Buddy is back again after having mastered basketball, football, and soccer, for his fourth film where he heads out to the baseball field. Now that Bud has become a Little League star and is having fun with Josh's (Kevin Zegers) little sister Andrea (Caitlin Wachs), crisis strikes. One of Bud's puppies has been stolen and Bud must put down his bat and glove in order to solve the case.