Dragonball Z, Vol. 14 - Quest
Krillin is taken to the eldest Namek, who uses special powers to increase Krillin's potential.  The Namek leader also gives Krillin the 7th Dragon Ball for safe keeping.  Meanwhile, Zarbon has placed the injured Vegeta into the recovery room so that Frieza can interrogate him about the location of the hidden Dragon Ball.  However, as soon as Vegeta recovers, he steals Frieza's five Dragon Balls and goes looking for the last one! Includes episodes 41-43.