Things are looking up for Sonic and friends! Tails and Belle have been running tests on a friendly Motobug and hope to use their findings to reprogram other Badniks to be good. Without his robotic minions, Dr. Eggman's forces are weakened, but when a signal causes the Badniks to go wild, Sonic, Tails, and Belle unknowingly set out to defeat a foe mightier than Eggman.