| Cast list | | Paul Newman | as | Professor Michael Armstrong | | Julie Andrews | as | Dr. Sarah Louise Sherman | | Lila Kedrova | as | Countess Kuchinska | | Hansjörg Felmy | as | Heinrich Gerhard (as Hansjoerg Felmy) | | Tamara Toumanova | as | Ballerina | | Wolfgang Kieling | as | Hermann Gromek | | Ludwig Donath | as | Professor Gustav Lindt | | Günter Strack | as | Professor Karl Manfred | | Gisela Fischer | as | Dr. Koska | | Mort Mills | as | Farmer | | Carolyn Conwell | as | Farmer's Wife | | Arthur Gould-Porter | as | Freddy | | Gloria Gorvin | as | Fräulein |
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