To study a rogue planet heading for a near-miss with Earth, Prof. Elliot sets up an observatory on the foggy moors of a remote Scottish island, with his pretty daughter and Dr. Mears, a former student with a shady past. Soon after arrival of reporter John Lawrence, a ship from Planet X just happens to land near the observatory. Is the visitor (who actually looks alien) benevolent? What are Mears' real motives for trying to communicate with it?

When a woman inherits a valuable house, her nasty husband and his mistress plot murder. But the house has a protective poltergeist who thwarts the wicked pair.

A small-town doctor (William Prince) gets caught up in a revenge plot when his small daughter is kidnapped and buried alive as he is given a few short hours to find her before she suffocates. To cover the risk of a heart attack while viewing the film, Producer-Director William Castle provided each member of the audience with an official certificate issued by Lloyds of London to insure them for $1,000 against death by fright. The gimmick worked and Castle was on his way to movie exploitation stardom!

In the excavation of Pompeii, a stone-encrusted body is found with a bronze medallion bearing a strange Etruscan inscription. Carlo Fiorillo, Italian archaeologist, speculates the robust body may hold some life; medical researcher Paul Mallon scoffs at the idea. But people left alone with the seemingly petrified "faceless man" keep dying of crushed skulls; and Paul's artist fiancée Tina starts having strange visions...

Five beautiful showgirls are trapped by a storm and find refuge in a creepy old castle. The owner of the castle, a strange nobleman, has a secret laboratory in the basement and has his own plans for the girls.

A young woman inherits a family curse that turns her into a murderous feline when she is angered.

Using hypnosis, Dr. Carlo Lombardi claims that he can have his patients regress and recover memories from their past lives, thereby proving that reincarnation exists. He also claims that the spirit of these past lives can be brought forth to take physical form.. A series of violent murders by a creature that seems to disappear into the sea suggests that Lombardi's claim may be correct. The medical and scientific community believe him to be a complete fraud but one enterprising businessman sees the opportunity to make a small fortune with Lombardi's ability.

In this third Gill-Man feature, the Creature is captured and turned into an air-breather by a rich mad scientist. This makes the Creature very unhappy, and he escapes, killing people and setting fires in the process.

Dr. Henry Jekyll is a dull, bookish scientist who spends more time with his lab animals testing theories of alternate personalities than with his beautiful, young wife. Kitty Jekyll has given up trying to find any passion in her distant, preoccupied husband and is involved in an affair with one of Jekyll's old 'friends,' Paul Allen, a weak slacker and wastrel who relies on Jekyll to pay his numerous gambling debts. After experimenting on himself, the bearded, tweedy Jekyll transforms himself into the young, dynamic, and self-confidant Edward Hyde. In his new character he befriends Allen, who has no idea of that this clean-cut, handsome playboy prone to outbursts of violence is really Jekyll. As Hyde, he encourages Allen to introduce him to the dark underbelly of London's night life including opium dens and sex clubs, where he begins an affair with the sensual courtesan Maria, an exotic dancer and snake charmer. When he tries to seduce Allen's mistress, in reality his own wife, he is frustrated to find she prefers her decadent lover to him.

Archaeologists investigating some Mayan ruins come across a blob-like monster. They manage to destroy it with fire, but keep a sample. Meanwhile, a comet is due to pass close to the Earth - the same comet passed near the Earth at the time the Mayan civilization mysteriously collapsed. Coincidence?