Cool - Special Edition and Clear Version Optimus Prime is released in Japan by Kadokawa.
- 2012 — First day of BotCon 2012 in Dallas, Texas.
- 2013 — "Battle of the Clones" is first published by Eaglemoss/GE Fabbri in Russia.
- 2013 — Prime — Folge 7: Orion Pax & Folge 8: Der falsche Prime are released to home media in Germany by EDEL:kids.
- 2013 — Prime — Vol. 18 & Vol. 19 are released to home media in Japan by Avex Trax.
- 2013 — Transformers: All Spark Episode 6: "The False Power" is serialized in Japan by Kerokero Ace in their June 2013 issue.
- 2014 — The Rescue Bots episode "What Lies Below" premieres on Hub Network.
- 2015 — The Robots in Disguise episode "Collect 'Em All" premieres in Japan.
- 2017 — Optimus Prime #6 and Micronauts: Wrath of Karza #1 are released by IDW Publishing.
- 2020 — The Cyberverse episodes "The End Of The Universe II", "The End Of The Universe III", "The End Of The Universe IV" premiere in the US.
- 2022 — Hasbro officially reveals Legacy Generations Selects Cyclonus & Nightstick.
- 2022 — Insurance Company Direct Line uploads a new commercial featuring Optimus Prime on their YouTube channel.
- 2023 — The EarthSpark episode "Missed Connection" premieres in France, Hungary and Turkey.
- 2024 — José Santa Cruz (Brazilian voice of Generation 1 Megatron, Armada Megatron and movie Megatron) dies at age 95.
- 2024 — The EarthSpark episode "What Dwells Within" premieres on YTV in Canada.
- 2025 — TakaraTomy releases the first wave of the Wild King toyline.
- 1926 — Miguel Rosenberg (Brazilian voice of Archibald Witwicky) is born.
- 1932 — Casey Kasem (voice of the original The Transformers cartoon Cliffjumper, Bluestreak, Doctor Arkeville and Teletraan I) is born, rocketing to #1 in the hospital charts.
- 1954 — Stefan Fredrich (German voice of Seymour Simmons) is born.
- 1964 — Nizo Neto (Brazilian voice of Spike Witwicky and Dylan Gould) is born.
- 2007 — The Transformers Collectors' Club members-only site releases an online bio for the "Maxcop" Stopgap.
- 2008 — Fourth and final day of BotCon 2008.
- 2011 — Transformers: Foundation #3 is released by IDW Publishing.
- 2011 — First day to preorder the Transformers Collectors' Club exclusives G2 Ramjet and Animated Cheetor.
- 2011 — Transformers Generations 2011 Vol. 1 is published in Japan by Million Publishing.
- 2011 — The Kre-O "Build A Bot" online mini-game/contest goes online at Nickelodeon.com as part of the "16 Weeks of Cyber Sweeps" campaign. (Busy day in 2011, wasn't it?)
- 2012 — Second day of BotCon 2012 in Dallas, Texas.
- 2013 — TakaraTomy releases a buttload of stuff. First is the premiere of the Transformers Go! toy line: G11 Hunter Optimus Prime, G12 Dragotron, G13 Hunter Shockwave, G14 Hunter Bumblebee, G15 Hunter Bulkhead, G16 Hunter Wheeljack, G17 Hunter Starscream, and G18 Hunter Soundwave. Generations continues with TG15 Autobot Data Disc Set (Rewind, Eject, Ramhorn, Sundor) and TG16 Decepticon Data Disc Set (Frenzy, Rumble, Ravage, Ratbat). Finally, there's the EZ Collection toys EG01 Optimus Prime, EG02 Bumblebee, EG03 Prowl, EG04 Smokescreen, EG05 Hound, EG06 Megatron, EG07 Starscream and EG08 Airachnid. Whew!
- 2015 — Transformers Prime: Beast Hunters — Season 3 Volume 1: Battle for Darkmount is released to home media in the United Kingdom by Primal Screen.
- 2015 — The Robots in Disguise episode "As the Kospego Commands!" premieres in Germany.
- 2015 — The fifth and final BotCon 2015 box set exclusive Oilmaster is revealed.
- 2016 — More than Meets the Eye #52 and Sins of the Wreckers #4 are released by IDW Publishing.
- 2018 — Zoltán Tóth (Hungarian voice of Alpha Quintesson and Backstop) dies at age 57.
