Catboy, Owlette, and Gekko go to Seaside Island, where they meet Sonic the Hedgehog, Miles "Tails" Prower, Knuckles the Echidna, Amy Rose, Rotor the Walrus, Pearly the Manta Ray, Vector the Crocodile, Espio the Chameleon, Charmy Bee, Tangle the Lemur, and Trevor Burrow the Mole, and they have to work together in order to stop Doctor Eggman from destroying Seaside Island.
