From Sonic Retro
December 6 (
- 2003 — "That's What Friends Are For", the 14th episode of Sonic X, airs in North America.
- 2005 — Sonic the Hedgehog is released for i-mode 90x devices in Japan.
- 2014 — Super Smash Bros. for Wii U is released for the Wii U in Japan, featuring Sonic as a guest fighter. "Eggheads", the 8th episode of Sonic Boom, airs in North America.