Sonic blasts into Dr. Eggman's base to gain control of the Seven Chaos Emeralds and rescue his friends Cream & Cheese. In the heat of the battle, all seven Chaos Emeralds are joined together causing an overpowered Chaos Central to transport Sonic from his home planet and dropping him right in the middle of the city of Station Square. Is he alone in this human world? What happened to his friends? And why has he been sent here?