King Kong is the main villain in the episode "1000 Years of Courage" as the uncle of the Monkey. He and his nephew live in a future world inhabited by anthropomorphic bananas and run a scam that they are admitting members of this species into banana heaven ("Bananahalla") so that he can eat them.
However, the scam was King Kong's idea and he forced his nephew to disguise himself as the Ruler of the Banana People. At the near end, King Kong is overpowered by the Banana People, and at the stage, King Kong is seen playing a barrel organ with the Monkey, now wearing a hat and a vest, hopping around holding a mug.