| Walter Pidgeon | Col. Michael S. ''Hooky'' Nicobar |
| Ethel Barrymore | Mother Superior |
| Peter Lawford | Major John ''Twingo'' McPhimister |
| Angela Lansbury | Audrey Quail |
| Janet Leigh | Olga Alexandrova/Maria Buhlen |
| Louis Calhern | Colonel Piniev |
| Francis L. Sullivan | Colonel Humphrey ''Blinker'' Omicron |
| Melville Cooper | Private David Moonlight |
| Robert Coote | Brigadier C.M.V. Catlock |
| Alan Napier | The General |
| Roman Toporow | 2nd Lt. Maxim Omansky |
| Konstantin Shayne | Professor Serge Bruloff |
| Janine Perreau | Mickey Mouse |
| Audrey Long | |
| Tito Vuolo | Italian Billposter (uncredited) |
| Argentina Brunetti | Italian Woman (uncredited) |
Assigned to repatriate Soviet nationals from Vienna after World War II, Col. Michael S. Nicobar and his aides, Maj. John McPhimister and Audrey Quail, relocate from Rome to carry out their mission. The three stay in a convent headed by a Mother Superior who happens to be protecting Maria Buhlen, a Soviet ballerina wanted by the authorities. Soon, Nicobar questions his duty when he and McPhimister fall for Buhlen.
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