Dr. Alexander Thorkel
Albert Dekker
Bill Stockton
Thomas Coley
Dr. Mary Robinson
Janice Logan
Dr. Rupert Bulfinch
Charles Halton
Steve Baker
Victor Kilian
Pedro
Frank Yaconelli
Dr. Mendoza
Paul Fix
Prof. Kendall
Frank Reicher
Woman
Jane Webb
Silent Indian
Billy Wilkerson
Producer
Merian C. Cooper
Makeup Artist
Charles Gemora
Director
Ernest B. Schoedsack
Assistant Director
Hollingsworth Morse
Dale Van Every
Screenplay
Tom Kilpatrick
Editor
Ellsworth Hoagland
Original Music Composer
Gerard Carbonara
Malcolm Stuart Boylan
Director of Photography
Henry Sharp
Set Designer
A. E. Freudeman
Sound Recordist
Richard Olson
Executive Producer
William LeBaron
Art Direction
Hans Dreier
Robert Odell
Harry Lindgren
A. Earl Hedrick
Albert Hay Malotte
Ernst Toch