Synopsis
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.
Cast

Stanley Ridges
Prof. George Kingsley / Red Cannon

Boris Karloff
Dr. Ernest Sovac

Bela Lugosi
Eric Marnay

Anne Nagel
Sunny Rogers

Anne Gwynne
Jean Sovac

Virginia Brissac
Mrs. Margaret Kingsley

Edmund MacDonald
Frank Miller

Paul Fix
William Kane

Murray Alper
Bellhop

Jack Mulhall
Bartender

Raymond Bailey
Louis Devore

Joe King
Chief of Police

John Kelly
Taxi Driver

Jessie Arnold
Nurse
Elfriede Borodin
2nd Nurse

Tommy Conlon
Student
Franco Corsaro
Club Maitre d' (uncredited)

James Craig
Reporter Ernst Gives Notes To

Kernan Cripps
Detective

Eddie Dunn
Det. Farnow

Edward Earle
Detective

Harry Hayden
Prison Doctor
Frank Jaquet
Fat Man in Bar
Ellen Lowe
Midtown Hotel Maid
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