Greer Garson

Marie Curie

Walter Pidgeon

Pierre Curie

Henry Travers

Eugene Curie

Albert Bassernan

Albert Bassermann

Professor Jean Perot

Robert Walker

David Le Gros

C. Aubrey Smith

Lord Kelvin

May Whitty

Madame Eugene Curie

Reginal Owen

Victor Francen

President of University

May Whitty

Elsa Bassermann

Madame Perot

Reginald Owen

Dr. Becquerel

Van Johnson

Reporter

Margaret O'Brien

Irene Curie - Age 5

James Hilton

Narration Spoken By (voice)

Mariska Aldrich

Tall Woman

Tony Carson

Man at Accident

Ruth Cherrington

Swedish Queen

Ray Collins

Lecturer (voice)

Guy D'Ennery

Professor

George Davis

Cart Driver

Harold De Becker

Professor

Franz Dorfler

Assistant Tailor

Justine Duney

Woman at Accident

Tay Dunn

Man at Accident

William Edmunds

Cart Driver

Nestor Eristoff

Board Member

Al Ferguson

Man at Accident

Edward Fielding

Board Member

Howard Freeman

Prof. Constant (voice)

Linda Lee Gates

Perot Granddaughter

Marie Louise Gates

Perot Granddaughter

Lisa Golm

Lucille

Ilka Grüning

Seamstress

Lumsden Hare

Professor Roget

Teddy Infuhr

Son

James Kirkwood

Board Member

Isabel La Mal

Woman at Accident

Gene Lockhart

Bit Part

Miles Mander

Businessman

George Meader

Singing Professor

Dickie Meyers

Master Michaud

Noel Mills

Wedding Guest

Leo Mostovoy

Photographer

Alan Napier

Dr. Bladh

Moroni Olsen

President of Businessman's Board

María Pagés

Woman at Accident

Gigi Perreau

Eve at 18 Months

Francis Pierlot

Monsieur Michaud

Nita Pike

Woman at Accident

Dorothy Raye

Nurse

Almira Sessions

Madame Michaud

Arthur Shields

Businessman

Wyndham Standing

King Oscar

Ray Teal

Driver

Charles Trowbridge

Board Member

Michael Visaroff

Proud Papa

Marek Windheim

Jewelry Salesman

Frederick Worlock

Businessman

Eustace Wyatt

Doctor

Mervyn LeRoy

Director

Paul Osborn

Guión, Guión Adaptado

Paul Rameau

Guión

Ève Curie

Guión

Hans Rameau

Guión Adaptado

Joseph Ruttenberg

Director de Fotografía

Herbert Stothart

Compositor de la Música Original

Sidney Franklin

Productor

Metro-Goldwyn-Mayer

Compañía de Produccion

E.J. Mannix

Productor Ejecutivo

Irene

Diseño de Vestuario, Costume Supervisor

Harold F. Kress

Editor

Cedric Gibbons

Dirección Artística