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