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.
Sherlock Holmes
Robert Stephens
Dr. John Watson
Colin Blakely
Gabrielle Valadon
Geneviève Page
Mycroft Holmes
Christopher Lee
Madame Petrova
Tamara Toumanova
Nikolai Rogozhin
Clive Revill
Mrs. Hudson
Irene Handl
Queen Victoria
Mollie Maureen
Gravedigger
Stanley Holloway
Woman in Wheelchair
Catherine Lacey
Von Tirpitz
Peter Madden
Cabby
Michael Balfour
Guide
James Copeland
First Carter
John Garrie
Second Carter
Godfrey James
Hotel Manager
Robert Cawdron
Baggageman
Alex McCrindle
Porter
Frank Thornton
Monk
Paul Hansard
Inspector Lestrade
George Benson
Madame
Anne Blake