Annie lobbies for her new crush, who is also Jeff's rival, to join the study group, but a jealous Jeff counters with Chang. Meanwhile, Shirley announces that she's pregnant, but she doesn't know that it could be Chang's.
Pierce bribes Annie into getting him a bigger role in her anti-drug play, Jeff gets in trouble when he sends a lewd text message from Britta's phone, and Shirley rejects Chang's attempts to be friendly to her.
Jeff hangs out with Professor Duncan after a fight with the study group, but Chang tags along and starts a party. Meanwhile, Abed and Troy fight for a librarian's affection, and Britta goes to a dance with a girl she thinks is a lesbian.
Anticipating a visit from the vice president, dean Pelton holds an election for student body president. An idealistic Annie decides to run, but Jeff decides to run against her to spite her and show how stupid politics can be.
When a beautiful woman rejects him in favor of Pierce, Jeff is convinced she must have ulterior motives. Meanwhile, Troy invents a painful childhood memory in order to attract Britta, and Abed feuds with his professor over "Who's the Boss?"
As the study group gathers to assemble their 20th and final Anthropology diorama of the year, they begin reminiscing about their favorite times together - including a trip they made to a western ghost town, a last minute glee club performance and the array of costumes that Dean Pelton has managed to wear over the year. Meanwhile, Troy's pet monkey returns, only to disappear back into the school's ventilation system.
When the Anthropology class assembles for their final exam, Shirley notices a twinge, which quickly escalates into full-blown labor. As Jeff and Britta argue about how best to help, Chang is anxious to claim this "early" labor as clear evidence that it's a "Chang Baby!" Meanwhile, Greendale is hosting a World Food Festival in the parking lot and a riot ensues - Dean Pelton is caught in the crossfire.
Jeff's plan to keep Pierce out of the Study Group backfires when he gets kicked out instead, Abed copes with bad news about Cougar Town, and Dean Pelton's authority is challenged by another Greendale dean.
When another over-achieving student steals Annie's idea for a Model U.N. club, the Study Group comes to her rescue. Meanwhile, new security cop Chang tries to stop Britta's last-ditch efforts to create a campus disturbance.
Dean Pelton is given the task to make an updated Greendale television commercial, but the shoot soon goes over budget and spirals out of control, descending the dean into madness--with Abed documenting the entire experience.
Shirley teaches Jeff foosball so that he can beat a team of cocky, obnoxious Germans, while Annie creates an overly elaborate ruse so that she doesn't have to tell Abed that she broke his special edition The Dark Knight DVD.