Leigh McCloskey

Mark Elliot

Irene Miracle

Rose Elliot

Eleonora Giorgi

Sara

Daria Nicolodi

Elise Stallone Van Adler

Sacha Pitoëff

Kazanian

Alida Valli

Carol

Veronica Lazăr

Nurse

Gabriele Lavia

Carlo

Feodor Chaliapin Jr.

Professor Arnold / Dr. Varelli

Leopoldo Mastelloni

John, the Butler

Ania Pieroni

Musical Student

Paolo Paoloni

Music Teacher

Fulvio Mingozzi

Cabdriver

Dario Argento

Narrator (voice) (uncredited)

Ettore Martini

Burning Building Cop (uncredited)

Corinne Dunne

Tenant in New York Building (uncredited)

Filippo Perego

Tenant in New York Building (uncredited)