German Police Inspector Lohmann investigates a string of crimes resembling Dr. Mabuse's M.O. but Mabuse is in Professor Polland's care inside an insane asylum.
A woman arrives at a lonely mansion and finds herself mixed up with a lunatic who has built his own torture chamber, which is already crowded with victims - and he plans to make her his next one.
Alex Marsh has just created a serum combining hypnotic drug and nerve gas. Unfortunately he uses himself as a guinea pig and the drug transform him into a murderous monster.
Evil mastermind Dr. Mabuse seeks Professor Erasmus' secret invention, a device that makes one invisible, but a murder in a revue theatre brings the German police and the FBI into the mix.
Count Cagliostro, whose family has tried for generations to rid the world of vampires, instructs his daughter and her fiance to protect several valuable documents.
Emmaline, who, as a teenager, discovered the drowned body of her aunt (Lynn Bari), returns to the family mansion as a married woman. Eventually, she falls for the caretaker's nephew, and ...
An alien race sends cyborgs--made to look like the son of a famous scientist, whom they killed when he landed on their planet--to Earth to help pave the way for an invasion.
Mystery surrounds the ruins of an old tower house, where at select nights, a woman comes out wailing a song, amidst people committing suicide by throwing themselves off the tower. The ...
After a daring hold-up, a trio of thieves take refuge in an old dark house inhabited by a motley bunch of ghosts who only want to dispatch their guests in the most horrible manner possible ...
In order to stop a vampire from terrorizing the countryside, some locals decide to break into his coffin at night and steal his ashes. Complications ensue.
The evil scientist Dr. Caronte plots to revive the brains of three dead scientists and use them to obtain the formula for the super-powerful neutron bomb. The resulting creation needs blood...