It is softball season in Springfield and many of the workers at Springfield Nuclear Power Plant are reluctant to sign up for the Power Plant team due to their previous unsuccessful year. Homer reveals that he has a secret weapon, a homemade bat named "Wonder Bat" and his co-workers eagerly join the team. Thanks in large part to Homer, the team goes through its season undefeated and earns the right to play in the championship game against the Shelbyville Nuclear Power Plant.
Mr. Burns makes a million dollar bet with Aristotle Amadopoulos, owner of the Shelbyville plant, that his team will win. To secure victory in the game, Mr. Burns decides to hire major league stars and assembles a team that includes Honus Wagner, Cap Anson, Mordecai Brown, and a right fielder who has been dead for 130 years. Smithers informs Mr. Burns that the players he picked are all dead and thus Mr. Burns orders Smithers to find some current superstar players. He hires nine Major League Baseball players - Roger Clemens, Wade Boggs, Ken Griffey Jr., Steve Sax, Ozzie Smith, José Canseco, Don Mattingly, Darryl Strawberry and Mike Scioscia - and gives them token jobs at the plant so that they can play on the team, much to the dismay of the plant workers who got the team to the championship game in the first place.
However, before the game can be played, eight of the nine players are involved in unrelated incidents: Roger Clemens acts like a chicken due to a bad hypontist; Wade Boggs is knocked unconscious by Barney; Ken Griffey Jr. overdoses on a nerve tonic, resulting in an extreme case of Gigantism; Steve Sax is arrested for all of New York's unsolved murders; Ozzie Smith disappears in the "Springfield mystery spot"; José Canseco misses the game while rescuing a woman from a fire; Don Mattingly is kicked off the team due to his "sideburns"; and Mike Scioscia is hospitalized due to radiation poisoning contracted from working at the Plant. Darryl Strawberry is the only star who can play and Mr. Burns is forced to use eight of his actual employees, excepting only Homer who remains on the bench because Strawberry plays his position. During the game Strawberry hits nine home runs, but Shelbyville is able to counter the star right fielder's offensive prowess. With the score tied and bases loaded with two outs in the bottom of the ninth inning, Burns elects to field a right-handed hitter against a left-handed pitcher and pinch hits Homer for Strawberry. The very first pitch hits Homer in the head, rendering him unconscious, but forcing in the winning run. Homer, still unconscious, is paraded as a hero.