Cast
- Orson Welles as Cagliostro
- Nancy Guild as Marie Antoinette
- Nancy Guild as Lorenza
- Akim Tamiroff as Gitano
- Frank Latimore as Gilbert
- Valentina Cortese as Zoraida
- Margot Grahame as Mme. DuBarry
- Stephen Bekassy as DeMontagne
- Berry Kroeger as Dumas, Sr.
- Raymond Burr as Dumas, Jr.
- Gregory Gaye as Chambord
- Gregory Gaye as Monk
Crew
- Gregory Ratoff · Director
- Alexandre Dumas · Writer
- Charles Bennett · Writer
- Richard Schayer · Writer
- Gregory Ratoff · Producer
- Paul Sawtell · Composer
- Ubaldo Arata · Cinematographer
- Anchise Brizzi · Cinematographer
- Fred R. Feitshans Jr. · Editor
- James C. McKay · Editor