Cast
Orson Welles
Joseph Balsamo aka Count Cagliostro
Peter Trent
Dr. Mesmer's Friend
Milly Vitale
(uncredited)
Leonardo Scavino
Gaston / Beniamino Balsamo (as Leon Lenoir)
Harriet Medin
(uncredited)
Ronald Adam
Court President
Bruce Belfrage
Crown Prosecutor
Tatyana Pavlova
Grieving Mother
Valentina Cortese
Zoraida
Berry Kroeger
Alexandre Dumas, Sr.
Robert Atkins
King Louis XV
Ludmilla Dudarova
(uncredited)
Frank Latimore
Gilbert de Rezel
Raymond Burr
Alexandre Dumas, Jr.
Nancy Guild
Marie Antoinette / Lorenza
Rosina Galli
(uncredited)
Gregory Gaye
Chambord / Monk (as Gregory Gay)
Tamara Shayne
Maria Balsamo
Akim Tamiroff
Gitano
Margot Grahame
Mme. du Barry
Stephen Bekassy
Viscount de Montagne
Silvana Mangano
(uncredited)