Antonio Margheriti

Director

Barbara Steele

Helen Karnstein / Mary Karnstein

George Ardisson

Baron Kurt Hummel

Halina Zalewska

Elizabeth Hummel / Adele Karnstein

Umberto Raho

Von Klage

Laura Nucci

Grumalda

Giuliano Raffaelli

Count Humboldt

Nello Pazzafini

Monk

Aldo Barozzi

Plague Victim (uncredited)