Dragon Ball Episode 102: Enter King Piccolo
Episode 102 of 153 of Dragon Ball, aired February 24, 1988, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Krillin is dead! As Goku sets out on a quest for revenge, his friends attempt to learn the identity of Krllin's killer. All clues lead to Master Roshi's past an evil, that could destroy the world!