Sonic Headchog

''This article is about Sonic the Hedgehog from the Underground Galaxy. For other versions, see Sonic the Hedgehog (disambiguation).''

Sonic Headchog was the Sonic the Hedgehog of the Underground Galaxy. Like his counterparts, he was willing to accept any challenge, and took Run the Hedgehog up on his offer to race around the whole planet. After Sonic took off at the beginning of the race, he was killed along with the other inhabitants of Earth when Run blew up the planet.