Anthony Franciosa

Peter Neal

John Saxon

Bullmer

Daria Nicolodi

Anne

Giuliano Gemma

Detective Germani

Christian Borromeo

Gianni

Mirella D'Angelo

Tilde

Veronica Lario

Jane McKerrow

Ania Pieroni

Elsa Manni

Eva Robin's

Girl on Beach

Carola Stagnaro

Detective Altieri

John Steiner

Christiano Berti

Lara Wendel

Maria Alboretto

Isabella Amadeo

Bullmer's secretary

Mirella Banti

Marion

Ennio Girolami

Department Store Manager

Monica Maisani

Marino Masé

John

Fulvio Mingozzi

Alboretto

Giampaolo Saccarola

Coroner

Ippolita Santarelli

Prostitute

Francesca Viscardi

Dario Argento

Narrator / Murderer's Hands (voice) (uncredited)

Lamberto Bava

Elevator Repairman #1 (uncredited)

Michele Soavi

Maria's Boyfriend / Man with Girl on Beach (uncredited)