The Fifth-Column Mouse is an animated cartoon in the Merrie Melodies series from 1943. Directed by Friz Freleng, the cartoon features a band of humble mice who engage in war against a Hitler-like Cat.
The short begins with a pleasant group of mice enjoying various water sports in a kitchen sink. Lurking nearby is a sinister cat who gains the confidence of a dim-witted mouse. The cat persuades the unsuspecting rodent to tell the other mice to become the cat's slaves, and the cat promises a never-ending cheese supply in return. The mouse (who much more resembles a rat) follows the cat's orders, but he soon finds out the cat's true intentions—to make them his dinner. The mice then form a united alliance against the cat as both sides prepare for war. After battling the cat a cream is thrown at the mouse throwing him into the leg of the robot they built.
Syndication airings of this cartoon ommited the part in which the mouse refuses the cat's deal of all the cheese that the mouse wants in exchange for leading the mice population to appease the cat, but the cat forced him to accept the deal, followed by, "NOW, GET GOING!"