Distributia
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Van JohnsonReporter
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Henry TraversEugene Curie
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Gigi PerreauEve (at age 18 months)
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Greer GarsonMarie Curie
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Lumsden HareProf. Roget
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Alan NapierDr. Bladh
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Albert BassermannProf. Jean Perot
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James HiltonNarator
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Arthur ShieldsBusinessman
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Frederick WorlockBusinessman
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Dame May WhittyMadame Eugene Curie
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Ray CollinsLecturer
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Miles ManderBusinessman
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Howard FreemanProf. Constant
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Al FergusonMan at accident
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C. Aubrey SmithLord Kelvin
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Ilka GrüningSeamstress
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Michael VisaroffProud papa
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Walter PidgeonPierre Curie
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Charles TrowbridgeBoard member
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Ray TealŞofer
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Edward FieldingBoard member
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Mariska AldrichTall woman
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Margaret O'BrienIrene Curie (at age 5)
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Reginald OwenDr. Becquerel
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Gene LockhartRol de o replică
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Victor FrancenPresident of University
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Elsa BassermannMadame Perot
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Margaret O'BrienIrene Curie - Age 5
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Robert WalkerDavid Le Gros