While the weather is rainy, with Ralph gulping down water from the rain gutter, the family is enjoying some board games. Homer is getting along with Patty and Selma which they all find weird till they notice the only reason it's happening is because there's no Bart, because he punished him by buying him a computer gaming rig.
Bart is playing Conflict of Enemies with Milhouse, Sophie, Nelson and Martin and wins. Next he's in the shower for too long, and was playing with the game in the shower, and when Homer, on Marge's insistence, tries to stop him, he announces the first prize in the tournament is $1000, which they play at Springfield Elementary School, The Evergreen Terrors vs. The Ogdenvillains, which they win and qualify for a $500.000 tournament.
Homer airs The Detonator to train the kids for world tournaments, but due to a miscalculation on his pee break, he dies and says he's out of business, so Homer starts coaching them. While sleeping he visits the club of dads that lived through their glorious athletic children where dads of famous children coaches him to be a good coach.
At the Capital City Civic Center, they go against Calgary Lames, where despite their deaths, they win, going to the World Championship in Seoul, South Korea. Back at home, Lisa wants to go to the Jogyesa Temple in South Korea, and sees the world championship as an opportunity to fulfill her desire, so Marge agrees to take her too.
In Seoul, Homer tells Milhouse that they've the chance to swap one player, and it has to be him cause of rejection muscle. Lisa then takes the family to the monastery, achieving Zen.
During the championships, Evergreen Terrors, strong of a new kid, a Faker-look alike, battle against the Brazilian Blowouts. Homer seems to reach illumination, when instead of staying with the kids as coach, he does the same thing as reaching Zen, destroys the competition, switching off all electricity in the stadium. The match is cancelled and chaos started in the arena.
In the flight back, the kids are throwing chips at Bart for having his dad ruin their competition, while Homer dreams again of the club, but gets refused due to blowing up Bart's opportunity.