Dr. Cranum uses his brain machine to become a futuristic menace. Two boys joyride in an airplane. Rock creatures threaten civilization. A supertanker captain becomes reckless.

An aquatic alien force is threatening Earth, A girl is kidnapped while hitchhiking, an Earth city is shrunken and abducted by aliens, a space shuttle's botched docking with a space station disastrously cripples their power systems.

A swamp creature steals the plans for a new engine. A pair of runaways get in trouble. A vengeful scientist tries to get a planet to collide with Earth. A reckless scientist traps himself 2000 years in the future.