Lesson Number One
Locked in the final battle with Earth's Saiyan attackers, Goku begins to demonstrate the skills and training he received from King Kai beginning with a devastating attack on Nappa. But when Nappa concedes defeat under the command of Vegeta, he turns on Gohan and Krillin only to be stopped by Goku's Kaio-Ken attack. Broken and defeated, Nappa is finally vanquished by Vegeta leaving Goku to face him alone.
Aired 06/12/1989EP 29 - Lesson Number One
Dragon Ball Z
Goku is back with his new son, Gohan, but just when things are getting settled down, the adventures continue. Whether he is facing enemies such as Freeza, Cell, or Boo, Goku is proven to be an elite of his own and discovers his race, Saiyan. He meets many new people, gaining allies as well as enemies, as he still finds time to raise a family and be the happy-go-lucky Saiyan he is.
(Source: Anime News Network)