Astronauts blast off to explore the moon on Rocketship X-M or "Rocketship eXploration Moon". A spacecraft malfunction and some fuel miscalculations cause them to end up landing on Mars. On Mars, evidence of a once powerful civilization is found. The scientists determine that an atomic war destroyed most of the Martians. Those that survived reverted to a caveman like existence.

A shortage of zoo animals after World War II brings beautiful animal trainer Tanya, her financial backer and her cruel trail boss to the jungle. After negotiating a quota with the native king, they take more animals than allowed. Tarzan intervenes.

An artist working in a remote army post is juggling the storekeeper's daughter, his fiancée newly arrived from the east, and the Indian Chief's daughter. But when a vengeful settler manages to get the army and the braves at each other's throats his troubles really begin.

Scientists investigate a huge meteor that crashes into the ocean off Mexico, and encounter a skyscraper-tall, mobile machine which is designed to syphon energy from earth, including any energy directed at it in an effort to destroy it.

A group of archaeologists asks Tarzan to help them find an ancient city in a hidden valley of women. He refuses, but Boy is tricked into doing the job. The queen of the women asks Tarzan to help them.