The final series of Dragonball Z starts off   with Goku competing in a fighting tournament in one of the four Kai's planet.   The result is that Goku ties with his worthy opponent. Meanwhile, Gohan is   training Goten in martial arts while Vegeta trains Trunks. Both Gohan and   Vegeta are surprised at how strong Goten and Trunks are as they turn into   their Super Saiyan form at such a young age. Gohan also has a girlfriend   (Sataan's daughter).

   Later, Gohan, a hero who has achieved the identity as the Great Saiyan-Man,   attends a tournament. When it is the Great Saiyan-Man's turn to compete, he   turns into his Super Saiyan form and his disguise is blown off. Everyone is   amazed that a nerd, Gohan, is the Great Saiyan-Man. All of a sudden,   Spopobitch and Yamu come out of nowhere and absorb Gohan's energy into a   "lamp" to revive Buu. Kai-shin and his partner, trying to prevent   Babi-di's and Darbura's plot to reactivate Buu, allow this to happen so that   he could follow the energy stealers to their hideout. (Babi-di's goal is to   destroy all life just for the fun of it.) But, he revives Gohan first. The   Saiyan warriors decide to go as well. A fight follows. Darbura turns Klilyn   and Piccolo into stone and Kai-shin's partner is killed. The Z warriors learn   that Klilyn and Piccolo will return to normal once Darbura dies. In battle,   Vegeta is turned into Babi-di's slave and an ?M? appears on Vegeta's   forehead. His energy is used to reactivate Buu. Buu betrays Darbura and eats   him. Thus, Piccolo and Klilyn are returned to normal. Majin-Vegeta beats   Goku, and then goes to fight Buu. Upon failing, Vegeta self-destructs and   dies. Afterwards, Bulma gathers the dragonballs to revive all those killed   since the fighting tournament. In the fights later on, Goku gets angry enough   and reaches Super Saiyan form 3 for the first time! (In stage three, Goku has   long hair and is more powerful than ever.) Gohan also heads to Kai-shin's   planet, pulls out the Z sword, and trains under Dai Kai-shin. Goten and Trunks   train as well to get stronger. From Goku, they learn the art of fusion to   fuse to become one, becoming Gotenks!

   However, our heroes are still no match for Buu. Although Darbura's, the   Prince of Darkness (Babi-di's associate who looks like a devil), and Babi-di's   (a little ugly sorcerer with tiny hairs growing out of his body) other   minions are killed, Buu gets stronger. Buu later revolts against his master   (Babi-di) and kills him. Before their deaths, the villainous Babi-di and   Darbura have cast a spell that turned Vegeta evil. However, in addition with   fighting against Goku, the evil Vegeta also fought Buu. Although defeated by   Buu, Vegeta later turns good again. It is here that Vegeta finally officially   becomes one of the good guys. (In previous times, Vegeta only aids our heroes   to assure that Goku lives long enough for him to kill him. But, he never   attempted to kill Goku since the early battle against him in the Vegeta   Series. Next, Buu separates into two forms-one good and the other evil. Evil   Buu defeats good Buu, turns the him into a cookie, and eats him. From this   method, the evil Buu gains the good Buu's powers and changes into a stronger   form. Buu, previously fat, is now skinnier and taller, not to mention a lot   stronger. Gotenks is also stronger; he is now able to turn into Super Saiyan   stage 3, like Goku. But, he is still defeated on one of his encounters with   Buu and Buu engulfs SSJ3 Gotenks. Thus, Buu absorbed Gotenks' powers and   becomes stronger again. He changes form again! (His "antennae" grows   longer and he now wears a black vest like Gotenks'.) Piccolo is also defeated   and eaten by Buu. Meanwhile, Gohan had mastered the Z sword and learned how   to use his hidden powers without getting angry under training with Dai   Kai-shin. (He does not turn into his Super Saiyan form for the rest of the   series at this point.) Unfortunately, he too is defeated and engulfed. Buu,   now with Gohan's powers, changes form again. (He now looks like he's wearing   Gohan's clothes.) With the other warriors defeated, only Goku and Vegeta are   left to battle against Buu!

Goku is still dead and watches the fight through Kai-shin's crystal ball. Seeing the Goku is still dead and watches the fight through Kai-shin's crystal ball. Seeing the unfortunate odds for our heroes, Dai Kai-shin sacrifices he life to Goku and dies. Goku's halo disappears, and Dai Kai-shin wakes back up with a halo over his head. Now, Goku teleports into the battle. Vegeta, still dead, is also sent into battle by the judge of death. Goku acquired a pair of special earrings from the Kai-shins that when each one is worn by different people, the two will permanently fuse. With Goku wearing one of the earrings and Vegeta wearing the other, the two are pulled together and fused into Gogeta. At Gogeta?s turn to fight Buu, Buu seems to be of no match to Gogeta, but Gogeta purposely gets eaten by Buu to save the other Z warriors. This canceled the effects of the permanent fusion in Gogeta and he fisses back into Goku and Vegeta.

Next, Buu undergoes another form change and temporarily becomes very muscular as he stands still in pain through the form change. Goku and Vegeta are now inside of Buu's organs. They find Trunks, Goten, Gohan, and Piccolo, and rescue them by carrying them out of one of Buu's pores. As they leave Buu, the warriors grow bigger and are restored to their normal size. Fat Buu, the good Buu, also escapes from Buu's body. The evil Buu, still "puffy" and bulky, is undergoing his form change to restore to his original form. (The Kai-shins cursed him into his previous fat looking form for destroying their people.) Afterwards, he is little and short. Next, evil Buu does a giant fireball and blows up Earth!!! Luckily, Goku had enough time and teleported himself and his comrades to another planet. Later, the Namek dragonballs are gathered and a wish is made to restore the earth. The little Buu also met with the fat Buu. They fight, but the good Buu is once again defeated.

Eventually, Goku and Vegeta are later fighting Buu. Vegeta stalls Buu as Goku gathers the energy to do a super Genki-Dama fireball. While Vegeta is getting kicked around by Buu, Piccolo, Gohan, Goten, and Trunks are on earth trying to convince the earthlings to raise their hands so that their energy will be given to aid Goku strengthen his fireball.Because no one on earth listens to the heroes, a new approach is taken. Sataan is contacted for help. Because of his fame, he goes into public and raises his hands. All of his fans, everyone on Earth, raise their hands too to show their appreciation to Sataan. With everyone's hand raised, energy is transferred to Goku and now he has enough power to destroy Buu. With a single super fireball, Buu is destroyed.

At the end, the fat Buu, who was beaten unconscious, awakens and enters our heroes' side. Ten years past. Goten and Trunks are now teenagers. Gohan married Videl and now has a 5 year old daughter, Pan. Goku wished to fight the evil Buu all over again, so he wished for the reincarnation of the evil Buu. The evil Buu, now Ubuu, is reincarnated (and not evil anymore) and under the training of Goku. There is peace on the earth?