- Friday, May 21, 1971
- 1 hr 52 min
- Suspense/Thriller
Cast
- Karl Malden
- Franco Arno
- James Franciscus
- Carlo Giordani
- Catherine Spaak
- Anna Terzi
- Carlo Alighiero
- Dr. Calabresi
- Pier Paolo Capponi
- Police Superintendent Spimi
- Corrado Olmi
- Morsella
- Tino Carraro
- Prof. Terzi
- Horst Frank
- Dr. Braun
- Tom Felleghy
- Dr. Esson
- Rada Rassimov
- Bianca Merusi
- Cinzia de Carolis
- Lori
- Werner Pochath
- Manuel
- Aldo Reggiani
- Dr. Casoni
- Vittorio Congia
- Righetto
- Emilio Marchesini
- Dr. Mombelli
Crew
- Dario Argento
- Director, Screen Story, Screenwriter
- Bruno Nicolai
- Conductor
- Carlo Leva
- Art Director, Costume Designer
- Carlo Leva
- Art Director, Costume Designer
- Dardano Sacchetti
- Screen Story
- Dario Argento
- Director, Screen Story, Screenwriter
- Dario Argento
- Director, Screen Story, Screenwriter
- Ennio Morricone
- Composer (Music Score)
- Erico Menczer
- Cinematographer
- Franco Fraticelli
- Editor
- Luciano Vittori
- Special Effects
- Luigi Collo
- Screen Story
- Roberto Pariante
- First Assistant Director
- Salvatore Argento
- Producer