Sonic the Hedgehog, Miles "Tails" Prower, Knuckles the Echidna, and Tangle the Lemur have a holiday in Kanto and meet Ash Ketchum, Pikachu, Brock, and Misty, who they have to team up with in order to save Kanto from Doctor Robotnik, who plots to destroy Kanto using his latest creation Hyper Metal Sonic.
