Basil Rathbone
Sherlock Holmes
Marjorie Riordan
Sheila Woodbury
Rosalind Ivan
Agatha Dunham
Leslie Vincent
Nikolas Watson
William 'Wee Willie' Davis
Gubek
Frederick Worlock
Prime Minister
Tom Dillon
Matthias Cherney (uncredited)
James Carlisle
Aide (uncredited)
Olaf Hytten
Stimson (uncredited)
Gordon Jackson
Steward (uncredited)