| Schauspieler | Rolle | Synchronsprecher | ||
| Greer Garson | Marie Curie | Cornelia Meinhardt Cornelia Meinhardt | ||
| Walter Pidgeon | Pierre Curie | Joachim Kerzel Joachim Kerzel | ||
| Edward Fielding | Board Member | Werner Ehrlicher | ||
| Charles Trowbridge | Board Member | Horst Kempe | ||
| Robert Walker I | David Le Gros | Oliver Rohrbeck Oliver Rohrbeck | ||
| Eustace Wyatt | Doktor | Peter Groeger Peter Groeger | ||
| Ray Collins | Dozent | Werner Ehrlicher | ||
| Reginald Owen | Dr. Becquerel | Hans Teuscher | ||
| Alan Napier | Dr. Bladh | Wolfgang Lohse | ||
| Henry Travers | Eugene Curie | Gerry Wolff | ||
| Marek Windheim | Juwelier | Viktor Deiß | ||
| C. Aubrey Smith | Lord Kelvin | Friedrich W. Bauschulte | ||
| Francis Pierlot | Monsieur Michaud | Wolfgang Thal | ||
| Albert Bassermann | Prof. Jean Perot | Friedrich Schoenfelder Friedrich Schoenfelder | ||
| Howard Freeman | Professor Constant | Hasso Zorn | ||
| Lumsden Hare | Professor Roget | Wolfgang Thal | ||
| Van Johnson | Reporter | Dietmar Wunder Dietmar Wunder | ||
| Victor Francen | Universitätspräsident | Hasso Zorn | ||
| James Hilton | Erzähler | Klaus Piontek | ||
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