Anthony Franciosa as Peter Neal

John Saxon as Bullmer

Daria Nicolodi as Anne

Giuliano Gemma as Detective Germani

Christian Borromeo as Gianni

Mirella D'Angelo as Tilde

Veronica Lario as Jane McKerrow

Ania Pieroni as Elsa Manni

Eva Robin's as Girl on Beach

Carola Stagnaro as Detective Altieri

John Steiner as Christiano Berti

Lara Wendel as Maria Alboretto

Isabella Amadeo as Bullmer's secretary

Mirella Banti as Marion

Ennio Girolami as Department Store Manager

Monica Maisani as

Marino Masé as John

Fulvio Mingozzi as Alboretto

Giampaolo Saccarola as Coroner

Ippolita Santarelli as Prostitute

Francesca Viscardi as

Dario Argento as Narrator / Murderer's Hands (voice) (uncredited)

Lamberto Bava as Elevator Repairman #1 (uncredited)

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