Full credits

On screen, in billing order

1. 1Anita Sharp-Bolster
2. 2Basil Rathboneas Sherlock Holmes
3. 3Edmund Breon
4. 4Florence Wix
5. 5Frederick Worlock
6. 6Harry Cording
7. 7Holmes Herbert
8. 8Ian Wolfe
9. 9Marjorie Bennett
10. 10Mary Gordonas Mrs. Hudson
11. 11Nigel Bruceas Dr. Watson
12. 12Patricia Morison

• Roy William Neill