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)
Ippolita Santarelli
Prostitute
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)