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.

Sam Gifford remembers : In prewar years he was an arrogant southern cotton plantation owner, married to the daughter of a colonel. At the beginning of the war he was mobilized with his National Guard unit as a sergeant. Came the day when, revolted by the cowardice of his lieutenant, who had fired at his own men, he hit him. Downgraded, he was sent to a disciplinary battalion. Sam now discovers his new detachment, his new commanding officer, just another cowardly brute, Captain Waco Grimes. While in combat, Sam will gradually become closer to the privates, working-class people he used to despise. He will become another man, a better man.