The machine that transfers brains is a staple of science fiction to the point of being camp or cliché, but this is probably the first time the idea was used on film. Karloff plays a mad scientist who invents the device, demonstrating it on a pair of chimps. A British newspaper mogul bankrolls his research, only to find his mind exchanged for the mad doctor's crippled lab assistant.
Karloff's performance is what makes this movie. He returned to the United Kingdom after his initial success in Hollywood and made a series of low-budget horror films, of this was probably one of the best of the lot. Nowhere near the quality of Universal.
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