Dragon Ball Episode 139: Rematch
Episode 139 of 153 of Dragon Ball, aired December 21, 1988, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Hero starts by acting like a crazy man, however, Yamcha scratches to stay in the ring as Hero reveals his true abilityand identity. Goku and Tien Shinhan must fight one another in a friendly rematch to claim the last remaining spot for the semi-finals.