Cast

• Tina Spooner Twin
• Judy Spooner Twin
• Willie Shearer Submarine Crewman
• Miklós Rózsa Orchestra Conductor
• Phillip Ross McKellar
• Daphne Riggs Lady-in-Waiting
• Kynaston Reeves Old Man
• Anna Matisse Girl
• John Scott Martin Scientist
• Wendy Lingham Girl
• Teddy Kiss Atom Submarine Crewman
• Annette Kerr Secretary
• Sheena Hunter Girl
• Marilyn Head Girl
• Ismed Hassan Submarine Crewman
• John Gatrell Equerry
• Christopher Gable Danseur Nobel
• Eric Francis Gravedigger #2
• Michael Elwyn Cassidy
• Ina De La Haye Petrova's Maid
• Martin Carroll Scientist
• Penny Brahms Girl
• Anne Blake Madame
• George Benson Inspector Lestrade
• Kenneth Benda Minister
• Christopher Beeching Male Dancer trying to seduce Watson
• Charlie Young Atom Submarine Crewman
• Graham Armitage Wiggins
• Philip Anthony Lieutenant Commander
• Paul Hansard Monk
• Frank Thornton Porter
• Alex McCrindle Baggageman
• Robert Cawdron Hotel Manager
• Godfrey James Second Carter
• John Garrie First Carter
• James Copeland Guide
• Michael Balfour Cabby
• Peter Madden Von Tirpitz
• Catherine Lacey Woman in Wheelchair
• Stanley Holloway Gravedigger
• Mollie Maureen Queen Victoria
• Irene Handl Mrs. Hudson
• Clive Revill Rogozhin
• Tamara Toumanova Madame Petrova
• Christopher Lee Mycroft Holmes
• Geneviève Page Gabrielle Valladon
• Colin Blakely Dr. Watson
• Robert Stephens Sherlock Holmes

Writers

• Arthur Conan Doyle
• Billy Wilder
• I.A.L. Diamond

Producers

• I.A.L. Diamond
• Billy Wilder