Goku and Uub begin to fight, and it’s clear that Uub doesn’t know much about fighting. But as the match goes on, he learns more and more, and is able to go toe to toe with Goku. Uub nearly falls out of the ring, but Goku saves him from hitting the ground. He realizes that Uub doesn’t even know how to fly, so he decides to live with Uub in his village and train him. Despite his friends and family pleading with him to stay, he flies away with Uub. Goku decides to train Uub to defend the earth when he’s gone. He hopes one day, when Uub’s training is complete, to have a real all-out match with him to test their power. At the tournament, it seems that Pan wins.

The seeding draw for the tournament begins, and Goku has Majin Buu use his magic to rig it so that he faces the powerful mystery fighter he had talked about. In the first match, Pan faces Wild Tiger, and the four-year-old easily dispatches with him. Next up is Goku vs. Uub. Uub is the reincarnation of Buu. King Yemma apparently heard Goku’s wish right before Buu was destroyed, and he reincarnated Buu as a good person, named Uub. Uub is apprehensive, so to bait him into fighting, Goku resorts to taunting the young boy. After a particularly nasty insult and a kick to the face, Uub has snapped, and is now ready to fight.

Five years have passed, and Goku is training with Goten when Bulma and Vegeta show up. Goku says that he and Goten will be entering the World Martial Arts Tournament, so Vegeta says that he and Trunks will do the same. The day of the tournament comes, and old friends catch up. Everyone has arrived to watch. Gohan, who is now married to Videl, has decided not to enter, but his daughter, Pan, will fight. Since there is no junior division, she will be fighting with the adults. Hercule and Buu will be fighting, however, and Goku says that there is someone who is 100% human that can threaten to beat Goku and Vegeta.

Bulma has invited everyone to a barbecue at Capsule Corporation, and Goku’s family is ready to leave. The only problem is that Goku is nowhere to be found. Frustrated, Chi Chi and the boys leave without him. While everyone’s having a good time at the party, Goku is out on a mountaintop, looking after some eggs that are ready to hatch. He protects them from the storm and from predators. After they hatch, he finally arrives at the party, to the delight of everyone.

The Supreme Kai brings Dende back to the world of the Kais. Dende heals Vegeta and Goku. Hercule finds the body of old Buu, and asks Dende to heal him. Vegeta won’t let him, and plans to destroy him. He says it is too dangerous for any form of Majin Buu to exist, but Hercule continues to plead with him. Goku takes Hercule’s side, explaining to Vegeta that it was old Buu who saved Vegeta’s life right before Goku threw the Spirit Bomb. Vegeta reluctantly agrees, and Majin Buu is healed. Supreme Kai takes them all back to Dende’s lookout, where they reunite with friends and family. Goku tells his family that Elder Kai gave him his life, so he can stay on earth for good. Four months later, they use their remaining wish with Shenron, asking him to erase the memory of Majin Buu from the mind of everyone on earth, so that the good Buu can assimilate into society. Life finally returns to normal on earth.

Goku is ready to throw the Spirit Bomb, but Vegeta is in the way, and, despite Vegeta’s pleas otherwise, he refuses to take out Vegeta along with Buu. Suddenly, old Buu gets up and holds Kid Buu down long enough for Hercule to pull Vegeta to safety. Old Buu is kicked aside, and Goku throws the Spirit Bomb. It hits Kid Buu, but he starts pushing it back. Goku uses all of the energy he has trying to push it back into Kid Buu, but Buu is too powerful. Vegeta suddenly remembers that they still have a third wish with Porunga. He instructs Dende to wish for Goku’s power to be normal again. The wish is granted, and Goku is able to force the Spirit Bomb back at Majin Buu. As he does so, he silently wishes that Buu had been a better person, and hopes to fight him some day in the future. The Spirit Bomb hits with full force, driving Buu into the ground. Majin Buu is finally dead.

The old Buu is no match for Kid Buu, who begins to wail on him. Hercule continues to try to help the old Buu, but is ineffective. Vegeta suddenly comes up with a plan. He communicates with Dende, telling him to go to the new planet Namek and gather the Dragon Balls. The Supreme Kai and the Elder Kai take him there, and the Namekians are waiting with the seven balls. Porunga is summoned, and Vegeta tells Dende his two wishes: bring back the earth and restore it to its original state, and bring back all of the non-evil people that died since the morning of the World Martial Arts Tournament. These wishes are granted, and even Vegeta himself comes back to life. He finally reveals the main part of his plan to destroy Buu: the Spirit Bomb.

Buu is about to blast Vegeta, when suddenly Hercule starts to taunt him. Buu lets Vegeta go, and turns his attention to Hercule. The world champ, thinking that it’s all a dream, tries to destroy Buu, but is obviously ineffective. Buu winds up to punch him, but suddenly stops. He wrestles with his mind for a moment, and then spits out the fat form of Buu, who, though not part of his physical being, was still inside of Kid Buu. Hercule tries to beat up Buu again, but fails. Buu sends a blast toward Hercule, but it is knocked away by the old Buu, who has regained consciousness. Meanwhile, Goku still can’t gather enough energy. He starts losing energy, and falls to the ground in his normal form.