The Fifth-Column Mouse

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.

Synopsis
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.