Demonstrating that a little knowledge is a dangerous thing, a convicted strangler studies the paranormal and finds a way to render himself invisible. Once he escapes, he sets out to find and eliminate five women who remind him of the mother he murdered. A police lieutenant sets out to safeguard them and bring the invisible killer to justice.
Vietnam war hero, accused of murdering his brother, recruits his socialite girlfriend to hunt for the real killer.
An American agent is assigned to track down a renegade Soviet spy who is building an atomic device in Los Angeles and plans to destroy the city with it.
When four geologists who form a combine of five industrial companies turn up dead, the race is on to determine whether the culprit is a group of high-powered industrial interests or the government. A trouble-shooter is hired to find a net of deadly intrigue and treachery. The prize: a field to be leased to private industry by the state.
The relatives of a recently deceased man gather at his eerie mansion but before his will can be read, they start being murdered one by one.
In the future world of the year 2087, freedom of thought is illegal and the thoughts of the world's populations are controlled by the government. A small band of "free thinkers" send a cyborg back in time to the year 1966 to prevent a scientist from making the breakthrough that will eventually lead to the mass thought control of the future. Our time traveler soon discovers he is not alone when government agents from the future try to prevent him from carrying out his mission.
An American intelligence agent, aided by a Chinese-American female agent, uses a time-travel belt to thwart Chinese operatives who are attempting to import to Los Angeles the materials to make an atomic bomb.
A futuristic underwater sea-lab is having problems with a UFO that's parked between them and a nearby deep ocean trench. As they investigate, they attract the unwanted attention of a dangerous creature who puts the scientists and crew in danger.
The CIA sends playboy Mike Trent to Alaska with agent Vee Langley, posing as his "nurse," to investigate flying saucer sightings. At first, installed in a hunting lodge, the two play in the wilderness. But then they sight a saucer. Investigating, our heroes clash with an inept gang of Soviet spies, also after the saucer secret.