Sherlock Holmes

Basil Rathbone

Acting

Doctor Watson

Nigel Bruce

Acting

Sheila Woodbury

Marjorie Riordan

Acting

Agatha Dunham

Rosalind Ivan

Acting

Steward

Morton Lowry

Acting

Nikolas Watson

Leslie Vincent

Acting

Mirko

Martin Kosleck

Acting

Gregor

Rex Evans

Acting

Jodri

John Abbott

Acting

Kingston

Gerald Hamer

Acting

Gubek

William 'Wee Willie' Davis

Acting

Prime Minister

Frederick Worlock

Acting

Matthias Cherney (uncredited)

Tom Dillon

Acting

Aide (uncredited)

James Carlisle

Acting

Stimson (uncredited)

Olaf Hytten

Acting

Steward (uncredited)

Gordon Jackson

Acting