Sonic is still on the hunt for the culprit behind the badnik attacks and he recruits the Chaotix to help him out. They get results, but things start to escalate quickly and as Sonic soon realizes he's in way over his head.
Growing suspicious of danger ahead, Shadow the Hedgehog searches for the chaos emeralds with Rouge on a private mission while searching for Dr Eggman. When Shadow eventually finds him, he clashes heads with Sonic and the Chaotix over his fate.