The old age pensioners that left at the end of the first film come back to earth to visit their relatives. Will they all decide to go back to the planet where no-one grows old, or will they be tempted to stay back on earth, or will they?

A group of aliens return to earth to take back some cocoons of their people they left behind from an earlier trip. They kept the recovered cocoons in the swimming pool of a house they rented in a small Florida town. Their mission is hampered by a number of old people from an elderly home nearby, who have been secretly using the pool and discovering the unusual power of these cocoons.

Astronaut Brent is sent to rescue Taylor but crash lands on the Planet of the Apes, just like Taylor did in the original film. Taylor has disappeared into the Forbidden Zone so Brent and Nova try to follow and find him. He discovers a cult of humans that fear the Apes’ latest military movements and finds himself in the middle. Tension mounts to a climactic battle between ape and man deep in the bowels of the planet.

An U.S. Spaceship lands on a desolate planet, stranding astronaut Taylor in a world dominated by apes, 2000 years into the future, who use a primitive race of humans for experimentation and sport. Soon Taylor finds himself among the hunted, his life in the hands of a benevolent chimpanzee scientist.