Characters played by Greer Garson
Marie Curie
Characters played by Walter Pidgeon
Pierre Curie
Characters played by Henry Travers
Eugene Curie
Characters played by Albert Bassermann
Professor Jean Perot
Characters played by Robert Walker
David Le Gros
Characters played by C. Aubrey Smith
Lord Kelvin
Characters played by May Whitty
Madame Eugene Curie
Characters played by Victor Francen
President of University
Characters played by Elsa Bassermann
Madame Perot
Characters played by Reginald Owen
Dr. Becquerel
Characters played by Van Johnson
Reporter
Characters played by Margaret O'Brien
Irene Curie - Age 5
Characters played by James Hilton
Narration Spoken By
Characters played by Mariska Aldrich
Tall Woman
Characters played by Tony Carson
Man at Accident
Characters played by Ruth Cherrington
Swedish Queen
Characters played by Ray Collins
Lecturer
Characters played by Guy D'Ennery
Professor
Characters played by George Davis
Cart Driver
Characters played by Harold De Becker
Professor
Characters played by Franz Dorfler
Assistant Tailor
Characters played by Justine Duney
Woman at Accident
Characters played by Tay Dunn
Man at Accident
Characters played by William Edmunds
Cart Driver
Characters played by Nestor Eristoff
Board Member
Characters played by Al Ferguson
Man at Accident
Characters played by Edward Fielding
Board Member
Characters played by Howard Freeman
Prof. Constant
Characters played by Linda Lee Gates
Perot Granddaughter
Characters played by Marie Louise Gates
Perot Granddaughter
Characters played by Lisa Golm
Lucille
Characters played by Ilka Grüning
Seamstress
Characters played by Lumsden Hare
Professor Roget
Characters played by Teddy Infuhr
Son
Characters played by James Kirkwood
Board Member
Characters played by Isabel La Mal
Woman at Accident
Characters played by Gene Lockhart
Bit Part
Characters played by Miles Mander
Businessman
Characters played by George Meader
Singing Professor
Characters played by Dickie Meyers
Master Michaud
Characters played by Noel Mills
Wedding Guest
Characters played by Leo Mostovoy
Photographer
Characters played by Alan Napier
Dr. Bladh
Characters played by Moroni Olsen
President of Businessman's Board
Characters played by Maria Page
Woman at Accident
Characters played by Gigi Perreau
Eve at 18 Months
Characters played by Francis Pierlot
Monsieur Michaud
Characters played by Nita Pike
Woman at Accident
Characters played by Dorothy Raye
Nurse
Characters played by Almira Sessions
Madame Michaud
Characters played by Arthur Shields
Businessman
Characters played by Wyndham Standing
King Oscar
Characters played by Count Stefenelli
Conference Guest
Characters played by Ray Teal
Driver
Characters played by Charles Trowbridge
Board Member
Characters played by Michael Visaroff
Proud Papa
Characters played by Marek Windheim
Jewelry Salesman
Characters played by Frederick Worlock
Businessman
Characters played by Eustace Wyatt
Doctor