Seven years after the Android saga. Gohan has grown and is now a teenager in High School. He is attending Orange Star High School and has a secret identity as the Great Saiyaman. Gohan also has a girlfriend, the daughter of Mr. Satan, Videl. Chi-Chi has another son, Goten. Goten is best friends with Trunks who is now eight. Krillin and Android 18 have gotten married and they have a daughter named Marron. Gohan trains his little brother while Vegeta trains Trunks. Both are surprised when both children are able to obtain the level of SSJ. Goku, in the afterlife, competes in a martial arts tournament with his new friend and sparing partner, Paikuhan.

  Everything is at peace as another Tenkaichi Boudoukai is being held. The Z warriors all enter except for a select few (Yamucha). Goku, being dead, is given the opportunity to compete in the tournament and is given one day on Earth. Videl also enters. Piccolo starts off against a mysterious warrior known as Kaioshin. Kaioshin uses his magic to stop Piccolo from moving. Piccolo senses Kaioshin's great power and forfeits the match. A few more matches go on, and eventually Videl has to fight Supobitchi who has a weird “M” on his forehead. Videl beats the crap out of Supobitchi, but no matter what he always gets back up. Videl begins to get tired, and thats when the match turns around. Supobitchi begins to attack Videl and she is so tired that she can't defend herself. Unconscious Goku brings her a senzu bean and she is healed.

  Gohan then goes up against Kibito. The fight begins and Gohan turns SSJ. Supobitchi and Yamu, another competitor with the strange “M” on his forehead, pull out a strange lamp that absorbs Gohan's energy and he drops to the ground. The two mysterious fighters fly away and the Z fighters are mystified as to what just happened.

  It is at this point that they are approached by Kaioshin. Kaioshin, introduces himself and his assistant and restore Gohan’s energy. We then find out that Kaioshin is the supreme God of the Eastern Universe and he need the Z fighter's help to defeat an evil being named Babidi. This evil magician is being helped by the Prince of Darkness, Dabura. Babidi enjoys destroying all living things and has the ability to turn people who have evil in their hearts into slaves. Kaioshin reveals that Babidi’s plan is to revive an ancient being named Buu. In order to do this, he must collect a large amount of power. This is what Supobitchi did to Gohan. Kibito allowed them to drain gohan so that they could be followed to Babidi’s ship.

  Meanwhile, Supobitchi arrives back with the stolen energy and is killed by Babidi. The energy is given to Buu, and Babidi is surprised that Supobitchi was able to collect such a large amount of energy. The Z fighters, during this time, have followed Babidi’s two slaves back to the evil magician’s hideout. Unfortunately, they are sensed by Dabura and are confronted by the dark warrior. Kaoishin attempts to warn the fighters about Dabura’s special attack, but it is too late. Piccolo and Krillin are hit by his spit and are turned to stone. The only way to free their friends is to kill Dabura. Gohan, Goku, Vegeta and Kaioshin all enter Babidi’s lair to confront the evil prince.

  The fighters enter the ship on the first floor and are confronted by their first opponent. The only way to get to Babidi is to defeat a strong opponent at each level. Vegeta easily defeats the first fighter and they move to the next floor. Goku is next to fight and he also defeats his opponent. Finally, Gohan is next. Suddenly, Dabura appears and takes on Gohan. Gohan is loosing when Dabura suddenly breaks off the fight. The Prince of Darkness returns to Babidi and tells him of another plan to get the energy needed to revive Buu. He had observed Vegeta and realized that he had evil in his heart and could be made a slave by Babidi. Babidi casts his spell and Vegeta is captured in its intensity. Realizing what was happening, Kaioshin reveals that Vegeta is being made a slave in order to defeat them. Goku and Gohan tell Vegeta to fight the spell but Vegeta allows himself to become enslaved and an “M” appears on his forehead just like the one that Supobitchi had.

  Meanwhile, Trunks and Goten, steal a fighter's costume so that they can partisipate in the Adult competition. They end up competing against Android 18, Mr. Satan, and another fighter. Eventually it's only #18 fighting Trunks and Goten with a Mr.Satan staring up at them in amazement. #18 suspects that there are two of them when they keep changing positions, fighting with a different technique each time. When they transform into SSJ, Android 18 realizes it is Goten and Trunks and splits their costume in half, revealing the two boys. They look at each other with jaws down and fly off so that they will not be caught. They meet up with Videl, who tells them that Vegeta, Goku and Gohan have gone off to fight Babidi and Majin Buu. The two, excited to see a majin, rush off to join in the fight. At the same time, Android 18 is left to fight Mr. Satan. She makes a deal with him to allow him to win if he pays her the prize money from the competition. He agrees and she basically throws herself from the ring.

