Dragonball GT, the final series, begins 10 years after the events of DBZ. Gohan is married and has a daughter named Pan. Vegeta has settled down and also has a daughter, Bra. Goku is accidentally wished back to childhood by Pilaf in the Dragonball series, and the adventure continues. He learns of the "Black Star DragonBalls," which are scattered throughout space, and resolves to find them to become an adult again. However, he has only one year to gather the dragonballs or the Earth will explode. Goku, Trunks, and Pan blast off into space, crash-landing on various planets, picking up new friends and battling new enemies along the way. Among them is Baby, the only surviving member of Planet Plant, which was annihilated by the Saiyans long ago. He seeks revenge on all Saiyans, innocent or guilty. To beat him, Goku Transforms into his uncontrollable oozaru form and reaches Super Saiyan 4 level.

In the final adventure, the dragon Shenlong is once again summoned. However, the heroes are in for a shock - Shenlong has become evil due to the negative energy stored inside the DragonBalls due to negative wishes. In a desperate attempt, Goku collects energy dispersed throughout the universe to create a Spirit Bomb great enough to destroy the evil Shelong. He succeeds, and in the end, disappears with the good Shenlong.