Return to the Planet of the Apes

Residents of Ape City awaken one night to the sight of a huge flying object attacking the city. Urko believes the humans are behind the attack and orders his troops to track down those responsible and capture the object.

Bill and Jeff, realizing that most of their plane's fuel was used up fighting the flying monster, set out to locate a new supply. However, Nova becomes ill during the trip and Judy hurries to Ape City in a race against time to get a cure for Nova.

Reports pour in to the police that burglars are striking all over Ape City. In fact, the burglars are General Urko and his troops, who hope to frame the Underwellers for the crimes.

Urko has been relieved of his duties for three months because of his recent negligence involving his leadership and the failed attempts at capturing Blue Eyes and the rest of the humans.