After being chastised for not having an email address, Marge gets into the Internet and gets involved in an online role-playing game, where she defeats the world's biggest enemy: her son, Bart. Meanwhile, Homer becomes a kids' soccer coach and rigs the games so Lisa can win.
* AmazinglyEmbarrassingParents: Marge ends up making a fool out of Bart the Shadow Knight.
-->'''Bart:''' Mom, you're making me look bad in front of my minions.
-->'''Marge:''' If they think less of you because of me, then they're not really your minions.
* AndThereWasMuchRejoicing: The players of Earthland Realms sing a happy ditty after they kill the Shadow Knight whilst dancing around his organs.
* FootballHooligans: Lisa realizes how crazy soccer has made her when she watches a documentary about soccer riots, one scene showing a British riot that lasted for ''decades'', and another one in South America where the statue of the Virgin Mary came to life and "beat the living snot out of everyone".
* {{Foreshadowing}}: A gag in this episode has the Lovejoys telling their daughter Jessica to win and "save our troubled marriage". The very next episode "The Boys of Bummer" has the Lovejoys having bed troubles.
* HeelRealization: Lisa after she watches the documentary and realizes how insane soccer has made her, and she admits to Homer was right to kick her out of the game.
* {{Nepotism}}: Subverted. Lisa believes this will happen to her when her father becomes the referee, but gets angry when Homer gives her a yellow card for misbehaving, and angrier when Homer gives her a red card for tearing the yellow card in half.
-->'''Lisa:''' You can't give me a yellow card! You're my father!
-->'''Homer:''' When I put on these shorts, I'm not your father anymore. And judging from how tight they are, I'm not anyone else's either.
* PassingTheTorch: After Bart the Shadow Knight is killed, [[spoiler:Marge becomes the new Shadow Knight.]]
* RPGEpisode: The main plot is about Marge discovering the Internet and joining an {{MMORPG}}.
* StealthPun: The word "gamer" in the title is an anagram of Marge's name.