Previously, Dr. Robotnik put a robotic gorilla head on Sonic's body. While Sonic and Tails were defeating the Dr., Mario and Company mistook the robot Gorilla for Donkey Kong and took him home with them. Now Sonic must travel to the mushroom kingdom and retrieve his body. But there may be something bigger he has to deal with. Sorry this took so long, this goes out to all the Sonictoast fans. And don't worry, part 4 is almost done.