Anniversaries/September 21
From Sonic Retro
September 21 (add)
- 1965 — Takashi "Thomas" Yuda, the character designer of Knuckles the Echidna, is born.
- 1995 — Issue #29 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.
- 2003 — "Saigo no Chaos Emerald", the 25th episode of Sonic X, airs in Japan.
- 2005 — Archie Comics begins publication of Sonic X in North America.
- 2010 — Sonic Adventure is released for the PlayStation 3 in North America.
- 2011 — Issue #32 of Sonic Universe is released in North America.
- 2021 — Sonic Boom Season 2, a Blu-ray, is released in North America.
- 2023 — Sonic Superstars Start Book, a book, is given out at Tokyo Game Show 2023 for free.