In a South American country a group of explorers discover a prehistoric monster in an ancient lake. The discovery leads them into conflict with the country's dictator.

Four scientists disappear in one day. All were born in the same county, on the same day. A fifth scientist is in jail and a federal agent is assigned to the case. The fifth man is sprung from jail by a mysterious stranger who says he's the young man's father.

Six future astronauts are put through a simulation of a long space flight.

An accident in a nuclear research facility opens a dimensonal doorway and allows deadly creatures to emerge.

A manned mission to Mars is menaced by Martian creatures who swim in the planet's sandy soil.

A dying astronaut agrees to have his brain implanted into a robot body.

A scientist named Ian Fraser invents a machine which can pierce the borderland between this world and... The Afterlife? Maybe. Fraser convinces an industrialist to finance future experiments with the possibility of contacting the rich man's dead son.

After returning from a mission to Venus, an astronaut can't seem to stay warm enough and has strange dreams about encountering a wraith-like being outside his spaceship window.

A college professor recreates the environment of a distant planet in a lab in order to study its evolution... which happens quickly.

After flying into a hurricane, the crew of a cargo plane bound for Tokyo is captured by an alien space probe.

A convict serving a life sentence finds that he has an alternative: change places with an alien.

A couple of motorists stranded in the desert are stalked by a bunch of tumbleweeds.

Scientists on a space station discover an unusual and dangerous plant.

Workers on a moon base find a mysterious rock that appears to be alive.

A radioactive rainstorm at a scientific base on a distant planet mutates a scientist driving him insane and making him telepathic.

A man experimenting with conciousness expansion drugs becomes super-human and not really human at all.

At a military base far in the arctic, a man invents a machine which allows two minds to contact one another. An earthquake causes a malfunction and two men wake up to find that their minds have switched bodies.

A man with a steel plate in his head overhears conversations about global conquest. But where are the voices coming from?

A scientist invents a pair of glasses which enable him to see and communicate with a two dimensional being.

An alien offers his technical knowledge of how to build a ray gun in exchange for a scientist's ability to feel emotions.

A man wants to capture a dangerous alien creature. Doing it himself would be way too dangerous, so he has his clone do it.

A young couple's honeymoon is cut short by the horrifying contents of a mysterious box.

A queen bee assumes a human appearance in order to make an unwary scientist into her new mate.

Two Martian investigators probe our custom of homicide.

Parents of a gifted youngster discover that their son's new tutor is not quite human.