From Sonic Retro
April 3 (
- 2008 — Spaceship Blue Typhoon, a book, is released in North America.
- 2013 — Tails Adventures is released on the Nintendo 3DS Virtual Console in Japan. Issue #247 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.
- 2020 — "Kaotikusu, Uchū e Iku", the 59th episode of Sonic X, airs in Japan.