Breaking free from his master Babidi, the rampaging Buu turns the entire world into his candy store. To fight back, Goku transforms into his strongest form yet, the Super Saiyan 3. But the world's only hope may lie in Trunks and Goten, the world's youngest and most promising fighters. Using an alien fusion technique, they attempt to merge to form a single, even more powerful hero, Gotenks. Meanwhile, as Buu destroys city after city, the people of Earth call forth their secret weapon, the seemingly invincible (but actually incompetent) Hercule.