The Man They Could Not Hang

A physician on death row for a mercy killing is allowed to experiment on a serum using a criminals' blood, but secretly tests it on himself. He gets a pardon, but finds out he's become a Jekyll-&-Hyde

After hapless pianist and ex-con John Elman is framed for murder, he is resurrected by a scientist after his execution.

An escaped convict uses miniaturized humans to wreak vengeance on those who framed him.

Mary Shelley reveals the main characters of her novel survived: Baron Henry Frankenstein, goaded by an even madder scientist, builds his monster a mate.

Returning to the ancestral castle long after the death of the monster, the son of Dr. Frankenstein meets a mad shepherd who is hiding the comatose creature. To clear the family name, he revives the cr

A nurse tries to bring her own style of relief to miserable people, or ones condemned to die. Her identity is a mystery, and she may not be quite what she seems.

Five people receive an anonymous letter revealing a secret of theirs and inviting them to come stay at a mansion that houses a clinic run by a corrupt doctor who experiments on the brain of his comato

A mad scientist is forced to leave San Francisco after his experiments become known. He lands on a tropical island, takes control and terrorizes the local populace. The survivor of a shipwreck washes

A mad doctor abducts women with his ape-man helper for cruel brain experiments. A female wrestler seeks revenge after her sister becomes a victim.

A scientist finds a way of becoming invisible, but in doing so, he becomes murderously insane.

After a young woman is coerced into prostitution and her brother framed for murder by an organized crime syndicate, retribution in the form of an ape visits the mobsters.

Dr. Jekyll faces horrible consequences when he lets his dark side run wild with a potion that transforms him into the animalistic Mr. Hyde.