"An American newcomer to a prestigious German ballet academy comes to realize that the school is a front for something sinister amid a series of grisly murders."
Jessica Harper
as Suzy Bannion
Stefania Casini
as Sara
Flavio Bucci
as Daniel
Miguel Bosé
as Mark
Barbara Magnolfi
as Olga
Susanna Javicoli
as Sonia
Eva Axén
as Pat Hingle
Rudolf Schündler
as Prof. Milius
Udo Kier
as Dr. Frank Mandel
Alida Valli
as Miss Tanner
Joan Bennett
as Madame Blanc
Margherita Horowitz
as Teacher
Jacopo Mariani
as Albert
Fulvio Mingozzi
as Taxi Driver
Franca Scagnetti
as Cook
Renato Scarpa
as Prof. Verdegast
Serafina Scorceletti
as 2nd Cook
Giuseppe Transocchi
as Pavlo
Renata Zamengo
as Caroline
Alessandra Capozzi
as Dancer
Salvatore Capozzi
Diana Ferrara
Cristina Latini
Alfredo Raino
Claudia Zaccari
Dario Argento
as Narrator (voice) (uncredited)
Giovanni di Bernardo
as Police Inspector (uncredited)
Daria Nicolodi
as Woman at Airport (uncredited)
Marina Pierro
as Figurant (uncredited)
Lela Svasta
as Helena Markos (uncredited)
Director
Screenplay
Thomas De Quincey
Novel
Claudio Argento
Producer
Salvatore Argento
Executive Producer
Original Music Composer
Agostino Marangolo
Massimo Morante
Fabio Pignatelli
Claudio Simonetti
Luciano Tovoli
Director of Photography
Franco Fraticelli
Editor
Giuseppe Bassan
Production Design
Pierantonio Mecacci
Makeup Supervisor
Luciano Anzellotti
Sound Effects
Massimo Anzellotti
Sound Editor
Pierangelo Cicoletti
Costume Design
Davide Bassan
Assistant Art Director
Maurizio Garrone
Idelmo Simonelli
Camera Operator
Alberto Altibrandi
Gaffer
Francesco Bellomo
Still Photographer
Bertilla Silvestrin
Seamstress
Germano Natali
Special Effects
Nick Alexander
ADR & Dubbing
Mario Dallimonti
Sound Recordist
Maria Teresa Corridoni
Hairstylist
Mario Moreschini
Key Grip
Giuseppe Tinelli
Assistant Camera
Enrico Fontana
Corrado Volpicelli
Boom Operator
Federico Savina
Sound Designer