Dr. Eggman has built the Death Egg II, along with Metal SonicTailsmanages to build a rocket ship called the Lunar Fox, capable of flying into space in order to stop Eggman's plans. However, the Lunar Fox only contains one seat and requires the power of eight Chaos Emeralds. With each emerald in possession of an individual who each wants a shot at Eggman, a fighting tournament is held to decide who will ride the Lunar Fox into space.