Jeff and Britta engage in a dangerous game of relationship one-upsmanship in response to Britta's embarrassing moment at the end of the previous school year, which could cause the entire study group to fall apart.
Jeff blows off the study group and their break-dancing competition to hang out with his old co-workers at the law firm, but Annie tries to prove that one of them is the person who turned him in and got him fired.
Pierce's religion convinces him that the spirit of his dead mother is captured in a cheap lava lamp, Jeff has a crisis of faith when he learns he has high cholesterol, and Britta and Annie try to raise money for the oil spill.
Shirley asks Abed to make a film about Jesus, but he quickly angers Shirley by turning it into a self-indulgent mess. Meanwhile, Pierce begins blowing off the study group to hang out with the "hipsters."
Britta, Annie and Shirley discover that Abed is skilled at insulting the mean girls, so they use him to their advantage. Meanwhile, Troy and Jeff find a secret garden with a trampoline, which they use for relaxation.
The study group takes Troy out to a bar to celebrate his 21st birthday. While there, Annie assumes a new identity, Abed is propositioned by a man, one of Shirley's secrets is discovered, and Britta and Jeff fight over the "cool" bars.
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.