Obsada:

• Boris Karloff Dr. Janos Rukh
• Bela Lugosi Dr. Felix Benet
• Frances Drake Diane Rukh
• Violet Kemble Cooper Mother Rukh
• Walter Kingsford Sir Francis Stevens
• Beulah Bondi Lady Arabella Stevens
• Frank Reicher Professor Meiklejohn
• Paul Weigel Monsieur Noyer
• Georges Renavent Chief of the Surete
• Ernie Adams Bit part
• Ricca Allen Bystander
• Charles Bastin French Newsboy
• May Beatty Mme. LeGrand
• Ted Billings Counterman
• Ernest Bowern French Newsboy
• Helen Brown The Blind Girl's Mother
• Daisy Bufford Mother of Infant
• André Cheron Surete Official Checking Names
• Alex Chivra Cook
• Ann Marie Conte The Blind Girl
• Edwards Davis Scientist
• Jean De Briac Gendarme
• Dudley Dickerson Safari Member
• Charles Fallon Gentleman
• Constant Franke Police Detective
• Clarence Gordon Porter and Servant
• Robert Graves Gendarme
• Winter Hall The Minister
• Daniel L. Haynes Rukh's Head Bearer
• Isabel La Mal Bystander
• Francisco Marán Gendarme
• Alphonse Martell Surete Official Checking Names
• Paul McAllister Papa LaCosta
• Etta McDaniel Diane's Safari Attendant
• Walter Miller The Derelict
• Edward Reinach Scientist
• Hans Schumm The Clinic Valet
• Ynez Seabury Celeste - a Maid
• Lawrence Stewart The Runner-boy
• Adele St. Mauer Mme. Noyer
• Fred 'Snowflake' Toones Native Who First Sees Rukh Glow
• Ray Turner Bearer with Geiger Counter
• Lucio Villegas Pierre - a Butler
• Nydia Westman Briggs - a Maid
• Lloyd Whitlock Scientist