Disappointing movie if only because Karloff and Lugosi do not share a single scene together and they pretty much play second and third fiddle to Stanley Ridges who was okay in a dual role. Otherwise a bland movie.

Stanley Ridges ("Prof. Kingsley") is seriously ill when Boris Karloff ("Dr. Sovac") performs a highly unethical operation to replace his brain with that of gangster "Red Cannon". Though successful in prolonging his friend's life, the newly invigorated Professor begins t...