While he may be able to scare the crows, Tom finds guarding Mrs. Twoshoes' summer garden against Jerry and his hungry kin to be a fruitless task. The tables are turned when Jerry's attempts at a peaceful picnic are undermined by Tom and one clever little ant. Butch indoctrinates Tom into the League of Cats, an organization that helps cats catch mice, but they get into a musical rumble with Jerry's new group, the League of Mice!