Anniversaries/March 21
From Sonic Retro
March 21 (add)
- 1996 — Issue #35 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.
- 2001 — The Game Boy Advance is released in Japan. Issue #95 of the Sonic the Hedgehog comic series by Archie Comics is released in North America. Issue #203 of Sonic the Comic is released in the United Kingdom.
- 2003 — Sonic Advance 2 is released for the Game Boy Advance in Europe.
- 2004 — "Chris no Nagai Tabi", the 51st episode of Sonic X, airs in Japan. A prototype of Sonic Advance 3 is leaked on the internet, three months before its intended release.
- 2005 — Volume 1 of Sonic X, a DVD, is released in Australia.
- 2007 — Issue #173 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.
- 2012 — Issue #38 of Sonic Universe, Volume 2 of the Knuckles the Echidna Archives trade paperback series, and the hardcover comic collection Sonic: Genesis are released in North America.
- 2015 — "Dr. Eggman's Tomato Sauce", the 18th episode of Sonic Boom, airs in North America.