Sidney Toler

Orson Welles

Joseph Balsamo aka Count Cagliostro

Mantan Moreland

Nancy Guild

Marie Antoinette / Lorenza

Frances Chan

Akim Tamiroff

Gitano

Joseph Crehan

Frank Latimore

Gilbert de Rezel

Helen Beverly

Valentina Cortese

Zoraida

Harry Depp

Margot Grahame

Mme. du Barry

Jacqueline deWit

Stephen Bekassy

Viscount de Montagne

Geraldine Wall

Berry Kroeger

Alexandre Dumas, Sr.

Ralph Peters

Frank Jaquet

Gregory Gaye

Chambord / Monk (as Gregory Gay)

Raymond Burr

Alexandre Dumas, Jr.

Edward Earle

Claudia Dell

Charles Goldner

Dr. Franz Anton Mesmer

Lee Kresel

King Louis XVI / Innkeeper

Charles Jordon

Dick Gordon

Robert Atkins

King Louis XV

Nicholas Bruce

De Remy

Franco Corsaro

Chico

Annielo Mele

Joseph Balsamo as a Child

Ronald Adam

Court President

Bruce Belfrage

Crown Prosecutor

Alexander Danaroff

Dr. Duval / Baron von Minden

Leonardo Scavino

Gaston / Beniamino Balsamo (as Leon Lenoir)

Tamara Shayne

Maria Balsamo

Joop van Hulzen

Minister of Justice

Peter Trent

Dr. Mesmer's Friend

Giuseppe Varni

Boehmer

Tatyana Pavlova

Grieving Mother

Harriet Medin

(uncredited)

Valentino Bruchi

(uncredited)

Ludmilla Dudarova

(uncredited)

Rosina Galli

(uncredited)

Silvana Mangano

(uncredited)

Filippo Minelli

(uncredited)

Michele Sakara

(uncredited)

Nicholas Soussanin

(uncredited)

Milly Vitale

(uncredited)

Phil Rosen

Director

Gregory Ratoff

Director

Edward G. O'Callaghan

Guión

Earl Derr Biggers

Guión

Charles Bennett

Guión Adaptado

Richard Schayer

Guión Adaptado

Alexandre Dumas

Novela

Arthur Martinelli

Director de Fotografía

Ubaldo Arata

Director de Fotografía

Anchise Brizzi

Director de Fotografía

Otello Martelli

Director de Fotografía

Alexander Laszlo

Compositor de la Música Original

Paul Sawtell

Música

Gregory Ratoff

Productor

Monogram Pictures

Compañía de Produccion

Dario Sabatello

Productor Asociado

Edward Small

Productor Ejecutivo

Don L. Cash

Maquilladora

Georges Annenkov

Diseño de Vestuario

Vittorio Nino Novarese

Diseño de Vestuario

Fred R. Feitshans Jr.

Editor

James C. McKay

Editor

Renzo Lucidi

Editor

Ottavio Scotti

Dirección Artística

Jean d'Eaubonne

Dirección Artística

Gino Brosio

Decorados