Trailer
Images
 | Leigh McCloskey as Mark Elliot |
 | Irene Miracle as Rose Elliot |
 | Eleonora Giorgi as Sara |
 | Daria Nicolodi as Elise Stallone Van Adler |
 | Sacha Pitoëff as Kazanian |
 | Alida Valli as Carol |
 | Veronica Lazăr as Nurse |
 | Gabriele Lavia as Carlo |
 | Feodor Chaliapin Jr. as Professor Arnold / Dr. Varelli |
 | Leopoldo Mastelloni as John, the Butler |
 | Ania Pieroni as Musical Student |
 | James Fleetwood as Cook |
| Rosario Rigutini as Man |
| Ryan Hilliard as Shadow |
 | Paolo Paoloni as Music Teacher |
 | Fulvio Mingozzi as Cabdriver |
| Luigi Lodoli as Bookbinder |
| Rodolfo Lodi as Old Man |
 | Dario Argento as Narrator (voice) (uncredited) |
 | Ettore Martini as Burning Building Cop (uncredited) |
 | Corinne Dunne as Tenant in New York Building (uncredited) |
 | Filippo Perego as Tenant in New York Building (uncredited) |
| Directing | |
| Dario Argento | Director |
Writing | |
| Dario Argento | Screenplay |
Sound | |
| Keith Emerson | Original Music Composer |
Production | |
| Claudio Argento | Producer |
| Salvatore Argento | Producer |
Crew | |
| Mario Bava | Thanks |
Camera | |
| Romano Albani | Director of Photography |
| Idelmo Simonelli | Camera Operator |
| Francesco Bellomo | Still Photographer |
Lighting | |
| Alberto Altibrandi | Gaffer |
Art | |
| Giuseppe Bassan | Art Direction |
| Francesco Cuppini | Set Decoration |
| Maurizio Garrone | Set Decoration |
Costume & Make-Up | |
| Massimo Lentini | Costume Design |
Crew | |
| Germano Natali | Special Effects |
Directing | |
| Serena Canevari | Script Supervisor |
Sound | |
| Attilio Gizzi | Sound Effects Editor |
Costume & Make-Up | |
| Luciana Maria Costanzi | Hairstylist |
| Giancarlo De Leonardis | Hairstylist |
| Pierantonio Mecacci | Makeup Artist |
Camera | |
| Gianlorenzo Battaglia | Underwater Camera |
Directing | |
| Mario Bava | Second Unit Director |
Editing | |
| Franco Fraticelli | Editor |
Sound | |
| Franco Groppioni | Sound Engineer |
Directing | |
| Lamberto Bava | Assistant Director |
Crew | |
| Mario Bava | Second Unit |
Writing | |
| Dario Argento | Story |
Sound | |
| Godfrey Salmon | Orchestrator |
| Godfrey Salmon | Conductor |
| Godfrey Salmon | Music Arranger |
| Keith Emerson | Music Arranger |
Production | |
| Solly V. Bianco | Administration |
| Cesare Jacolucci | Unit Manager |
| Anna Maria Galvinelli | Production Assistant |
| Michela Prodan | Production Assistant |
| Saverio Mangogna | Production Assistant |
Directing | |
| Andrea Piazzesi | Second Assistant Director |
Sound | |
| Giancarlo Laurenzi | Boom Operator |
Camera | |
| Agostino Pascarella | Key Grip |
Production | |
| Guglielmo Garroni | Executive Producer |
| Andrew W. Garroni | Production Manager |
Sound | |
| Luciano Anzellotti | Sound Effects |
| Massimo Anzellotti | Sound Effects |
| Romano Pampaloni | Sound Mixer |
Production | |
| Angelo Iacono | Production Manager |
