7x37 - Dragon Ball Z: Dragon Box

Majin Boo is utterly annihilated by the Genki Dama! The long battle was finally over! Vegeta is about to kill the remaining (good) Boo, but Satan desperately leaps in to protect him. Satan takes custody of Boo, and they decide to live together. Half a year goes by, and with a wish to Shen Long, all the memories of Majin Boo are erased from the people of earth, and peaceful life once again returns.