Spike the bulldog, grateful to Jerry for getting him out of the dogcatcher's van, offers to help the little mouse any time he whistles. Tom, Jerry's feline tormentor, seeks to overcome this new disadvantage.
Tom heads for a big city penthouse to become acquainted with a rich pretty female cat that lives there. He brings her Jerry as a gift and does some humiliating things to Jerry. Jerry, in turn, attracts the attention of another cat who also becomes interested in the female cat. It eventually turns into a fight between Tom and the other cat for the lady's hand but Jerry is the one who gets her in the end.
Schoolboy Donald is torn between his angel and devil sides, though in Donald's case, the devil side isn't hard to resist. But the smoking he's encouraged to do turns him green and gives him regrets, and when the good side shows up and kicks evil's butt, Donald cheers.
As Tom and Jerry stage their typical fight sequences, the patriotic soldier theme of the title is evidenced by such things as a carton of eggs labeled "Hen Grenades"; Jerry dropping light bulbs from an airplane like bombs; and Jerry sending a telegram with the message "Sighted Cat - Sank Same." Musical phrasings from various patriotic war songs are heard throughout. The cut scene after Jerry hitting Tom with the board 4 times was cut from the 1950 reissue print for a war bond joke, and the original footage is currently considered "lost" due to the negatives destroyed in the 1978 George Eastman House fire.
Donald's sister Dumbella sends her three sons Huey, Dewey, and Louie to visit their uncle Donald. They prove to be quite a handful for Donald, even with help from his book on child rearing.