When the U.S. invasion and the landing of troops in 1847 begins, the former cadet Miguel de la Peña (Jorge Negrete) and his friend Agustin Melgar (Jose Macip) decide to return to the military college and fight heroically in the defense of the Mexican army.
Three mice run, cavort, sing and dance around in the stores and restaurants a big city at night. They wind up in a café for an early-morning snack and stocking up on food provisions before they return to the safety of their den beneath a man-hole cover in the street.
The Cabin Kids, in between song and dance numbers, are at the county fair with intentions, fair or foul, of helping Mammy win the Pancakes cooking contest.
In an effort to impress Darla, Alfalfa tells her that he's a famous bear trainer. Little does he know that Darla's father owns a circus - and a bear costume.