Helen Karnstein / Mary Karnstein
Baron Kurt Humboldt
Lisabeth Karnstein / Adele Karnstein
Von Klage, the Priest (as Robert Rains)
Grumalda (as Laureen Nuyen)
Count Humboldt (as Jean Rafferty)
Monk, the Servant (as John Carey)
the Messenger
Plague Victim (uncredited)
Party Guest (uncredited)
Wife of Plague Victim (uncredited)
Villager at the Execution (uncredited)
Baron Von Letz (uncredited)