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.