Fifth Column Mouse - The Best Classic Cartoons of All Time

The short film begins with a pleasant group of brown mice who are - to the tune of "Ain't We Got Fun" - enjoying various water sports and other fun activities in and around a kitchen sink. Lurking just outside the house is a sinister cat; after he gets inside he gains the confidence of a dim-witted grey mouse who has already underestimated the predator. The cat persuades the easily manipulated rodent - via a promise of cheese, "all you want" - to impress upon the brown mice that he, the cat, is there to save them when, in actuality, he will enslave them.

The grey mouse follows the cat's orders and convinces his compatriots to appease. The brown mice indeed become slaves to the cat, fulfilling his every desire. Finally, he openly states that he wants to eat "a nice, fat, tender mouse". The brown mice flee; the grey mouse runs to join them when the cat turns his appetite toward him. The newly formed brown mouse united alliance prepares for war, constructing a 'secret weapon' to even the upcoming battle: a mechanical bulldog. The ensuing chase forces the cat from the house after being shaved nearly bald. As the brown mice celebrate the victory, the grey mouse tries to claim partial credit (quoting Red Skelton’s famous line "I Dood it"); in response, he is immediately pied.