Eleven-year-old cousins Liam McCarthy, a catcher, and Carter Jones, a pitcher, grew up playing baseball together and have become closer than brothers. Now, their team is on the verge of winning the greatest championship of all: the Little League Baseball World Series. To reach the title match, however, they must first beat their number-one rivals from Southern California. Little do they know that the game will prove to be just the first challenge they'll face on their road to the championships.