David Hemmings character Marcus Daly
Daria Nicolodi character Gianna Brezzi
Gabriele Lavia character Carlo
Macha Méril character Helga Ulmann
Eros Pagni character Supt. Calcabrini
Giuliana Calandra character Amanda Righetti
Piero Mazzinghi character Bardi
Glauco Mauri character Prof. Giordani
Clara Calamai character Marta
Aldo Bonamano character Carlo's Father
Liana Del Balzo character Elvira
Vittorio Fanfoni character Cop Taking Notes
Dante Fioretti character Police Photographer
Geraldine Hooper character Massimo Ricci
Jacopo Mariani character Young Carlo (as Iacopo Mariani)
Furio Meniconi character Rodi
Fulvio Mingozzi character Agent Mingozzi
Lorenzo Piani character Fingerprint Cop
Salvatore Puntillo character Police Agent
Piero Vida character Fat Cop
Nicoletta Elmi character Olga
Dario Argento character Murderer's Hands (uncredited)
Salvatore Baccaro character Fruit Vendor (uncredited)
Omero Capanna character Hitman (uncredited)
Bruno Di Luia character Concerned Man in Restroom (uncredited)
Attilio Dottesio character Florist (uncredited)
Tom Felleghy character Surgeon (uncredited)
Glauco Onorato character (uncredited)
Marilù Tolo character Carol (archive footage) (uncredited)
Franco Vaccaro character Pietro Valgoi (uncredited)
