December 21

1939 — Composer Franco Micalizzi is born.
1944 — Brazilian voice actor Paulo Flores is born.
1946 — Brazilain voice actor André Filho is born.
1955 — Werner Crock von Krumbiegel (German voice of G2 Hot Rod/Rodimus and Powerglide) is born.
1959 — Storyboard artist Lindsay Dawson is born in California.
1965 — Guillermo Martínez (Latin-American Spanish voice of Demolishor) is born.
1977 — Lyricist Hitomi Mieno is born.
1997 — Beast Wars: Super Lifeform Transformers — Enter the Super Lifeform Transformers and Cheetus' Crisis are released on VHS in Japan by Pioneer LDC.
2000 — The Beast Machines episode "Sparkwar Pt. I: The Strike" premieres in Germany.
2011 — The Transformers: The Death of Optimus Prime (formerly issue #125) is released by IDW Publishing.
2011 — The Transformers: Prime episode "Sick Mind" premieres in Poland.
2011 — Voice actor Pauli Virta passes away.
2012 — "Cell" is first published by Eaglemoss/GE Fabbri in Russia.
2012 — TakaraTomy releases the Asian market exclusive Classics Seeker Set Ace (Starscream, Skywarp and Thundercracker).
2012 — ~~The end of the world. Bummers.~~

Actual apocalypse may vary.

2016 — The Robots in Disguise episode "Worthy" premieres in Hungary.
2016 — The Transformers Legends Spin Off Cybertron Magna Convoy prequel comic is first published.
2017 — All Transformers games published by Activision are delisted from digital storefronts due to the expiration of their licensing agreement with Hasbro.
2018 — The Bumblebee movie is released in Bulgaria, Canada, Estonia, Lithuania, South Africa, Turkey, U.S. and Vietnam.
2018 — The Bumblebee (Motion Picture Soundtrack) is released by Republic Records.
2018 — The Bumblebee (Motion Picture Score) album is released on digital by Paramount Music.
2018 — The Cyberverse episode "Awaken Sleeping Giants" airs on the Cartoon Network app and website.
2019 — Achille Orsoni (French voice of Thundercracker in the War for Cybertron video game) passes away.
2019 — The Cyberverse episode "Ghost Town" premieres in Germany.
2023 — The Transformers Classics Vol. 6 is published by Hero-X.

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