Obsada:

• Basil Rathbone Sherlock Holmes
• Nigel Bruce Dr. John H. Watson
• Marjorie Riordan Sheila Woodbury
• Rosalind Ivan Agatha Dunham
• Morton Lowry Sanford - Ship's Steward
• Leslie Vincent Nikolas Watson
• Martin Kosleck Mirko
• Rex Evans Gregor
• John Abbott Jodri
• Gerald Hamer Kingston
• William 'Wee Willie' Davis Gubec
• Frederick Worlock Prime Minister
• Wilson Benge Mr. Arnold
• Sven Hugo Borg Johansson
• James Carlisle Aide
• Ashley Cowan Steward
• James Craven Customer
• Sayre Dearing Aide
• Tom Dillon Restaurant Proprietor
• Alan Edmiston Furtive man
• Gregory Gaye Ravez
• Olaf Hytten Simpson, the Gunsmith
• Dorothy Kellogg Fuzzy looking woman
• George Leigh Reginald Dene