Four American astronauts crashland on an unchartered planet and discover it is ruled by a race of intelligent apes who use a primitive race of humans for experimentation and sport. Astronaut Taylor (Heston) soon finds himelf among the hunted, his life in the hands of a benevolent chimpanzee scientist (McDowall).

In the near future, a plague has wiped out all of the cats and dogs. As a result, apes began to be kept as pets and eventually slaves. One ape, Caesar, son of talking apes from the future, leads a revolution to free the apes and take over the planet.

Mr. Chips is a shy and proper classics professor who teaches at an English all-boys school. He falls in love with a London dance-hall girl and decides to marry her. The couple makes Brookfield Academy for Boys its home and brightens the school with their unlikely union.

In this third Planet of the apes film, two intelligent simians from the future, Cornelius and Zira travel to present-day Earth. They become instant sensations, wined and dined and treated like celebrities -- until a high-level plot forces them to run for their lives.