"When several women are found mutilated and murdered, the Paris police are baffled as to who the killer may be. All evidence points to Dupin, but soon it becomes apparent that it is someone (or something) stronger and deadlier than a human."
Karl Malden
as Dr. Marais
Claude Dauphin
as Insp. Bonnard
Patricia Medina
as Jeanette
Steve Forrest
as Prof. Paul Dupin
Allyn Ann McLerie
as Yvonne (as Allyn McLerie)
Anthony Caruso
as Jacques the One-Eyed
Veola Vonn
as Arlette
Dolores Dorn
as Camille
Merv Griffin
as Georges Brevert
Paul Richards
as Rene the Knife-thrower
Rolfe Sedan
as LeBon (as Rolphe Sedan)
Erin O'Brien-Moore
as Wardrobe Woman
Henry Kulky
as Maurice
Abdullah Abbas
as Show Spectator (uncredited)
Rico Alaniz
as Gendarme (uncredited)
Fred Aldrich
as Barfly (uncredited)
Monya Andre
Larry Arnold
Richard Avonde
as Vendor (uncredited)
Baynes Barron
as Circus Manager (uncredited)
Max Barwyn
as Concierge (uncredited)
Herman Belmonte
Joan Blair
as Lodger (uncredited)
Marie Blake
as Marie (uncredited)
Nan Boardman
as Camille's Mother (uncredited)
Nina Borget
as Tenant (uncredited)
Chet Brandenburg
as Sailor (uncredited)
Paul Brinegar
as Angry Accuser in Street (uncredited)
Virginia Brissac
as Well-Dressed Woman in Coach (uncredited)
Buck Bucko
as Murder Scene Spectator (uncredited)
Gordon Carveth
Charles Cirillo
as Waiter (uncredited)
Edward Colmans
as Well-Dressed Man in Coach (uncredited)
Henry Corden
as Detective Mignaud (uncredited)
Chuck Couch
as Trampoline Artist (uncredited)
Walter Coy
as Gendarme Arnot (uncredited)
Paul Cristo
Jane Crowley
George Davis
as Man Who Finds Knife (uncredited)
Helen Dickson
as Concierge's Wife (uncredited)
Claire Du Brey
as Spectator (uncredited)
Billy Engle
Joe Evans
Raoul Freeman
Charles Gemora
as Sultan the Gorilla (uncredited)
John Gifford
Joe Gilbert
Dolores Graham
as Apache Dancer (uncredited)
Don Graham
Creighton Hale
as Concierge's Husband (uncredited)
Sam Harris
Tom Hernández
as Gendarme Lara (uncredited)
Mary Lou Holloway
as Girl (uncredited)
Charles Horvath
as Sailor #1 (uncredited)
Robert Hunter
Fred Kelsey
as Crowd Spectator (uncredited)
Jack Kenny
as Maurice - Sailor (uncredited)
Frank Lackteen
as Gendarme Chavet (uncredited)
Carl M. Leviness
George J. Lewis
as Gendarme Duval (uncredited)
Hank Mann
as Coachman (uncredited)
John Marlin
as Ape (uncredited)
Louis Merrill
as Pedestrian (uncredited)
John Merton
as Animal Keeper (uncredited)
Carl Milletaire
as Artist (uncredited)
Belle Mitchell
George Nardelli
Anton Northpole
Artie Ortego
John Parrish
as Bartender (uncredited)
Leonard Penn
as Gendarme Dumas (uncredited)
Paul Ravel
Edna Ryan
as Dancer (uncredited)
Sam Savitsky
George Selk
as Lamplighter (uncredited)
Allen D. Sewall
Bert Stevens
James Stone
Ruth Swanson
as Middle-Aged Woman (uncredited)
Jack Tesler
Nick Thompson
as Man (uncredited)
Louis Tomei
as Albert (voice) (uncredited)
Arthur Tovey
Tito Vuolo
as Pignatelli - Tenant (uncredited)
Tom Wilson
Jack Wise
David Buttolph
Original Music Composer
Harold Medford
Writer
James R. Webb
Roy Del Ruth
Director
J. Peverell Marley
Director of Photography
Henry Blanke
Producer
Edgar Allan Poe
Short Story
James Moore
Editor
Bertram Tuttle
Art Direction
William L. Kuehl
Set Decoration
Gordon Bau
Makeup Artist
Frank Mattison
Assistant Director
Stanley Jones
Sound
Walter Feldman
Sound Editor
Dale Pickett