Robert Livingston
Dr. Lawrence Baxter
Grace Bradley
Jean Sterling
Willard Robertson
Inspector 'Mac' McDonald
Granville Bates
Prof. Rexford Sterling
Byron Foulger
Pete Andorka
Wilbur Mack
F. J. Thompson
Josephine Whittell
Nurse Nelson
Mary Russell
Nurse (uncredited)
Frank Austin
Henchman (uncredited)
Richard Beach
Henchman (uncredited)
Harrison Greene
Hospital Administrator (uncredited)
John Holland
Druggist (uncredited)
Monte Montague
Henchman (uncredited)
William H. O'Brien
Nightclub Waiter (uncredited)
Carleton Young
Radio Announcer (uncredited)