- 2019 — TakaraTomy releases Studio Series SS-29 Shatter, SS-30 Optimus Prime, SS-31 Cogman, SS-32 Scrapmetal and SS-33 Rampage and Siege SG-15 Aimless, SG-16 Laserbeak and Ravage, SG-17 Ironhide, SG-18 Autobot Six-Gun, and SG-19 Starscream.
- 2019 — Transformers: Cyberverse episodes "Fractured", "Memory", "Allspark" and "The Journey" premieres in Japan.
- 2021 — Iara Riça (Brazilian voice of Nancy and Alice) dies at age 56.
- 2021 — Diana Pérez (Mexican voice of Kelly) dies at age 51.
- 2022 — Transformers #42 and War's End #3 are released by IDW Publishing.
- 2023 — The official trailer of Transformers: Rise of the Beasts is released.
- 2023 — The preliminary cast of Transformers One is announced during the Paramount panel at Cinemacon 2023.
- 2023 — The Transformers: EarthSpark episode "Security Protocols" premieres in France and Hungary.
- 2024 — TakaraTomy releases TL-59 Bouldercrash, TL-60 Megatron (Energon Universe), TL-61 Tasmania Kid, TL-62 Thundertron, TL-63 Optimus Prime (Animated), TL-64 Tigerhawk, SS-123 Mohawk, SS-124 Rumble , SS-125 Scrapheap, and SS GE-06 Starscream.
- 2026 — Writer Gerry Conway dies at age 73.
- 1961 — Jamieson Price (English voice of Warpath in War for Cybertron and more) is born.
- 1961 — Voice actor John Culkin is born.
- 1963 — Alberto Angrisano (Italian voice of James Savoy, Optimus Prime in War for Cybertron Trilogy from Earthrise onwards and EarthSpark Optimus Prime) is born.
- 1964 — Nathalie Homs (European French voice of Aron, Marty, Michelle, Nijika and brief voice of Arcee) is born.
- 1973 — Silvio Giraldi (Brazilian voice of Headmaster, Buzzstrike and Paralon) is born.
- 1975 — Brad Raider (English voice of Vince) is born.
- 1987 — Ximena Marchant (Chilean voice of Professor Princess and Teletran-1) is born.
- 1989 — The Transformers episode "The Rebirth, Part 1" premiers in Germany.
- 1990 — Erika Ugalde (Mexican voice of Skywarp) is born.
- 1999 — The Beast Wars Neo episode "Break Is a Predacon?" premieres in Japan.
- 2004 — Takara releases Super Link SD-11 Irontread.
- 2004 — Toys"R"Us Japan releases the "USA Edition" Energon Galvatron and promotional Micron Accel.
- 2004 — Legends of the Microns—Volume 13 is released on DVD in Japan by Columbia Music Entertainment, coming with the "Linkage Part 13" mini-comic and exclusive Quench toy.
- 2004 — Transformers Armada: Volume 3: Worlds Collide TPB is released by Dreamwave Productions.
- 2005 — Takara releases Galaxy Force GC-16 Ligerjack; Japanese Toys"R"Us stores offer the exclusive Mini-Con "Factor" free with the purchase of a Ligerjack. Meanwhile, JUSCO stores offer the exclusive promotional all-white Hellflame Microns: "Quasar" with the purchase of Galaxy Convoy, "Graviton" with Hybrid Style Galaxy Convoy, and "Bulge" with Ligerjack.
- 2009 — Transformers: The Veiled Threat is released in the US by Del Rey Books.
- 2010 — IDW's Transformers #6 is released by IDW Publishing.
- 2011 — The Transformers: Animated volume 9 DVD is released by Paramount Japan.
- 2011 — The Transformers Collectors' Club exclusive Generation 2 Ramjet sells out after one day of being available for pre-order.
- 2011 — The full trailer for Dark of the Moon goes live on iTunes Movie Trailers.
- 2012 — The Transformers: Prime episode "Flying Mind" and Transformers: Rescue Bots episode "Christmas in July" premiere on The Hub.
- 2012 — TakaraTomy releases Prime AM-08 Terrorcon Cliffjumper, AM-09 Soundwave, and the EZ Collection versions of Bulkhead and Arcee. "Shadow" versions of C.L., R.A., Gora and Baro are released as promotional exclusives at various Japanese stores.
