Plot

After being kept in hypersleep during a long expedition into deep space, an astronaut crew crash-lands in the 40th century on a planet where highly intelligent non-human ape species are dominant and humans are enslaved.

Taylor and two other astronauts come out of deep hibernation to find that their ship has crashed. Escaping with little more than clothes they find that they have landed on a planet where men are pre-lingual and uncivilized while apes have learned speech and technology. Taylor is captured and taken to the city of the apes after damaging his throat so that he is silent and cannot communicate with the apes.—John Vogel <jlvogel@comcast.net>

In the year A.D. 3978, a spaceship with a crew of 4 crashes on a distant planet. One of the crew members had died in space, and the other 3 head out to explore the planet. They soon learn that the planet is much like their own. They then find the planet is inhabited by intelligent apes. One of the men is shot and killed, and the others are taken to the apes' city. There, one undergoes brain surgery and is put into a state of living death. The other befriends some of the apes but is feared by most. After being put through ape trial, he escapes with a female human native to the planet. After helping his ape friends escape a religious heresy trial, he escapes out into the wilderness with the female. There he learns the planet might not be so distant after all.—<tim1370@aol.com>

Astronaut Taylor crash lands on a distant planet ruled by apes 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.—Robert Lynch <docrlynch@yahoo.com>

After having their ship crash on a mysterious planet, two US astronauts wander across the desert plain. Thinking they are alone, the surprise comes when life forms appear, not just as mute human but as apes. Walking, talking apes. The apes see themselves as the original beings on the planet and do anything to keep all humans locked up.—FilmFanUk

Astronauts Taylor, Landon and Dodge awaken from deep hibernation after a near-light-speed space voyage. Their spacecraft crashes into a lake on an unknown planet; Taylor's estimate places them in Orion's Bellatrix System, 300 light-years from their home Solar System. Before they abandon their sinking vessel, Taylor (the mission commander) reads the ship's chronometer as November 25, 3978 - two thousand and six years after their departure in 1972. The three astronauts have been in hibernation pods and have aged slightly less than one year. However, a fourth astronaut, Stewart, is found to be dead, having aged rapidly after her hibernation pod was compromised.

The men travel through desolate wasteland, coming across eerie scarecrow-like figures and a freshwater lake with lush vegetation. While the men are swimming, their clothes are stolen and shredded by primitive mute humans. Soon after, armed gorillas raid a cornfield where the humans are gathering food. Taylor is shot in the throat as he and the others are captured. Dodge is killed and Landon is captured in the chaos. Taylor is taken to Ape City. Two chimpanzees, animal psychologist Zira and surgeon Galen, save Taylor's life, though his throat injury renders him temporarily mute.

Taylor is placed with a captive woman, whom he later names Nova. He observes an advanced society of talking apes with a strict caste system: gorillas are the military force and laborers; orangutans oversee government and religion; and intellectual chimpanzees are mostly scientists and doctors. The ape society is a theocracy, while the apes consider the primitive humans as vermin to be hunted and either killed outright, enslaved, or used in scientific experiments. Taylor convinces Zira and her fiancé, Cornelius, that he is as intelligent as they are by communicating through written messages and by making a paper airplane. Dr. Zaius, their orangutan superior, arranges for Taylor to be castrated against Zira's protests. Taylor escapes and finds Dodge's stuffed corpse on display in a museum. He is soon recaptured, and regains his voice, which alarms the apes.

A hearing to determine Taylor's origins is convened. Taylor mentions his two comrades, learning that Landon was lobotomized and rendered catatonic. Believing Taylor either is from an unknown human tribe beyond their borders or was the subject of a mad scientist who gave him the power of speech, Zaius privately threatens to castrate and lobotomize Taylor for refusing to reveal his origins. With help from Zira's nephew Lucius, Zira and Cornelius free Taylor and Nova and take them to the Forbidden Zone, a taboo region outside Ape City where Taylor's ship crashed. Ape law has ruled the area out of bounds for centuries. Cornelius and Zira are intent to gather proof of an earlier non-simian civilization - which Cornelius discovered a year earlier - to be cleared of heresy; Taylor focuses on proving he comes from a different planet.

When the group arrives at the cave, Cornelius is intercepted by Zaius and his soldiers. Taylor holds them off by threatening to shoot Zaius, who agrees to enter the cave to disprove their theories. Inside, Cornelius displays remnants of a technologically advanced human society pre-dating simian history. Taylor identifies artifacts such as dentures, eyeglasses, a heart valve and, to the apes' astonishment, a talking human doll. Zaius admits he has always known about the ancient human civilization. Taylor wants to search for answers. Zaius warns Taylor against finding an answer that he will not like, adding that the now-desolate Forbidden Zone was once a lush paradise. After Taylor and Nova are allowed to leave, Zaius has the cave sealed off to destroy the evidence, while charging Zira, Cornelius and Lucius with heresy.

Taylor and Nova follow the shoreline on horseback. Eventually, they discover the remnants of the Statue of Liberty, revealing that this supposedly alien planet is actually Earth, long after an apocalyptic nuclear war. Understanding Zaius' earlier warning while Nova looks on in shock, Taylor falls to his knees in despair, cursing humanity for destroying the world.