A hypnotist is able to predict murders by a terrifying sea monster. In reality, he causes the murders through his lovely assistant, who is the reincarnation of the monster.
A mad scientist, who discovered the secret of eternal youth by draining of blood from a young woman, gets executed. His ancestor moves into the home, eventually discovering the scientist's body. He revives him, and the terror continues.
People are mysteriously disappearing near a remote Cornish village, where a scientist is experimenting with reviving the dead.
Dr. Henry Jekyll experiments with scientific means of revealing the hidden, dark side of man and releases a murderer from within himself.
