Two families embark on a pleasant Sunday picnic but manage to run into a variety of issues with their temperamental automobile. Each incident requires repeated exits and reboardings by Laurel, Hardy, their wives and grouchy, gout-ridden Uncle Edgar.
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.
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.
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.