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The study group decides to take a Biology class together, but Pierce soon faces problems when only six seats are available in the class. Jeff quickly makes enemies with their professor (Michael K. Williams) and is removed from the class. Dean Pelton, meanwhile, finds a new rival in Vice Dean Laybourne (John Goodman), the dean of the renowned Air Conditioning Repair Annex.

A Model UN competition introduces Annie to a new frenemy, while Britta goes head to head with Campus Security Officer Chang.

Troy and Abed’s housewarming party turns into a surreal, post-modern world with parallel realities; each reality showing the effect on the study group of one character’s absence from it (e.g. without Troy the group descend into chaos; without Jeff the group has fun). Nominated for the Hugo Award for Best Short Form Dramatic Presentation.

While the gang pairs off to build a terrarium, Chang relishes his imaginary role as a noir detective.

In order to determine the odd man out of the group (who, in this case, is apparently a sociopath), Britta conducts a search by having the gang tell scary stories.

Pierce is excited about a party he’s throwing to celebrate his business success, but the affair becomes very different when his elderly father arrives.

The group tries to help Annie move in with Troy and Abed but things go awry when she becomes frustrated by their lifestyle; Dean Pelton blackmails Jeff into spending the afternoon with him.

Dean Pelton is asked by the school board to film a new commercial for Greendale; Abed films all the activities for a documentary.

Jeff and Shirley spend time together playing foosball. After Annie breaks Abed’s special edition DVD of The Dark Knight, she covers it up by staging a robbery.

Greendale’s choir director (Taran Killam) asks the study group to fill in at the holiday pageant after the glee club is unable to attend.

Jeff begins experiencing extreme narcissism. The group helps Abed get rid of debt by impersonating various celebrities at a bar mitzvah.

Andre re-proposes to Shirley. Britta and Annie quickly begin making arrangements for the wedding. Jeff must write a speech, and Troy and Abed attempt to become "normal" for the wedding. Pierce and Shirley try to get a sandwich shop installed in the cafeteria.

A new Subway shop opens in the cafeteria and Shirley, Pierce, and Britta attempt to shut it down. Vice Dean Laybourne returns to try to win Troy over. Troy and Abed build competing blanket/pillow forts.

Presented in the style of Ken Burns’ documentary, The Civil War: What starts as a casual disagreement over pillows and blankets soon blossoms into all-out war on the Greendale campus. While insults are hurled and the study group choose loyalties, Jeff tries to negotiate a truce, but with neither Abed nor Troy budging on their principles or real estate, the future looks grim for the duo’s friendship.

The carnival comes into town and Britta enlists the help of the study group to keep her away from her ex. Vice Dean Laybourne and Dean Pelton band together to try to woo Troy to the Air Conditioning Repair Annex.

When a final exam is postponed, Annie talks Abed into letting her spend some time in the dreamatorium, where an innocent simulation turns into an examination of the study group.

In a homage to Law & Order, the study group investigate a crime when someone sabotages their biology experiment. When they discover the perp, Annie plans on prosecuting them to the fullest extent of Greendale’s Code of Conduct.

Starburns suddenly dies and Britta insists on counseling the group using her skills from psychology class, despite nobody grieving him. This predictably fails and when the group finds out their biology credit is invalid, their attendance of their fallen classmate’s wake quickly goes awry. Meanwhile Chang takes over campus and has the study group expelled.

When Abed becomes convinced that Dean Pelton has been replaced by an impostor, he is required to see a therapist (John Hodgman), who attempts to convince the group that they have been experiencing a shared psychosis and Greendale is actually a mental institution. This leads to the group to recall the stranger activities and events that took place at Greendale through a series of flashbacks.

Pierce is summoned to Hawthorne Enterprises to discuss his inheritance with his deceased father’s former right-hand man, Gilbert Lawson (Giancarlo Esposito). The study group goes with him for moral support and must all pitch in to play the video game of their life on Pierce’s behalf – or risk losing his inheritance. Most of the episode is animated as an 8-bit video game.

When Chang gains control of Greendale’s campus, the study group forms a plot to take back the school. Troy seeks help at the Air Conditioning Repair Annex.

Jeff and Alan (Rob Corddry) battle in court as opposing counsel in Pierce and Shirley’s sandwich shop case. Vice Dean Laybourne continues to win over Troy to the Air Conditioning Repair School.