 Dr. Eggman, a brilliant scientist, dreams of world domination and intends to accomplish this by using the six Chaos Emeralds, currently held on South Island, and which give legendary power. Eggman builds a base on the island and begins turning innocent animals into robot slaves in order to achieve his goals. Sonic, a super-fast blue hedgehog, hears of these developments and goes to save his friends. Although South Island is now infested with Eggman s mechanical devices, Sonic has one advantage: Eggman doesn t realise that the Chaos Emeralds are not on the island itself, but in a secret zone caused by its movement. Sonic sets out to acquire the gems before Eggman and confront him in order to restore peace to South Island.