The Marx Brothers take on high society and the opera world to bring two lovers together. A sly business manager and two wacky friends of two opera singers help them achieve success while humiliating their stuffy and snobbish enemies.

It's a dreary Christmas 1944 for the American POWs in Stalag 17 and the men in Barracks 4, all sergeants, have to deal with a grave problem—there seems to be a security leak.

C.R. MacNamara is a managing director for Coca Cola in West Berlin during the Cold War, just before the Wall is put up. When Scarlett, the rebellious daughter of his boss, comes to West Berlin, MacNamara has to look after her, but this turns out to be a difficult task when she reveals to be married to a communist.

During the Nazi occupation of Poland, an acting troupe becomes embroiled in a Polish soldier's efforts to track down a German spy.