The Invisible Mouse (1947)

Professor Jerry teaches a course in how to outwit cats, but his pupil seems to know more than Jerry.

The popular cartoon cat and mouse are thrown into a feature film. The story has the twosome trying to help an orphan girl who is being berated and exploited by a greedy guardian.

The family dog warns Tom not to make any noise so he can take a nap. Jerry hears this and immediately devises plans to ensure that the dog's nap will be interrupted.

Tom inherits $1,000,000 from an eccentric aunt on the condition that he not harm any living thing - even a mouse. And guess which mouse keeps following him around and pointing this out to him?

Tom, complete with mortarboard, is teaching a kitten the basics: "cats chase mice." But Jerry keeps subverting this lesson at every opportunity.

Jasper is given an ultimatum by his master: break one more thing and you're out. Rodent Jerry does his best to make sure that his tormentor "gets the boot".

A moment after a bottle of white shoe polish pours on Jerry, Tom hears on the radio that a white mouse, having swallowed an explosive, has escaped from an experimental laboratory and that slightest jar of the mouse could cause it to explode and blow up the entire city. It is then that Tom notices now-white Jerry and concludes it's the escapee.

Mickey and gang must stop hundreds of old film reel versions of Mickey from wreaking havoc all over town.

Tom subjects Jerry to his usual harassment; but the cat finds a new enemy, and the mouse finds a new friend, in the canary of the house.

Tom hears a ghost story on the radio and is spooked by it; Jerry notices this and takes advantage of it, using a variety of tricks to scare Tom.