April 21
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- 1921 — Mark Twain, author and Ravage-tamer dies at the age of 75.
- 1973 — Katsuyuki Konishi (Japanese voice of Energon Optimus Prime and Cliffjumper) is born, declaring who the hell do you think he is.
- 1988 — The Super-God Masterforce OP/ED single "Chōjin Masterforce no Theme"/"Moero! Transformer" is released in Japan by Columbia Music Entertainment.
- 1996 — The Beast Wars episode "Beast Wars (Part 2)" premieres in the US.
- 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.
- 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 in the US by IDW Publishing.
- 2010 — The Transformers Animated OP single "TRANSFORMERS EVO." is released in Japan by Lantis.