  Back at the ship, Goku, Gohan and Kaioshin stand shocked at Vegeta’s transformation. Babidi transports them to the middle of the Tenkaichi Boudoukai ring, where Mr. Satan is celebrating his victory. Vegeta challenges Goku to a fight and when he refuses, Vegeta blasts the stands, killing many spectators. Goku is forced to agree and asks for them to be transported to a remote area. His request is granted and the two begin what has got to be one of the best fights in DBZ. As they fight and injure each other, their power is donated to the resurrection of Buu. Gohan and Kaioshin arrive just as Buu’s power level reaches maximum. Babidi transports them outside the ship and Buu is resurrected.

  The newly released Buu kills Dabura for doubting his powers and fights Gohan and Kaioshin. As this happens, Vegeta is convinced by Goku to stop the fight so they can deal with the problem of Buu first. Just as Goku reaches for a senzu bean and turns his back on Vegeta, the Saiyan prince hits him on the back of the head and knocks him unconscious. Vegeta then realizes that he can no longer be evil because Goku’s good always wins out in the end. He then flies to confront Buu. Buu is more powerful and is able to get hold of Vegeta, beating him into unconsciousness. Fortunately, Trunks intervenes and knocks Buu off of his father. Trunks is soon joined by Goten and the two revive Vegeta. Vegeta then asks Trunks to take care of his mother. He then hugs Trunks for the first time and then knocks both of the boys unconscious.

  Piccolo who has been revived with Dabura’s death by Buu’s hands, takes care of Babidi. He attacks and chops him in half. Piccolo then flys to Vegeta and is asked by Vegeta to take the boys to safety. Piccolo realizes what Vegeta intends to do and quickly leaves the area with Krillin and the kids. Vegeta, truely good now, decides to sacrifice himself for the good of others. He wishes, Bulma, Trunks and Goku farewell and self-destructs. Buu is blasted into a million pieces in the Explosion.

  Unfortunately, Buu had not been defeated in the blast. All of the pieces that were scattered with the blast emerge as miniature copies and they gather and form the evil Buu again. Goku recovers finally and turns SSJ3 (which he aquired on heaven, but didn't use because it drains his energy to fast). Bulma, meanwhile, has collected the Dragon Balls and wishes that all the people killed by Babidi’s slaves be revived. Buu at this point, splits into two beings, one of good and one of evil. The good Buu is no match for his evil counterpart and is transformed into a cookie and eaten. Buu then is able to transform into a taller, more adapted to fighting form.

  During this time, Gohan is transported to Kaioshin’s planet. He travels with Kaioshin and his assistant to retrieve the Zed sword. His clothes are transformed and look similar to that of Kaioshin. He is able to pull out the sword and begins to train under Dai Kaioshin (who came out of the Zed sword). It is here we learn about Buu’s first appearance. Dai Kaioshin tells Gohan of an evil sorcerer named Bibidi, Babidi’s father, and how he controlled Buu and used him to destroy the Kaioshins. Buu was eventually cursed into a less powerful form, then trapped and Bibidi was defeated.

  Buu becomes irritated and demands to be taken to the powerful fighters. Meanwhile, Goku has been teaching Goten and Trunks the Fusion technique, he seems to believe this is the only way Buu will be defeated. Because he used Super Saiyan level 3 his time is taken up and he soon has to leave Earth, where he goes to kaioshin's planet to watch Gohan train. Buu threatens to kill everyone on Earth, so Piccolo takes Buu into the room of time and spirit and Gotenks fights him. They are evenly matched and it looks like there is no chance to defeat the evil villain. Piccolo blasts the door of the room of time and spirit to ensure that Buu can not escape. Buu, seeing his exit destroyed, creates a portal from his loud screaming that allows him to escape. Gotenks attempts to create the same portal but can’t. He powers up tremendously and he turns Super Saiyan Level 3, (he was saving this to show off in front of Piccolo) He is now powerful enough to create the same portal as Buu and escapes.

