- Basil Rathbone
- Sherlock Holmes
- Nigel Bruce
- Doctor Watson
- Marjorie Lord
- Nancy Partridge
- Henry Daniell
- William Easter
- George Zucco
- Stanley
- John Archer
- Lt. Pete Merriam
- Gavin Muir
- Bart Lang
- Edmund MacDonald
- Detective Lt. Grogan
- Don Terry
- Howe
- Bradley Page
- Cady
- Holmes Herbert
- Mr. Ahrens
- Thurston Hall
- Senator Henry Babcock
- Lillian Bronson
- Mrs. J. Wellington Jr.
- John Burton
- Army Inspector
- Eddie Coke
- Airplane Steward
- Evelyn Cook
- Nancy's Friend at Engagement Party
- Caroline Frances Cooke
- Mrs. Ruxton
- Kernan Cripps
- Hotel Porter
- Leslie Denison
- Transport Pilot
- Dan Dowling
- Party Guest
- Gilbert Emery
- Sir Henry Marchmont
- Alice Fleming
- Mrs. Jellison
- Mary Forbes
- Mother Pettibone
- Mary Gordon
- Mrs. Hudson
- Gerald Hamer
- Alfred Pettibone aka John Grayson
- Leyland Hodgson
- Airport Official
- Colin Kenny
- Hotel Doorman
- Alexander Lockwood
- Reporter
- Charles Marsh
- Reporter
- Thomas Martin
- Waiter
- Charles Meakin
- Mr. Moore
- Irving Mitchell
- Laboratory Technician
- Clarence Muse
- George - Porter
- Gene O'Donnell
- Reporter
- Jason Robards Sr.
- Hotel Doorman
- Paul Scott
- Army Major
- Margaret Seddon
- Miss Pringle
- Bernard Sell
- Party Guest
- Lee Shumway
- Army Major at Engagement Party
- Regina Wallace
- Mrs. Partridge
- Phil Warren
- Young Officer
- Ian Wolfe
- Antique Store Clerk
- Frederick Worlock
- Radio Announcer
