Dr. Steven Sorenson plans to tap the geothermal energy of the Earth's interior by means of a thermonuclear device detonated deep within the Earth. This experiment causes a crack to form and grow within the Earth's crust, which threatens to split the earth in two if it is not stopped in time.
Attracted by the report of the development of a new type of rocket fuel, the vicious dictator of Krangkor, the dark planet, descends on Earth to steal the formula from its creator, the benevolent Dr. Makin.
The superhero Starman is sent by the Emerald Planet to protect Earth from belligerent aliens from the Sapphire Galaxy. The Sapphireans (or "Spherions") kidnap Dr. Yamanaka and force him to use his spaceship against the Earth.
A scientist experimenting with suspended animation decides to use himself as a test subject. Before he is frozen, his wife is killed, and he is suspected of her murder. a murder suspect.
Martians fear their children have become lazy and joyless due to their newfound obsession with Earth TV shows. After ancient Martian leader Chochem suggests that the children of Mars need more fun—including their own Santa Claus—supreme leader Lord Kimar assembles an expedition to Earth. Once there, they kidnap two children who lead them to the North Pole, then capture the real Santa Claus, taking all three back to Mars in an attempt to bring the Martian children happiness.
Radioactive waste dumped off the coastline creates mutant monsters. The beasts attack slumber parties, beaches, tourists, and terrorize a waterfront community as a scientist, his daughter, her boyfriend and the local police try to find a way to stop them.
An alcoholic actress, her personal assistant, and their pilot are downed on a secluded isle by bad weather, where a renegade Nazi scientist is using ocean life to develop a solvent for human flesh. The tiny flesh-eating sea critters that result certainly give our heroes a run for their money - and lives.
The legendary empire of the lost continent of Mu reappears to threaten the world with domination. While countries unite to resist, an isolated World War II Captain has created the greatest warship ever seen, and possibly the surface world's only defense.
After an astronaut space capsule is detonated in orbit, with the astronaut begging to be killed, a teenager couple finds a severed arm on a remote beach. The boy takes the arm home, where it becomes animate and the alien force which animates it soon possesses his mind as well.
After an unusual meteor shower leaves most of the human population blind, a merchant navy officer must find a way to conquer tall, aggressive plants which are feeding on people and animals.
Many years after a nuclear war, the human survivors have created a new society where much of the work done by androids, referred to derisively by humans as "clickers". A police official who is concerned that his sister has become involved with an android is sent to investigate a larger rumor that the androids are developing reason and emotion.
Dr. Bill Cortner and his fiancée, Jan Compton, are driving to his lab when they get into a horrible car accident. Compton is decapitated. But Cortner is not fazed by this seemingly insurmountable hurdle. His expertise is in transplants, and he is excited to perform the first head transplant. Keeping Compton's head alive in his lab, Cortner plans the groundbreaking yet unorthodox surgery. First, however, he needs a body.
In the distant future, the post-nuclear holocaust Earth is divided into two rival superpowers, North Hemis and South Hemis. Both empires are engaged in competitive race to reach Mars. When a badly under-equipped rocket malfunctions and begins drifting toward the sun, its helpless crew is rescued by the rival mission team. The combined crew continue the flight to mars, when colossal monsters lies in wait on the Martian moons!
A refugee Soviet scientist arrives at a desert airport carrying secret documents, but is attacked by a pair of KGB assassins and escapes into the desert, where he comes in range of an American nuclear test and is transformed into a mindless killing beast.