Sonic and Knuckles battle while Sonic is under the evil Dr. Eggman's control.

"The evil genius Dr. Eggman has been foiled--but the work of Sonic the Hedgehog isn't over yet. In the aftermath of the latest epic battle, rogue robots continue to attack small villages around the world. In order to defeat them, Sonic will need the help of his friends Tails, Knuckles, and Amy, along with some new and surprising allies"-- Back cover.