Hairballs

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.

Mammy Two-Shoes replaces Tom with a younger cat who is a lightning-quick mouser. Tom and Jerry form an alliance in order to get rid of this dangerous newcomer.

Mammy Two-Shoes tells Tom and Butch that the cat who gets rid of the icebox-raiding, breadbox-invading mouse (Jerry) is the one who can stay.

When Tom's harassment gets out of hand, Jerry writes to his Cousin Muscles, a tough inner city mouse, and asks for his help.

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