Kim Walker (Deanna Durbin) is an ambitious waitress who dreams of being on the stage. She tricks respected stage actor John Sheridan (Charles Laughton) into signing a letter of introduction. Thanks to the forged letter, Kim then wins the role of Sheridan's co-star in his next play, much to the disgust of the writer Paul Taylor (Franchot Tone).
George Blake (Formby) is a waiter with ambitions to join the Navy, although he's been rejected several times, because of a weak heart. But during an air raid he's mistaken for a sailor because he's wearing the clothes of a navy friend who's borrowed his to go to a Lock-in at a pub. George is spotted by military police who think he is AWOL and escort him back to Naval barracks. He impresses the sailors there with his songs and ukulele playing, and is recruited to play at the "Spick and Span" troop radio concert in London. Somehow, along the way, he stumbles on a group of Nazi spies using a taxidermists shop as a front, and foils their plot to blow up a British submarine, "The Firefly". He also impresses and wins the heart of Pat (Anne Firth}, the Wren he's fallen for.
A famous radio singer returns to New York City to reunite with her old friends who are unaware of who she is due to how she uses a stage name. She falls in love with a struggling song writer as well.
The young Count Georg Wolkersheim (Willy Fritsch) is sent to the Congress of Vienna to represent the interests of his country, Reuss-Schleiz-Greiz. Tensions arise between the count, his wife Melanie (Maria Holst), and their two chamberlains (Hans Moser and Theo Lingen), and when the four of them attend a court ball, Melanie leaves Georg, assumes the identity of a famous actress, and attracts the affections of Crown Prince Ludwig of Bavaria (Fred Liewehr). Georg quits the ball and returns to his lodgings to wait for his wife. Meanwhile, the two servants plot to further inflame Georg's jealousy by posing as Ludwig to commission a portrait of Melanie from the famous artist Moritz Daffinger (Egon von Jordan). The next day, however, Georg and Daffinger expose the servants' ruse, Ludwig reveals to Melanie that he has discovered her true identity, and all is forgiven.
An American World War II veteran, fulfills a promise he made to one of his dying comrades by going to Mexico to adopt his daughter. When he gets there, she turns out to not to be the little girl he had imagined but an attractive young woman. He has extreme difficulty convincing his fiancée and employers that their relationship is entirely innocent.