when two little mobian kids arrived on earth who are struggling to surrive as they raised by a scistest with a kind heart named jimmy (who is also quirky) and lived in his house for 12 years, until one day jimmy was held captive by a man named dr. jullian ivo. robotnik (a selfish inteligient jerk who so happens to be jimmy's rival, which he needs him to finish his project the death egg), so sonic and tails started to use thier abilities to beat the forces of evil, as eggman held jimmy captive to his base. as tails improves an broken air plane, he tracks him down as they fly off to an island that no human has gone before, its called south island with them ended up meeting knuckles the echidna who thinks these two are after the master emerled that can destory his village, his tribe, the island and the whole world.