Characters played by Orson Welles
Joseph Balsamo aka Count Cagliostro
Characters played by Nancy Guild
Marie Antoinette
Lorenza
Characters played by Akim Tamiroff
Gitano
Characters played by Frank Latimore
Gilbert de Rezel
Characters played by Valentina Cortese
Zoraida
Characters played by Margot Grahame
Mme. du Barry
Characters played by Stephen Bekassy
Viscount de Montagne
Characters played by Berry Kroeger
Alexandre Dumas
Sr.
Characters played by Gregory Gaye
Chambord
Monk
Characters played by Raymond Burr
Alexandre Dumas
Jr.
Characters played by Charles Goldner
Dr. Franz Anton Mesmer
Characters played by Lee Kresel
King Louis XVI
Innkeeper
Characters played by Robert Atkins
King Louis XV
Characters played by Nicholas Bruce
De Remy
Characters played by Franco Corsaro
Chico
Characters played by Annielo Mele
Joseph Balsamo - as a child
Characters played by Ronald Adam
Court President
Characters played by Bruce Belfrage
Crown Prosecutor
Characters played by Alexander Danaroff
Dr. Duval
Baron von Minden
Characters played by Leonardo Scavino
Gaston
Beniamino Balsamo
Characters played by Tamara Shayne
Maria Balsamo
Characters played by Joop van Hulzen
Minister of Justice
Characters played by Peter Trent
Dr. Mesmer's Friend
Characters played by Giuseppe Varni
Boehmer
Characters played by Tatyana Pavlova
The Mother
Characters played by Harriet Medin
(as Harriet White Medin)
Characters played by Valentino Bruchi
(uncredited)
Characters played by Renato Casanova
(uncredited)
Characters played by Ludmilla Dudarova
(uncredited)
Characters played by Rosina Galli
(uncredited)
Characters played by Mary Genni
(uncredited)
Characters played by Silvana Mangano
(uncredited)
Characters played by Filippo Minelli
(uncredited)
Characters played by Count Orloff
(uncredited)
Characters played by Maria Antonietta Pavese
(uncredited)
Characters played by Michele Sakara
(uncredited)
Characters played by Nicholas Soussanin
(uncredited)
Characters played by Princess Vassileikof
(uncredited)
Characters played by Milly Vitale
(uncredited)
Characters played by Prince Volkonski
(uncredited)
Characters played by Baroness Vredeun
(uncredited)