Orson Welles
Joseph Balsamo aka Count Cagliostro
Nancy Guild
Marie Antoinette / Lorenza
Gregory Gaye
Chambord / Monk (as Gregory Gay)
Lee Kresel
King Louis XVI / Innkeeper
Annielo Mele
Joseph Balsamo as a Child
Alexander Danaroff
Dr. Duval / Baron von Minden
Leonardo Scavino
Gaston / Beniamino Balsamo (as Leon Lenoir)