Man Who Changed His Mind, The (1936)

aka’s: The Man Who Lived Again/
Dr. Maniac/The Brainsnatcher

Dr. Laurence (Boris Karloff), a once-respectable scientist, begins to research the origin of the mind and the soul. The science community rejects him, and he risks losing everything for which he has worked. He begins to use his discoveries to save his research and further his own causes, thereby becoming… a Mad Scientist, nearly unstoppable! Also stars John Loder and Anna Lee.