Sonic the Hedgehog #27

"A Scrambled Hedgehog": For years, the Freedom Fighters have relied on Sonic's speed and confidence to get them through the worst situations. But where would they be without their quick-footed friend, or worse yet, if he were fighting for the other side? In this dramatic two-part tale, Sonic turns on his friends after losing his memory and being tricked by Robotnik to find Knothole and give away its secret location!