Discover
Robert Livingston
Dr. Lawrence Baxter
Grace Bradley
Jean Sterling
Willard Robertson
Inspector 'Mac' McDonald
Pierre Watkin
Kennedy
Smiley Burnette
Jimmy
Granville Bates
Prof. Rexford Sterling
William Newell
Andrews
Byron Foulger
Pete Andorka
Wilbur Mack
F. J. Thompson
Matty Fain
Burke
Josephine Whittell
Nurse Nelson
Charles Timblin
Swain
Billy Griffith
Kellogg
William Hopper
Announcer
Frank Du Frane
Golden
Mary Russell
Nurse (uncredited)
Directing
Irving Pichel
Director
Directing
Irving Pichel
Director