Danny Kaye headlines this lively WW II-era comedy. He plays a foot soldier who with his fellow troop is preparing for D-day. Trouble begins when he is caught pretending to be the most important generals in England, a man he closely resembles. The two look so much alike that military intelligence assign him to keep on impersonating the general so as to keep the Nazis on their toes. He is good at his job and fools many of the general's staff. He does not, however, fool the general's estranged wife. Still in order to protect her country, she goes along with the ruse. Things get really sticky when the real general is killed and Army intelligence asks Kaye to continue with the deception.