Rise Again and Sonic the Hedgehog 4 Episode I & II Original Soundtrack, both CDs, are released in Japan. Issue #239 of the Sonic the Hedgehog comic series by Archie Comics, plus the trade paperback Sonic Universe Graphic Novel Series Volume 3: Knuckles Returns, is released in North America.

Rise Again, a CD, is released in the United Kingdom.

Issue #237 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.

Issue #9 of the Sonic Universe comic series goes on sale in North America.

Issue #23 of the Sonic X comic series is released in North America.

Sonic Hopping 2 is released for Vodafone Live! (256KB) compatible phones through Sega's Sonic Cafe portal in Japan. Issue #178 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.

Meteor Shower Messenger, a novel based on Sonic X, is published in North America. Issue #153 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.

Mi-Ra-I, a CD single, is released in Japan.

Issue #208 of Sonic the Comic is released in the United Kingdom.

 Sonic Adventure: Prima's Official Strategy Guide is published in North America. Issue #164 of Sonic the Comic is released in the United Kingdom.

Issue #28 of the comic series Knuckles the Echidna is released in North America.

Sonic Underground begins airing on the TF1 network in France. Issue #22 of the Knuckles the Echidna comic series is released in North America.

Issue #141 of Sonic the Comic is released in the United Kingdom.

Issue #17 of the comic series Knuckles the Echidna is released in North America.

The final stand-alone special from Archie Comics, Sonic Blast, is released in North America.

Issue #69 of Sonic the Comic is released in the United Kingdom.

Issue #67 of Sonic the Comic is released in the United Kingdom.

Issue #60 of Sonic the Comic is released in the United Kingdom.