 After many battles, including the destruction and re-creation of the Earth, a resurrected Goku destroys Boo with a "Genki-Dama" (a sphere of pure energy drawn from all intelligent beings on Earth) and wishes for him to be reincarnated as a "good person".Ten years later, at the "Tenkaichi Budōkai", Goku meets Boo's human reincarnation, Oob.After testing his powers, Goku departs with Oob to train him to be the Earth's new guardian.