Pathos of Frieza
As Namek gets closer to explosion it looks like Goku can beat Frieza with ease as his power keeps increasing. Finally, Goku decides to leave, knowing that he's more than a match for Frieza, but the tyrant won't give up that easily.
Aired 14/08/1991EP 103 - Pathos of Frieza

1989
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)