Cast 22

1. 

   Boris Karloff

   James Lee Wong

2. 

   Grant Withers

   Police Capt. Sam Street

3. 

   Maxine Jennings

   Myra Ross

4. 

   Evelyn Brent

   Olga Petroff / Countess Dubois / Sophie Dome

5. 

   George Lloyd

   Devlin

6. 

   Lucien Prival

   Anton Mohl

7. 

   John St. Polis

   Carl Roemer

8. 

   William Gould

   Theodore Meisle

9. 

   Hooper Atchley

   Christian Wilk

10. 

    John Hamilton

    Simon Dayton

11. 

    Wilbur Mack

    Russell

12. 

    Lee Tung Foo

    Tchin

13. 

    Lynton Brent

    Tommy

14. Grace Wood

    Mrs. Roemer

15. Frank Bruno

    Lescardi (uncredited)

16. 

    Ed Cassidy

    Ambulance Doctor (uncredited)

17. 

    Wheaton Chambers

    Chemistry Lab Director (uncredited)

18. 

    Clancy Cooper

    Warehouse Man (uncredited)

19. George DeNormand

    John (uncredited)

20. 

    Lester Dorr

    Coroner (uncredited)

21. 

    Herbert Evans

    Wilk's Butler (uncredited)

22. Dick Reinhart

    Dock Worker (uncredited)

Crew 15