Dr. Cyclops

Albert Dekker

Dr. Alexander Thorkel

Thomas Coley

Bill Stockton

Janice Logan

Dr. Mary Robinson

Charles Halton

Dr. Rupert Bulfinch

Victor Kilian

Steve Baker

Frank Yaconelli

Pedro

Paul Fix

Dr. Mendoza

Frank Reicher

Prof. Kendall

Jane Webb

Woman (uncredited)

Billy Wilkerson

Silent Indian (uncredited)

Merian C. Cooper

Producer

Dale Van Every

Producer

Ernest B. Schoedsack

Director

William LeBaron

Executive Producer