"When a bored Sherlock eagerly takes the case of Gabrielle Valladon following an attempt on her life, the search for her missing husband leads to Loch Ness and the legendary monster."
Robert Stephens
as Sherlock Holmes
Colin Blakely
as Dr. John Watson
Geneviève Page
as Gabrielle Valadon
Christopher Lee
as Mycroft Holmes
Tamara Toumanova
as Madame Petrova
Clive Revill
as Nikolai Rogozhin
Irene Handl
as Mrs. Hudson
Mollie Maureen
as Queen Victoria
Stanley Holloway
as Gravedigger
Catherine Lacey
as Woman in Wheelchair
Peter Madden
as Von Tirpitz
Michael Balfour
as Cabby
James Copeland
as Guide
John Garrie
as First Carter
Godfrey James
as Second Carter
Robert Cawdron
as Hotel Manager
Alex McCrindle
as Baggageman
Frank Thornton
as Porter
Paul Hansard
as Monk
George Benson
as Inspector Lestrade
Anne Blake
as Madame
Billy Wilder
Director
Producer
Ernest Walter
Editor
I. A. L. Diamond
Writer
Arthur Conan Doyle
Characters
Miklós Rózsa
Original Music Composer
Christopher Challis
Director of Photography
Freddie Cooper
Camera Operator
Biddy Chrystal
Hairstylist
Ernest Gasser
Makeup Artist
Alexandre Trauner
Production Design
Roy Baker
Sound Editor
Julie Harris
Costume Design
Lesley De Pettit
Casting
Wally Veevers
Special Effects
Cliff Richardson
Tony Inglis
Art Direction
Vernon Dixon
Set Dresser
David Blair
Choreographer
Maurice Binder
Title Designer
Dudley Messenger
Sound Recordist
J. W. N. Daniel
Terry Parr
Tom Pevsner
Assistant Director
Gordon K. McCallum
Associate Producer
Eric Rattray
Production Manager
Ivo Nightingale
Location Manager
Larry DeWaay
Production Supervisor
Elaine Schreyeck
Continuity
Leon Davis
Construction Coordinator
Henry E. Lester
Other