Fabio Testi
Enrico Rosseni
Karin Baal
Herta Rosseni
Cristina Galbó
Elizabeth Seccles (as Christine Galbo)
Joachim Fuchsberger
Inspector Barth
Günther Stoll
Professor Bascombe
Claudia Butenuth
Brenda Pilchard
Camille Keaton
Solange Beauregard
Maria Monti
Mrs. Erickson
Giancarlo Badessi
Mr. Erickson
Pilar Castel
Janet Bryant
Giovanna Di Bernardo
Helen Edmonds
Vittorio Fanfoni
Enrico's Landlord
Marco Mariani
Father Webber
Antonio Casale
Mr. Newton (as Antony Vernon)
Emilia Wolkowicz
Ruth Holden (as Emilia Wolkowich)
Daniele Micheletti
Mr. Bryant
Antonio Anelli
Father Herbert
Rainer Penkert
Mr. Leach, the Headmaster
Carla Mancini
Susan, a Student
John Gayford
Joseph Kane (uncredited)
Alfonso Giganti
Man at Church (uncredited)
Charles Howerton
Phillip Sullivan (voice) (uncredited)
Maria Michi
Brenda's Mother (uncredited)
Alfred Vohrer
Edgar Wallace (voice) (archive footage) (uncredited)
Joe Wadham
Policeman (uncredited)
Augusta Di Vincenzi
Woman in church (uncredited)
Rory MacDonald
Phillip Sullivan (uncredited)