Klaus Kinski

Dr. Francis Clay

Rosalba Neri

Anne Palmieri

Jane Garret

Mara

Margaret Lee

Cheryl Hume

John Karlsen

Professor Osterman

Gioia Desideri

Ruth

Giangiacomo Elia

The Gardener (as John Ely)

Monica Strebel

Nurse Helen

Fernando Cerulli

Chaffeur

Giulio Baraghini

Policeman

Sandro Rossi

Policeman

Ettore Geri

Inspector

Antonio Radaelli

Policeman

Carla Mancini

Nurse

Franco Marletta

Male Nurse

Piero Nistri

Cheryl's Husband

Daniela Di Bitonto

Patient

Enzo Spitaleri

Ruth's Husband

Marco Mariani

Male Nurse

Gilberto Galimberti

Policeman

Rosanna Braida

Patient

Lina Franchi

Nurse Killed with Scythe (uncredited)