The boys try to lose their baseball games on purpose so they can play all summer, instead of dealing with baseball. Randy trains to fight the other fathers at the games.
The boys of South Park are involved in a Little League baseball team, despite the fact that they all hate the sport; they play because of the enthusiasm of their parents. When they win their final game they are initially elated, thinking the season is over, but then discover to their horror that they have to continue playing in the state championships. They decide to lose their next game, and thereby get out of the running for the championship so they can enjoy their summer, but the team they oppose has exactly the same idea. While trying desperately to lose, they manage again and again to beat the other team, whose efforts at throwing the game are more effective.
Meanwhile, Stan's father, Randy, has taken up the hobby of being a "trash talking dad," being generally obnoxious at every game so as to get into fights with other, equally obnoxious fathers. While training to be the best fighter he can be, he becomes terrified when he meets the Denver team's "Bat Dad," who wears a purple Batman cowl and cape, is much bigger than him, and has a bad attitude. He decides not to attend his son's game, as Stan and the others play the Denver game, which, if they win, will force them to waste the whole summer in the national circuit.
The team drafts Kyle's incredibly stereotypically Jewish cousin, Kyle Schwartz (distinguished in a previous episode as "Kyle One") to join their team, knowing he is just terrible at every single sport. Even this fails to work as the other team improved and became "really good at sucking" - they can even "bat themselves out" hitting South Park catchers with precise shots right in the fielders' gloves. Just as it seems the South Park team is sure to win, Stan's dad shows up and begins harassing Bat Dad. The two get into an incredible fight, and the announcers and umpires declare that if they continue to fight their teams will be disqualified. With the encouragement of his son and his team (though he doesn't really know why) and other illusionary people in his head (including Mickey Goldmill from Rocky), Randy keeps fighting, and the South Park team is disqualified, leaving Denver to go to the national circuit. Stan tells his father, "You're the greatest," as he is led away in handcuffs by the police in his underwear. After hearing that, Randy jumps for joy as the song "You're the best" plays.