Henry Rowengartner is a 12-year-old Little Leaguer whose love of baseball far outstrips his prowess on the field. Everything changes, however, after Henry breaks his arm during one of his Little League games. When his arm heals, Henry discovers that he has been magically transformed into an unstoppable pitching machine. Suddenly, the once-klutzy kid is pitching for the Chicago Cubs and everyone wants a piece of the action.