A human-male named Farrow finds a crashed spaceship, goes inside, and discovers three astronauts - one dead, two unconscious. He carries the two unconscious ones to his cave and, after they revive, shows them an old book with a photo of New York City in the year 2503. Shocked, the astronauts figure that while they left Earth in the year 1980, they've somehow come back to Earth more than a thousand years later, and that apes now rule the planet! Farrow is killed defending the astronauts who are captured by apes, tried, and thrown into a cell. They escape in company with a sympathetic chimp named Galen and begin a series of adventures. Written by dinky-4 of Minneapolis

Burke and Virdon are faced with having to fight to the death when they are captured, and the Ape Prefect amuses himself by staging gladiator-style fights between the humans in his charge.

When they are buried alive, underground, in an ancient San Francisco subway station during an earthquake, Burke and General Urko are forced to work together. Above ground, Galen and Virdon try to figure out a way to help Burke, with the assistance of several gorilla soldiers. Written by Ape Freak

When Galen hurts his leg and can't travel, Virdon and Burke seek refuge in a farm till their friend recovers. The farm is operated by a gruff but decent ape named Polar, his wife Zantes, and their three children: older son Anto, younger son Remus, and daughter Jillia. Polar puts to work the two strangers who teach him about contour farming, windmill building, seed selection, etc. Polar soon accepts these changes but Anto resents the strangers, fearing they will hex a cow about to give birth. (Until the cow delivers a bull calf, Anto can't start a farm of his own.) When Virdon helps deliver not one but two bull calves, Anto is won over and names the calves Virdon and Burke. Written by dinky-4 of Minneapolis

Burke and Virdon discover a holographic message from scientists from their own time, which might help them find out what happened to their world, while they are exploring the ruins of Oakland.

While walking on an ocean beach with Galen, Virdon and Burke see a condemned man lashed to a raft in the water. They rescue him and carry him to a nearby cave but then an ape-on-patrol captures the two astronauts and takes them to his boss, Hurton. Hurton administers a fishing operation and he presses Virdon and Burke into service as fishermen after they pass a test by swimming under a sheet of flames. Trouble arises when Hurton's superior, Bandor, comes on an inspection tour, but the astronauts save the day by demonstrating how a net can catch more fish than spears. They credit this innovation to the once-condemned man, Gahto, who's then re-united with his daughter, Soma. Written by dinky-4 of Minneapolis

Galen risks his freedom, and life by contacting his old sweetheart, Kira, when Virdon is seriously injured. Kira is now a talented, and forward thinking, surgeon; and Galen shares with her a forbidden book on human anatomy, that he and Burke stole from Dr. Zaius' home, with her. Written by Ape Freak

Galen, Virdon and Burke befriend a chimpanzee named Fauna, the blind daughter of a human friendly ape who was killed by a band of vigilante apes known as the Dragoons. Unaware that Burke is human, Fauna falls in love with him, as Galen and Virdon hunt down the Dragoons, only to discover that Fauna's uncle is one of them. Written by Ape Freak

Virdon agrees to race a chimpanzee Prefect's horse against Urkos best horse, in exchange for a condemned boy's freedom. Urko has never lost a race, but of course, as Virdon finds out, Urko doesn't play fair. Despite Urko's treachery and cheating, Virdon prevails in the end. Written by Ape Freak

When Burke is captured by Urko's soldiers, he is forced to face two equally horrifying options: he can either be killed, outright, by Urko; or he can be used in a brainwashing experiment, being performed by a prominent ape doctor, using a forbidden (human) text on the subject. Written by Ape Freak

To foil the plans of a tyrannical gorilla who is trying to overthrow the chimpanzee prefect and gain control over a human farming district, Galen, Virdon and Burke risk an encounter with Urko. Urko and Burke are forced to work together again (Air date: 9/27/74). Written by Ape Freak

With the help of an ape doctor, Virdon and Burke race to concoct a cure for a malaria outbreak. They must succeed before Urko implements his own version of a cure: burning down the village with everyone in it.

When they are captured by a human community that provides human slaves to the apes, Virdon and Burke's survival is dependent on convincing their captors to rebel against the apes. This episode was not aired during the series original run in some areas in the United States. Written by Ape Freak

Unaware that a chimpanzee scientist plans to use a human prisoner's flying machine for her own deadly purpose, Virdon, Burke and Galen help the man to build a hang glider. This was the final episode of the series. Written by Ape Freak