Who Will Defeat Majin Buu? The Mightiest of Men Moves Out! (魔人を倒すのは誰だ？最強の男始動!! Majin o Taosu no wa Dareda? Saikyō no Otoko Shidō!!) is the one hundred thirty-ninth episode of Dragon Ball Z Kai. Its Japanese air date is November 30, 2014. Its American airdate is November 11, 2017.
Gotenks arrives to fight against Majin Buu. Despite showing a great amount of strength, Gotenks is overwhelmed by Majin Buu's power. Gotenks barely manages to escape from Majin Buu after he launches an all-out attack against the armed forces. Meanwhile, Mr. Satan reluctantly confronts Majin Buu, who becomes amused with his traps disguised as presents. Majin Buu decides to make Mr. Satan his servant.