Ten years after the end of Dragonball Z, Son Goku gets turned into a child again by a wish Pilaf made. The only way Son Goku can get back in his normal state is by finding the Black Star Dragonballs scattered across space. Son Goku, Pan , and Trunks go on journeys battling minor villans. At one planet, the DragonBall gang stumbles across Baby.
Baby sneaks on board and lands on Earth.
Baby takes over bodies in hope of finding a good host. Vegeta now turns into Babi-Vegeta. A great battle between Son Goku and Vegeta begins. It turns out Son Goku is no match for Babi-Vegeta. Then Kaiousin pulls out Son Goku's tail, hoping he can go into Oozaru stage.