Cast 23

1. 

   Basil Rathbone

   Sherlock Holmes

2. 

   Nigel Bruce

   Doctor Watson

3. 

   Marjorie Lord

   Nancy Partridge

4. 

   Henry Daniell

   William Easter

5. 

   George Zucco

   Heinrich Hinckel aka Richard Stanley

6. 

   John Archer

   Naval Lt. Pete Merriam

7. 

   Gavin Muir

   Mr. Lang, government agent

8. 

   Edmund MacDonald

   Detective Lt. Grogan

9. 

   Don Terry

   Howe

10. 

    Mary Gordon

    Mrs. Hudson

11. 

    Bradley Page

    Cady

12. 

    Clarence Muse

    George

13. 

    Mary Forbes

    Mrs. Pettibone

14. 

    Holmes Herbert

    Mr. Ahrens

15. 

    Thurston Hall

    Sen. Henry Babcock

16. 

    Ian Wolfe

    Antiques Store Sales Clerk

17. John Burton

    Army Inspector (uncredited)

18. 

    Gerald Hamer

    Alfred Pettibone

19. 

    Gilbert Emery

    Sir Henry Marchmont (uncredited)

20. 

    Margaret Seddon

    Miss Pringle (uncredited)

21. 

    Mary Field

    Party Pianist (uncredited)

22. 

    Colin Kenny

    Hotel Doorman (uncredited)

23. 

    Caroline Frances Cooke

    Mrs. Ruxton

Crew 13