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 (as Enio Girolami)

Marino Masé

John

Fulvio Mingozzi

Alboretto, the porter

Giampaolo Saccarola

Coroner (as Gianpaolo Saccarola)

Dario Argento

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

Lamberto Bava

Elevator Repairman #1 (uncredited)

Michele Soavi

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