Elenco

• 

  Basil Rathbone

  Sherlock Holmes

• 

  Nigel Bruce

  Doctor Watson

• M

  Marjorie Lord

  Nancy Partridge

• 

  Henry Daniell

  William Easter

• 

  George Zucco

  Heinrich Hinckel aka Richard Stanley

• 

  John Archer

  Naval Lt. Pete Merriam

• 

  Gavin Muir

  Mr. Lang, government agent

• 

  Edmund MacDonald

  Detective Lt. Grogan

• 

  Don Terry

  Howe

• 

  Mary Gordon

  Mrs. Hudson