cast
- Orson Welles
- Cagliostro
- Nancy Guild
- Lorenza, Marie Antoinette
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- Akim Tamiroff
- Gitano
- Frank Latimore
- Gilbert
- Valentina Cortese
- Zoraida
- Margot Grahame
- Mme. Dubarry
- Stephen Bekassy
- DeMontagne
- Berry Kroeger
- Alexandre Dumas, Sr.
- Raymond Burr
- Alexandre Dumas, Jr.
- Charles Goldner
- Dr. Mesmer
- Lee Kresel
- Louis XVI
- Robert Atkins
- Louis XV
- Nicholas Bruce
- De Remy
- Franco Corsaro
- Chico
- Aniello Mele
- Joseph Balsamo, as a child
- Ronald Adam
- Court President
- Bruce Belfrage
- Crown Prosecutor
- Tamara Shayne
- Maria Balsamo
- Peter Trent
- Dr. Mesmer's Friend
- Giuseppe Varni
- Bochmer
- Gregory Gaye
- Chambord
crew
- Gregory Ratoff
- Director, Producer
- Edward Small
- Producer
- Charles Bennett
- Screenwriter
- Anchise Brizzi
- Cinematographer
- Ubaldo Arata
- Cinematographer
- Paul Sawtell
- Composer (Music Score)
- Fred R. Feitshans, Jr.
- Editor
- James McKay
- Editor
- Alexandre Dumas
- Short Story Author
