Dragon Ball Episode 138: The Mysterious Hero
Episode 138 of 153 of Dragon Ball, aired December 14, 1988, 25 minutes. Available with English subtitles and dub where released.
Episode summary
With some difficulty, Junior defeats Krillin, even though it looked as though they were evenly matched. Then, Yamcha faces Hero, who is really Kami, using the human to defeat Piccolo Jr.. Does Yamcha have a chance?