A giant castle in a mysterious world. Two shady Majin, Gomah and Degesu, watch a monitor. The monitor shows Goku and the others having a fierce battle against Majin Buu. Gomah and Degesu head to Earth to execute a certain conspiracy.

As Goku and his companions head to where Gomah is, engine trouble causes them to land on a certain planet. The place they land happens to be a surprise-filled planet where even Supreme Demon Kings are afraid to tread!

Having been restored, Goku finally surpasses his limits! To defeat the mighty Giant Gomah, who keeps regenerating through the power of the Third Eye, everyone puts in their maximum effort in an all-out battle!