After years of peace since the defeat of Piccolo Daimaoh, Goku now lives peacefully with his wife Chi-Chi and their son Gohan. But everything changes when a mysterious warrior called Raditz arrives on Earth, revealing that he is Goku's brother and that they both belong to the warrior race of the Saiyans, a brutal people who conquer planets.

As the battle with the Androids rages on, a fierce evil rises from the shadows: the monster known as Cell. Dr. Gero’s heinous creation is the ultimate weapon, a fighting machine built from the genetic material of the greatest warriors ever to walk the Earth!

In the seven years since Cell's defeat, life on Earth has returned to normal. Gohan has grown up and is now in high school. One day, everything changes with the arrival of a new World Martial Arts Tournament, which marks Goku's return from the Other World to reunite with his family and friends. But behind the celebration, the wizard Babidi appears in search of resurrecting the ancient demon Majin Boo, in order to complete his father's plans for universal domination.

Majin Buu's rampage continues, and the only hope of defeating this terrifying foe is the Fusion Technique. For this desperate plan to succeed, two fierce rivals, Goku and Vegeta, must combine their powers in a heroic attempt to stop Majin Buu once and for all!