Walter is a lazy mouse. He is so lazy that he never gets up for school. He doesn't get up until everyone else has left. Finally his family forgets about him and move out, leaving him behind. Walter sets off to find them. He winds up on his own island and makes friends with some frogs. He tries to teach them math and reading, but since he never got up in time for school, he gets most of it wrong. He decides to go back to school and finds his family again. Walter finally learns to be independent and responsible.