University professor George Kingsley is struck by gangsters while crossing the street, leaving him with brain damage and one of the gangsters, Cannon, paralyzed. Kingsley's friend Dr. Sovac attends to both men, and when Cannon offers him a reward for aiding his recovery, Kovac transplants part of Cannon's brain into the dying Kingsley's skull, creating a dual personality.

Stanley Ridges
as Prof. George Kingsley / Red Cannon

Boris Karloff
as Dr. Ernest Sovac

Bela Lugosi
as Eric Marnay

Anne Nagel
as Sunny Rogers

Anne Gwynne
as Jean Sovac

Virginia Brissac
as Mrs. Margaret Kingsley

Edmund MacDonald
as Frank Miller

Paul Fix
as William Kane

Murray Alper
as Bellhop

Jack Mulhall
as Bartender
JPV852
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....
CinemaSerf
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 to demonstrate quite a few of t...