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
Boris Karloff
Bela Lugosi
Anne Nagel
Anne Gwynne
Virginia Brissac
Edmund MacDonald
Paul Fix
Murray Alper
Jack Mulhall
Raymond Bailey
Joe King
John Kelly
Jessie Arnold
Elfriede Borodin
Tommy Conlon
Franco Corsaro
James Craig
Kernan Cripps
Eddie Dunn
Edward Earle
Harry Hayden
Frank Jaquet
Ellen Lowe
Jerry Marlowe
Jerry Marlowe
Wallace Reid Jr.
William Ruhl
Frank Sheridan
Edwin Stanley
Harry Tenbrook
Emmett Vogan
Russell Wade
Dave Willock
Victor Zimmerman
Robert Morgan