Bulma is arrested by a mysterious group of militant, heavily armed refugees while traveling to Namek. At first, they accuse the trio of being henchmen of the evil Frieza that destroyed their home planet. However, when the Earthlings help in a dangerous situation, the refugees allow them to continue on their journey to Namek. They reach the planet and, with the help of two Namek natives, begin their search and find two Dragon Balls. The battle between Vegeta and 18 begins. Once the other Z Fighters arrive, Vegeta refuses to accept their help. 17 agrees not to interfere with Vegeta and 18's fight. Vegeta realizes 18 was toying with him and gets beaten up. Trunks then turns Super Saiyan and leaps into battle to defend Vegeta.

After being completely dominated on the battlefield, Majin Buu blows himself up in a desperate attempt to destroy Gohan in the blast! But is this just a ploy? Gohan seems to think so! Is Majin Buu plotting an ambush or simply trying to buy a little time? Powered by his insatiable hunger, Majin Buu escapes the Hyperbolic Time Chamber, leaving Piccolo and Gotenks trapped inside. Krillin and the rest of the gang are forced to fight the monster on their own. Will Majin Buu finally have his way and make a meal out of the good guys? Goku explains the art of fusion. They decide to teach it to Goten and Trunks. Bulma calls Shenron, and wishes for everyone that was killed by Vegeta to be revived.Krillin uses the final wish to take the bomb out of Android 18, purely because that he has fallen in love with her. Gohan and the others descend from Kami's lookout, preparing to celebrate the newly restored peace, while Chi-Chi tries to cope with the loss of her husband, Goku. Trunks says a final farewell to his parents and heads downstream through the mystical river of time. He then begins to concentrate on the serious tasks that await him upon arrival in the dreaded future that almost was. Meanwhile, Hercule begins to take all the undeserved glory for Cell's defeat, and it appears that only Gohan's family and friends know the actual truth, but Gohan doesn't seem at all bothered, he and the Ox-King are too busy sneaking away from Chi-Chi. Along Snake Way, Goku and King Kai decide it's time for them to settle down and find a suitable place to live, so King Kai begins constructing their new home. Before Gohan gets to school Gohan stops some local thugs thus turning into a Super Saiyan thinking no one will recognize him. When walking away after defeating the thugs he runs into Videl, Hercule's daughter. He manages to get away while an old man tells Videl what happened. When finally getting to school he finds out how fast things can go around the city for everyone in school is making a legend of him and calling him the golden fighter. Gohan has a hard time keeping his identity secret for Videl thinks that the Golden Fighter is him. Then comes baseball and he accidentally shows a little bit of his power. Then he finally gets though the day. Somehow..... The Z-Fighters gather at the 25th World Martial Arts Tournament, and wait for Goku to arrive. As they are scoping about the tournament, their hero, who has been missed for 7 years, arrives and gets to meet his second son for the first time. Bulma, Gohan and Krillin have been taken captive by an army of children. The children believe that they are allies with Frieza, who destroyed their planet, and it?s going to take more than a few kind words to convince the kids of their innocence. The Battle of the Buus begins as Majin Buu must fight his evil counterpart! The good Buu soon gets a taste of his own medicine when he is turned into chocolate! And when Evil Buu gobbles him up, a horrible transformation takes place! Who is this radical, new Majin Buu?

With no new battles to fight, Goku has been living a quiet life in the countryside with his wife Chi-chi and their son Gohan! While Goku makes plans to spend a happy day with friends on Master Roshi's island, a powerful new threat is on its way to Earth. And the arrival of this sinister alien could spell disaster for Goku and his friends! The next round of the tournament is Goku vs Aqua. Aqua transforms the ring to a pool of churning water. Arqua again has Goku beat in the underwater environment, but Goku uses his Solar Flare to blind Aqua, and then blasts him out of the ring with his Kamehameha to win the match. With Earth erased from existence, Majin Buu begins his search for Goku and Vegeta, leaving entire worlds destroyed in his wake. But when Buu's hunt leads him to the World of the Kais, Goku and Vegeta draw the line! The Super Saiyans lure Buu away by raising their power levels and disclosing their whereabouts, setting the stage for the Battle of All Battles! Goku comes across a house on Snake Way and a beautiful woman named Princess Snake tries to kill him without him knowing it.With the Ginyu Force by his side, is Frieza on the verge of taking over the universe? Or will Vegeta?s new alliance with Gohan and Krillin prove to be a sufficient deterrence? Can our heroes get to the remaining Dragon Balls in time to summon the Dragon and make their wish? It?s a race for survival, and every second counts! takes down Vegeta. Trunks steps in to help. Tien and Piccolo try to join in, but are defeated by Android 17. 18 shatters Trunks' sword and defeats the two Super Saiyans. Now the androids set their sights on Goku's house. With Goku caught in the clutches of the giant ape Vegeta, Krillin and Gohan launch a desperate attempt to save him! All is for naught, however, as Krillin's Destructo Disk fails to sever the Saiyan's tail. But a single hope remains for reversing Vegeta's monstrous transformation, when an unlikely hero steps out of the shadows? Yajirobe! Unable to stand by and watch the torture any longer, Gohan leaps out of hiding to rescue a Namek boy from the clutches of Frieza?s evil henchmen. Now Gohan and Krillin have an even bigger problem on their hands ? Dodoria is chasing them, and he won?t stop until he has his revenge! Goku begins his battle against Frieza, and it seems he and Frieza are equally matched, and Frieza admits that he is the strongest Saiyan. Meanwhile, King Kai reveals that Goku might just have a chance, that if anyone could take down the evil Frieza, it would be him. Goku and Frieza match blow for blow, and Piccolo, Gohan and Krillin have trouble just watching them. The Z Fighters watch on as Goku is thrown into a pool of lava, and it seems that no-one stands a chance now, but Goku rushes up to the surface and reveals he is only beginning to warm up.

Goku fully heals, thanks to a Senzu bean from Yajirobe. He then breaks out of the hospital and leaves for Namek in a rebuilt version of his old Saiyan space pod, built by Dr. Briefs. Meanwhile, Gohan and Krillin watch as Frieza invades a Namekian village. To the surprise of the Z Fighters, 17 kills Dr. Gero, and 18 prepares to activate another android. Trunks turns Super Saiyan and fires a powerful blast that destroys the lab, but the androids are unharmed and 18 releases Android 16. 17 and 18 learn 16's mission is to destroy Goku. Vegeta chases after the three androids. While the others follow, Vegeta catches up with the androids and challenges them to battle. 18 accepts the challenge. Frieza's deadly energy disk continues to follow Goku across the almost exploding planet Namek, Frieza grows desperate and in trying to destroy Goku, who manages to counter every move, creates another disk and begins to lose control of Goku's moves. When Goku resumes his assault against Frieza, he is distracted. Frieza's energy disks costs him the battle, slicing him and his power in half, making Goku the victor.Unable to allow Vegeta to kill anymore innocent bystanders, Goku reluctantly accepts Vegeta's challenge. At Goku's request, Babidi teleports them to the outside of his ship and Goku sends Gohan and the Supreme Kai to go and destroy Buu before his release while he fights Vegeta. Goku then powers up to Super Saiyan 2 and prepares for his rematch battle with Vegeta.