Babidi and Majin Buu plan to destroy West City, however Goku confronts them, hoping to buy some time. Meanwhile, Trunks is on a mission to retrieve the Dragon Radar from West City, which will be destroyed if Buu gets there first.

Due to his energy being drained from transforming into a Super Saiyan 3, Goku does not have much time left on Earth. He wastes no time, teaching Goten and Trunks the final key component to mastering the fusion technique.