When the CIA organizes a father-son baseball game, Stan is determined to show his co-workers that his son is masculine and athletic. Unfortunately, Steve is a geek, so Stan decides to lie and ditches him. But after getting a taste of his own treatment at work, Stan turns to Steve and his sci-fi knowledge to help capture a cyber-terrorist. Meanwhile, Roger goes incognito in a desperate attempt to interact with humans.

When Chris is supposed to be hazed for a school tradition, he runs off to South America; Peter quickly becomes frustrated by his new job at the beer factory.

Picks up where the last episode left off. Meredith attempts to work with Addison Shepard. George is pimped out to relay the hospital gossip back to Webber. Meredith and Cristina relate at Emerald City Bar about what dating their respective attendings is like. Cristina ponders her relationship with Burke while trying to make a decision. Meredith is devastated by the latest blow to her love life. Meanwhile, Joe the bartender collapses.

When Maggie is showing signs of being ill, the family goes to “the more boisterous house of worship” in town to find Dr. Hibbert, who tells them that Maggie is developing the chicken pox. After Maggie develops the disease, Marge tries to keep Homer away from her, since he has never had them. After Flanders expresses an interest in getting his kids infected, Homer and Marge open up the house for a “pox party.” Milhouse’s divorced parents are both at the party and after some “Margerita’s” are consumed, find themselves getting back together. Meanwhile, Homer has developed the chicken pox and Marge tries to keep him from scratching. Milhouse likes the idea of his parents getting back together, but then begins to hate it when he has trouble getting either of them to pay any attention to him. After seeing an episode of The O.C. Milhouse and Bart come up with a plan to get his parent’s separated again, they plant one of Marge’s bras in Kirk & Luann’s bed. They don