  They battle again and Dende's Palace is destroyed during the fight. Gotenks manages to blast Buu back down to Earth and he and Piccolo fly down to search for his body. Unfortunately, Buu is still alive and then Gotenks’ fusion wears off. The two young fighters are no match for Buu in their unfused state. Fortunately, Gohan has finished his training and is teleported back to Earth. He challenges Buu and beats the crap out of him. Buu, seeing he is defeated, blows himself up. The Z fighters believe that Buu has been destroyed and fly off, but are surprised when they are again confronted by Buu. Buu makes fun of Goten and Trunks saying they are to weak which makes them want to fight. They fuse again but it was a trap to get Gotenks' energy, Buu obsorbs them. (he says he didnt obsorb them before because he wanted there strength for as long as he could get it, the fusion wears off after 30 minutes). Because they were at SSJ3 form, Buu is now more powerful than Gohan. Gohan is being beaten and Buu sends a tremendous blast at him. Gohan attempts to block the blast but suddenly, another blast knocks Buu’s blast aside. Tien has appeared and has managed to repel Buu’s blast. Unfortunately, Buu quickly forms another blast.

  Vegeta’s soul is before King Yamma, and he is given life again so that he may help in the fight against Buu. Kaioshin meanwhile tell Goku about the Pottera earrings that will allow the wearers to fuse. Kaioshin and his assistant demonstrate how to wear the earrings allowing the two fighters to fuse permanently. Goku is given the earrings so that he and his son can fuse to beat Buu. Kaioshin then gives up his life so that Goku can return to Earth to fight. Goku teleports to Earth and arrives just in time to save Gohan from another one of Buu’s ki blasts. Goku throws a kienzan (ki disc) at Buu and he is chopped in half. Goku then tosses one of the earrings to Gohan and he begins to put it on. One part of Buu manages to consume Piccolo and the other consumes Gohan. Buu returns to his powerful form. Suddenly Vegeta arrives on Earth and Goku gives him the earring Gohan dropped. After much convincing, Vegeta agrees to wear the earring and the two are pulled together and transform into the powerful fighter, Vegetto.

  Vegetto fights against Buu but allows himself to be absorbed. He does this in order to rescue Gohan and the others that have been consumed by the evil villain. When they are absorbed, the permanent fusion of the earrings is counteracted and Vegetto splits back into Goku and Vegeta. The two find their fallen comrades and rescue them, escaping out of one of Buu’s pores. They return to their normal size as they exit his body. Unfortunately, with the absorption of Vegetto, Buu has enough power and now able to return to his original form. He forms a huge blast and blows up the Earth.

  Luckily, Goku with the help of Kaioshin, teleports Vegeta, Trunks, Goten, Gohan, Piccolo, Dende and Mr. Satan to Kaio-shin’s planet. They are followed by Buu who attacks Goku. Goku, it seems, is no match for the fighter and Vegeta intervenes to allow Goku to collect enough power for a Spirit Bomb. Vegeta is getting beaten when Mr. Satan shows up. Mr. Satan, believing that he is dreaming, approaches Buu. Buu attacks Satan, but he is able to dodge the attacks (basically it is pure luck that he does this because he is begging for mercy at the time). As he attacks, Buu suddenly stops and seems to be consumed with pain. All of a sudden, Buu spits out Fat Buu, who was friends with Mr. Satan. The two Buu’s fight, Good Buu unfortunately, is weaker and begins to loose. Vegeta and Goku must then take on Buu again.

  Vegeta tells Kaioshin to collect the Namekian dragonballs and three wishes are made. The first restores the Earth. The second revives all those killed by Buu and the third wish is saved for a later time. Vegeta distracts Buu long enough for Goku to form a huge Spirit Bomb (Genki Dama). The Z fighters ask that all the people on Earth raise their hands so they can donate their energy to make the Spirit Bomb bigger. Unfortunately, no one listens until they see their hero, Mr. Satan do it. Goku is then able to gather enough energy to form a large enough blast to kill Buu. Goku throws it at Buu but he is repelling it. The last wish from the Dragon Balls is used to restore Goku’s strength and the Saiyan is able to increase the strength of his blast. Buu is overwhelmed and can no longer hold off the blast. He is killed as the powerful attack consumes him.

  After the battle, Fat Buu recovers and Satan pleas with the Z fighters not to destroy him. They agree and Fat Buu joins them.