September 23

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• 1846 — Neptune (the planet, not the combiner) is discovered by German astronomers.
• 1956 — Peter David (author of the Dark of the Moon novelization) is born.
• 1964 — Mauro Eduardo Lima (Brazilian voice of Ratchet, Angry Archer and Soundwave) is born.
• 1967 — Raúl Anaya (Mexican voice of Wheeljack, Blurr and Tarantulas) is born.
• 1972 — Masayuki Katō (voice of Lio Convoy and Smokesniper in Robotmasters) is born.
• 1975 — Rita Almeida (Brazilian voice of Adrias) is born.
• 1976 — IDW artist Andrew Griffith is born.
• 1985 — The Generation 1 episode "Autobot Spike" premieres in the US.
• 1990 — The Super-God Masterforce episode "The Birth of the Third Powermaster" premieres in Malaysia.
• 1996 — The Beast Wars episode "Equal Measures" premieres in the US.
• 1998 — The Beast Wars II episode "Enter Lio Junior" premieres in Japan.
• 2000 — The Beast Machines episode "Sparkwar Pt. I: The Strike" premieres in the U.S. on Fox Kids.
• 2002 — The Transformers — Complete Original Series: Deluxe Edition is released on DVD in the UK by Sony Wonder and Maverick Entertainment.
• 2003 — The Legends of the Microns episode "脅威 (ひゅどらきゃのん) - threaten" premieres in Japan.
• 2005 — The Transformers: Fallen Star TPB is published by Titan Books.
• 2005 — Third day of BotCon 2005.
• 2009 — Best of UK Omnibus is released by IDW Publishing.
• 2011 — The Transformers: Prime episode Darkness Rising, Part 1 premieres in Germany.
• 2013 — The Transformers Linkin Park Soundwave: Special Edition is released.
• 2014 — The Transformers Prime compilation DVD "Ultimate Autobots" is released in the US by Shout! Factory.
• 2015 — Windblade vol.2 #7 is released by IDW Publishing.
• 2015 — José Granadillo (2nd Latin-American Spanish voice of Cybertron Red Alert) dies at age 54 from cancer.
• 2015 — The Robots in Disguise episode "Some Body, Any Body" premieres in Hungary.
• 2015 — The Robots in Disguise episode "Ghosts and Impostors" premieres in Italy.
• 2016 — First day of the Angry Birds Transformers mobile game's "The Blues Brothers" Challenge Event.
• 2016 — The Rescue Bots episode "Did You See What I Thaw?" premieres in Hungary.
• 2017 — The Robots in Disguise episode "Prepare for Departure" premieres on Cartoon Network.
• 2020 — Transformers: The Definitive G1 Collection: Volume 97: G.I. Joe vs. Transformers, Part 3 is released by Hachette.
• 2020 — Hasbro PulseCon 2020 exclusives go up for sale/preorder on the Hasbro Pulse website; notably the "Quintesson Pit of Judgement" set, which sells out quickly, gets re-listed for pre-order, then pre-sells out quickly.
• 2021 — Marvel Productions executive David DePatie passes away.
• 2022 — The Buzzworthy Bumblebee 44BB Optimus Prime, 95BB N.E.S.T. Bonecrusher and N.E.S.T. Autobot Ratchet are officially revealed.
• 2022 — First Day of the Takara Tomy Hobby Expo in Akihabara Radio Hall in Kanda, Chiyoda-ku, Tokyo.
• 2022 — Transformers: Age of Extinction is released on DVD in Ecuador.
• 2023 —The Transformers: EarthSpark episode "Disarmed" premieres in France.
• 2023 —The Transformers: EarthSpark episode "Prime Time" premieres in Hungary.
• 2025 —Writer Ron Friedman passes away.