Dragon Ball Z - Season 1 Episode 33 -

With Goku caught in the clutches of the giant ape Vegeta, Krillin and Gohan launch a desperate attempt to save him! All is for naught, however, as Krillin's Destructo Disk fails to sever the Saiyan's tail. But a single hope remains for reversing Vegeta's monstrous transformation, when an unlikely hero steps out of the shadows - Yajirobe!