"A child conceived by a mute servant girl transforms from an innocent youth to a killer beast at night with uncontrollable urges."
Clifford Evans
as Don Alfredo Corledo
Oliver Reed
as Leon Corledo
Yvonne Romain
as Servant Girl
Catherine Feller
as Cristina
Anthony Dawson
as The Marques Siniestro
Josephine Llewellyn
as The Marquesa
Richard Wordsworth
as The Beggar
Hira Talfrey
as Teresa
Justin Walters
as Young Leon
John Gabriel
as The Priest
Warren Mitchell
as Pepe Valiente
Anne Blake
as Rosa Valiente
George Woodbridge
as Dominique
Michael Ripper
as Old Soak
Ewen Solon
as Don Fernando
Peter Sallis
as Don Enrique
Martin Matthews
as Jose
David Conville
as Rico Gomez
Denis Shaw
as Gaoler
Charles Lamb
as Chef
Serafina Di Leo
as Senora Zumara
Sheila Brennan
as Vera
Joy Webster
as Isabel
Renny Lister
as Yvonne
John Adams
as Bar Customer (uncredited)
Kitty Atwood
as Midwife (uncredited)
John Bennett
as Policeman (uncredited)
Hamlyn Benson
as Landlord (uncredited)
Ray Browne
as Official (uncredited)
Rodney Burke
as 1st Customer (uncredited)
Max Butterfield
as Cheeky Farmer (uncredited)
Loraine Carvana
as Servant Girl as Child (uncredited)
Jimmy Charters
as Villager (uncredited)
Francis de Wolff
as Bearded Customer (uncredited)
Richard Golding
as 3rd Customer (uncredited)
Victor Harrington
as Cantina Patron (uncredited)
Hubert Hill
as Angry Mob (uncredited)
Howard Lang
as Irate Farmer (uncredited)
Michael Lewis
as Page (uncredited)
Desmond Llewelyn
as 1st Footman (uncredited)
Don McMurray
as Servant (uncredited)
George Mossman
as Coach Driver (uncredited)
Alan Paige
as 2nd Customer (uncredited)
Michael Peake
as Farmer in Cantina (uncredited)
Bill Rooney
as Patron (uncredited)
Stephen Scott
as Another Farmer (uncredited)
Frank Sieman
as Gardener (uncredited)
George Spence
Emile Stemmler
as Cook (uncredited)
Gordon Whiting
as 2nd Footman (uncredited)
Alister Williamson
Fred Wood
as Angry Villager (Bottom Left) in Assembled Mob (uncredited)
Terence Fisher
Director
Anthony Hinds
Producer
Michael Carreras
Executive Producer
Benjamin Frankel
Original Music Composer
Arthur Grant
Director of Photography
Alfred Cox
Editor
Bernard Robinson
Production Design
Anthony Nelson Keys
Associate Producer
Screenplay
Guy Endore
Novel
Roy Ashton
Makeup Artist
Clifford Parkes
Production Manager
Don Mingaye
Art Direction