As the elderly Dr. Garth, Boris Karloff is developing a serum which he hopes may preserve life. He's been convicted of the mercy killing of a terminally sick friend but yet is allowed to continue his experiments while on death row with the aid of prison physician Dr. Miller.
Garth decides to use himself as a guinea pig and injects himself with a serum made with the blood of a known murderer. The kindly doctor is subsequently pardoned from his crime, and the end result of his experiment produces the amazing effect of turning him into a much younger man.
He has now inadvertently reversed the aging process, but the tainted formula has one slight side effect: it periodically turns him into a homicidal killer who is seized with the urge to strangle his victims.
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