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.
When his friend Professor Kingsley is at deaths door, brain surgeon Dr. Sovac saves his life by means of an illegal operation that transplants part of injured gangster Red Cannon's brain. Unfortunately, the operation has a disastrous Jeckll and Hyde side effect and under certain conditions the persona of Cannon emerges. Sovac soon learns of the duel personality and of half a million dollars the gangster has hidden away. He attempts to find the money through the manipulation of his friend, an attempt that brings Kingsley closer to madness as he alternates between a meek professor of English and a brutal gangster out for murderous revenge on those who tried to kill him. Written by
Carlos Valverde <firstname.lastname@example.org>
In order to save a friend's life (Ridges), Dr. Ernest Sovac (Karloff) must perform a "brain transplantation" using the brain from a gangster (also played by Ridges). It is an illegal operation and one that has horrifying results. I must admit I had a hard time getting past the idea that a man who had a brain transplant would make up and still be himself (and not the person whose brain he now had), but once I did I enjoyed all the wonderful melodramatic hooey. Karloff is great in his role as the caring doctor with a sinister motive for saving his friend's life and Lugosi is super in his unusual role as a gangster (despite his European accents). But Stanley Ridges stole this show and did a perfect job with his Jekyll and Hyde personas.
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