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.
judge, medical research, murder trial, old age, penitentiary, pianist, prison guard, scientist, strangulation, garrote, father daughter relationship, murder, prison, mad scientist, aging, amnesia, autopsy, death sentence, doctor, warden
A minor Boris Karloff film, recommended for those who must have all his films in their collection.
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