Ten years after the Spirit Bomb Triumphant over the once devious Majin Buu (Kid Buu form), Goku, Vegeta and the rest of the Z-Fighters are at the World Martial Arts Tournament, Goku, Vegeta, Goten, Trunks, Pan, and Good Buu/Mr.Buu as competitors, Krillin, Marron, #18, Piccolo, Chi-Chi, Bulma, Turtle, and Master Roshi as spectators. Of course the Z-Fighters get past the preliminaries along with Hercule. Goku then asked Good Buu to use his magic to match him up with Uub. Goku then explains to Vegeta that Uub is the final form (technically first form, Kid Buu) of Majin Buu reincarnated.