- 2012 — The Super Robot Lifeform Transformers: Prime episode "Infiltration Transformation! Battleship Nemesis" premiers in Japan.
- 2012 — Third day of BotCon 2012 in Dallas, Texas.
- 2015 — The Robots in Disguise episode "Collect 'Em All" premieres in Germany.
- 2015 — Inker Rick Ketcham dies at age 44.
- 2018 — TakaraTomy releases Studio Series SS-01 Bumblebee, SS-02 Decepticon Stinger, SS-03 Crowbar, SS-04 Autobot Ratchet, SS-05 Optimus Prime, SS-06 Starscream, SS-07 Grimlock, and SS-08 Decepticon Blackout.
- 2021 — The Magic of Cybertron #1 is released by IDW Publishing.
- 2023 — The Transformers: EarthSpark episode "Bear Necessities" premieres in France.
- 2024 — The Transformers: EarthSpark episode "The Bear" premieres in Japan.
- 2026 — On this Transformers Tuesday preorders for the Studio Series 86 Blitzwing, Cliffjumper and Cyclonus go up.
- 1955 — Richard Epcar (Robots in Disguise writer and voice of Armorhide and voice of Skywarp from War for Cybertron) is born.
- 1960 — Steve Blum (voice of Dark Scream, the Autobot and Decepticon "Create-A-Bots", "Aligned" Starscream, Heatwave in Rescue Bots, EarthSpark Starscream, and more) is born. Rock On!
- 1961 — Thierry Mercier (French voice of Ratchet in Transformers The Game and the Revenge of the Fallen game, and Breakdown in the War for Cybertron game) is born.
- 1968 — Choi Jae-ik (Korean voice of Kickback) is born.
- 1973 — Teng Kuixing (Chinese voice of Rattrap and Terrorsaur) is born.
- 1975 — Musician Jesse Molloy is born.
- 1978 — Cinematographer Jonathan Sela is born.
- 1980 — Adrien Antoine (European French voice of Optimus Prime in Transformers One) is born.
- 1986 — Gábor Joó (Hungarian voice of Graham Burns) is born.
- 1998 — The Beast Wars II episode "Galvatron Revived" premieres in Japan.
- 2002 — Transformers—Original Series: Volume Two is released on DVD in the UK by Sony Wonder and Maverick Entertainment.
- 2008 — Transformers Animated Volume 3 is released by IDW Publishing.
- 2012 — Fourth and final day of BotCon 2012 in Dallas, Texas.
- 2014 — Shout! Studios releases the 30th Anniversary editions of all four seasons of The Transformers on DVD in the US.
- 2015 — More than Meets the Eye #40 is released by IDW Publishing.
- 2015 — The Robots in Disguise episode "True Colors" premieres in Germany.
- 2016 — TakaraTomy releases Adventure TAV 40 Ironjam & Bumblebee Kōtetsu Armor, TAV 41 Gravity & Optimus Prime Jūryoku Armor, TAV 42 Volcano & Grimlock Kazan Armor, TAV 43 Barithunder & Sideswipe Dengeki Armor, TMC01 Jetstorm, TMC02 Slipstream, TMC03 Divebomb, TMC04 Airazor, TMC05 Windra and TMC06 Psychobat. The Adventure promotional Micron Burn is also made available at Toys"R"Us Japan stores with the purchase of 3,000 yen or more's worth of Transformers toys.
- 2016 — The Robots in Disguise episode "Overloaded, Part 1" premieres in Hungary.
- 2017 — The Robots in Disguise episodes "King of the Hill (Part 1)" and "King of the Hill (Part 2)" premiere on Cartoon Network.
- 2021 — Billie Hayes (voice of Mrs. Neederlander and Virginia) dies at age 96.
- 2021 — Kazuo Oka (voice of Fastlane, Getsuei, and Snapdragon in The Headmasters) dies at age 73.
- 2022 — Very brief early footage from Transformers: Rise of the Beasts was shown at the Cinemacon 2022 event
- 2023 — TakaraTomy releases Studio Series SS-101 Laserbeak and SS-102 Rumble (Blue).
- 2023 — The EarthSpark episode "Classified" premieres in Cantonese.
- 2024 — Arianne Borbach (German voice of Botanica, Charlotte Mearing and Airazor) dies at age 61.
- 2025 — Pre-orders for the threezero MDLX Red Alert go up.
