Bande-annonce
Distribution
Charles Trowbridge
Board Member (uncredited)
Albert Bassermann
Professor Jean Perot
Reginald Owen
Dr. Becquerel
George Davis
Cart Driver (uncredited)
James Kirkwood
Board Member (uncredited)
George Meader
Singing Professor (uncredited)
Van Johnson
Reporter
William Edmunds
Cart Driver (uncredited)
Almira Sessions
Madame Michaud (uncredited)
Al Ferguson
Man at Accident (uncredited)
Lisa Golm
Lucille (uncredited)
Lumsden Hare
Professor Roget (uncredited)
Walter Pidgeon
Pierre Curie
Victor Francen
President of University
Howard Freeman
Prof. Constant (voice) (uncredited)
Alan Napier
Dr. Bladh (uncredited)
Ray Teal
Driver (uncredited)
Henry Travers
Eugene Curie
Miles Mander
Businessman (uncredited)
Michael Visaroff
Proud Papa (uncredited)
Margaret O'Brien
Irene Curie - Age 5
Moroni Olsen
President of Businessman's Board (uncredited)
María Pagés
Woman at Accident (uncredited)
Arthur Shields
Businessman (uncredited)
Gigi Perreau
Eve at 18 Months (uncredited)
Francis Pierlot
Monsieur Michaud (uncredited)
Edward Fielding
Board Member (uncredited)
Robert Walker
David Le Gros
Elsa Bassermann
Madame Perot
Gene Lockhart
Bit Part (uncredited)
Eustace Wyatt
Doctor (uncredited)
C. Aubrey Smith
Lord Kelvin
Greer Garson
Marie Curie
Teddy Infuhr
Son (uncredited)
Ruth Cherrington
Swedish Queen (uncredited)
Isabel La Mal
Woman at Accident (uncredited)
May Whitty
Madame Eugene Curie
Wyndham Standing
King Oscar (uncredited)
Ray Collins
Lecturer (voice) (uncredited)
Guy D'Ennery
Professor (uncredited)
Marek Windheim
Jewelry Salesman (uncredited)
Frederick Worlock
Businessman (uncredited)
James Hilton
Narration Spoken By (voice)
Ilka Grüning
Seamstress (uncredited)