Due to a malfunction of the Tornado (Tails' Plane), the plane crashed, Tails, Knuckles and Amy survived, but Sonic disappeared, and now he finds himself in a new city, where he meets Koa and his parents, who recently moved from Honolulu. Sonic explains to Koa that the new city may be in danger, and all because of the new robots and the return of Eggman, and if they are not stopped, the city may turn into a new Eggman Empire. But it's not that easy to stop. In order to save the city, they will have to embark on a very challenging and exciting adventure where they must find the chaos emeralds, find and meet new friends, and save the world.
