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

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)

Francesca Viscardi

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)