Jimmy, known by his friends as Meathead, is struggling to keep a secret. He wets the bed. Together with his dog and his pet ferret, Meathead rides his Big Wheel to misadventures in the gully, a swampy stream that cuts through his neighborhood. Impressing the older kids seems important, but it leads him into trouble. Losing his beloved pets and having his secret exposed, Meathead learns his lessons the hard way.