In Mobotropolis, Sonic wakes up, sees Sally, King Acorn and Doctor Quack, and finds out that he is in Knuckles' body. Meanwhile, in Haven, Knuckles wakes up, sees Julie-Su, Locke and Sabre, and finds out he is in Sonic's body. Elsewhere, Dr. Robotnik and Dimitri revel in the irony that their memory erasing device accidentally swapped the memories of Sonic and Knuckles. The fiendish duo decide that they'll have fun defeating their mind-swapped enemies.