- 2026 — First day of the Transformers Meet Japan pop up event at the Miraiya Books Tsudanuma Store in Miyagi, Japan which runs until May 31.
- 2026 — TakaraTomy uploads the "Business Trip! Wild King Research Institute - Episode 13 -" to YouTube.
- 1952 — The first-ever commercial for Mr. Potato Head is broadcast on US Television, effectively becoming the first-ever toy commercial.
- 1960 — Dick Eriksson (Swedish voice of Generation 2 Sideswipe, Skywarp, Spike Witwicky, Starscream, and Swoop) is born.
- 1963 — Alessandra Karpoff (Italian voice of Slo-Mo) is born.
- 1965 — Adrian Pasdar (voice of Micronus) is born.
- 1968 — Laura Lenghi (Italian voice of Kelly) is born.
- 1969 — The first Kmart Australia store opens up in Melbourne, Victoria.
- 1973 — Katja Schmitz (German voice of Hayley) is born.
- 1975 — Jorge Destez (Brazilian voice of Side Burn) is born.
- 1981 — Grzegorz Woś (Polish voice of Graham Burns) is born.
- 1981 — Ibnu Jamil (Indonesian voice of Joshua Joyce) is born.
- 1982 — Pascaline Crevecoeur (Second French voice of Windblade and voice of Nightra in Robots in Disguise) is born.
- 1984 — Yuri Tupper (Brazilian voice of Sideswipe in Transformers: War for Cybertron Trilogy) is born.
- 1987 — The Fight! Super Robot Lifeform Transformers 2010 episode "The Big Broadcast of 2010" airs in Japan.
- 1988 — Kamil Dominiak (Polish voice of Kade Burns) is born.
- 1993 — Gabriela Medeiros (Brazilian voice of Su Yueming) is born.
- 1994 — The Generation 2 episode "More than Meets the Eye, Part 1" premieres in Germany.
- 1996 — Sound editor Michael Tomack dies at the age of 53.
- 1998 — Takara releases wave 3 of the Beast Wars II toyline, the Autorollers D-17 Autostinger, D-18 Autocrusher, D-19 Autojetter, and D-20 Autolauncher.
- 2003 — More than Meets the Eye #1 is published in the US by Dreamwave Productions.
- 2004 — The Superlink episode "A Rain of Dinobots!" airs in Japan.
- 2005 — The Galaxy Force episode "Link Up! Liger Convoy" airs in Japan.
- 2007 — Transformers — The Classic Episodes is released on DVD in the UK by Mini Metro.
- 2009 — Final day of the ordering period for the Gentei! Gentei! Strafe toy through Transformers Basecamp, exclusive to holders of the Transformers-themed Visa credit cards in Japan.
- 2011 — The Transformers: Prime episode "Sick Mind" premieres on The Hub.
- 2011 — The Cool Special Edition is released in Japan by Kadokawa.
- 2012 — The Transformers: Prime episode "One Shall Rise, Part 3" premieres in Brazil.
- 2014 — More than Meets the Eye #28 is released by IDW Publishing.
- 2015 — The Robots in Disguise episode "Rumble in the Jungle" premieres in Germany.
- 2016 — The Robots in Disguise episode "Graduation Exercises" premieres on Cartoon Network in the US.
- 2016 — The Rescue Bots episode "Arrivals" premieres on Discovery Family.
- 2016 — TakaraTomy releases Unite Warriors Grand Galvatron.
- 2022 — TakaraTomy releases Studio Series SS-75 Perceptor, SS-76 New Destruction Emperor Starscream and SS-77 Sideswipe.
- 2023 — Final day of the Rise of the Beasts Optimus Prime and Optimus Primal World Tour in Berlin, Germany.
- 2023 — The Beast Wars Again episode "Cheetus's Crisis (Part 1)" airs on TV Tokyo.
- 2024 — On this Transformers Tuesday, pre-orders for a reissue of the MPM-12 Optimus Prime goes up.
- 2024 — TakaraTomy officially reveals the ESD-10 DX Prowl and ESD-11 DX Terran Thrash and pre-orders for them go up.
- 2025 — Void Rivals #18 and Transformers Deluxe Edition Book 1 HC are released by Image Comics and Skybound Entertainment.
- 2025 — TakaraTomy officially reveals the second wave of the Wild King toyline.
