From Sonic Retro
December 31: New Year's Eve (
- 1975 — Amy Palant, the English voice of Miles "Tails" Prower in Sonic X and in the games from 2005 to 2010, is born.
- 1997 — Issue #120 of Sonic the Comic is released in the United Kingdom, sporting a new look.
- 2013 — Issue #59 of Sonic Universe is released physically in North America.
- 2016 — "In the Midnight Hour", the 60th episode of Sonic Boom, airs in North America.
- 2019 — Sonic the Hedgehog Volume 3: Battle For Angel Island, the third trade paperback of the Sonic the Hedgehog comic series by IDW Publishing is released in the United Kingdom.