Sonic the Hedgehog is a popular character originating the eponymous Sega video game series. He also has a long-running Archie Comics series that has been published for nearly 20 years.
While the Teenage Mutant Ninja Turtles Adventures comics were still in print, the Turtles made a cameo appearance in Sonic the Hedgehog #2 in a panel where Michelangelo tries to make a guest appearance and help Sonic only to be told to scram.
In Sonic the Hedgehog #10, all four turtles were seen in the background during Sonic's trek through the sewers, the brothers comment that they're in the wrong comic book.
Also in the Knuckles the Echidna miniseries in issue #3 when Knuckle's home Angel Island is seen on fire we see amongst the fleeing animals a naked Michelangelo is seen making a cameo.
In Sonic Universe #26 when Silver the Hedgehog travels to an alternate timeline he and the Dark Freedom Fighters are seen using a base that resembles the Turtles Lair.
Finally in Sonic Boom #3, after Amy loses her Piko Piko Hammer she is seen trying out various other weapons like a bow staff that is designed similar to Donatello's.
- Roger Craig Smith (the voice of Pulverizer/Mutagen Man) is also the current voice of Sonic the Hedgehog, starting with the game Sonic Colors. Prior to that, Sonic was voiced by Jason Anthony Griffith (who also voiced Miyamoto Usagi in the 2003 series, and Mirage Leonardo in Turtles Forever) in the English Dub of Sonic X and in games prior to Sonic Colors.
- Rob Paulsen, who currently plays as Donatello and Raphael, played as a character in Sonic Satam named Antoine De'Coolete.
- Jim Cummings who voiced Shredder and more in the 87 series has also voiced Dr. Robotnik in the SATAM cartoon.
- David Zen Mansley who voiced the 2003 Bishop was the also the voice actor of Dark Oak from Sonic X.