With Chang in control of Greendale, the study group develops an elaborate plan to infiltrate the campus without being detected.
Pierce is summoned to Hawthorne Enterprises to discuss his inheritance with his deceased father's former right-hand man.
Abed becomes convinced of a conspiracy afoot and that Dean Pelton is an imposter.
As the study group comes to terms with the death of a beloved classmate, Jeff easily adjusts, while Britta acts as grief counselor to the rest, employing what she's learned in her psychology class.
When Annie discovers the study group's yam experiment smashed to smithereens on the science lab floor, the group mobilizes to expose the criminal and save their grade.
When Annie convinces Abed to let her spend some time with him in the Dreamatorium, what starts as an innocent simulation of "Inspector Spacetime" becomes a more serious examination of the study group members.
When Britta's old flame Blade returns to town with the traveling carnival, the group goes to elaborate lengths to keep Britta away from him.
What starts as a casual disagreement about blankets and pillows blossoms into all-out war on the Greendale campus between the armies of Pillowtown and Blanketsburg.
Britta's loyalties are tested when a Subway shop opens at Greendale; a vicious rivalry emerges between Troy and Abed.
Jeff experiences dangerous levels of narcissism, while Abed becomes obsessed with celebrity impersonators.
Andre re-proposes to Shirley; Pierce and Shirley pursue a sandwich business together.
A choir director convinces each member of the study group to sing and dance for the holidays.
Jeff and Shirley share their foosball-related wounds while Annie accidentally breaks Abed's beloved DVD.
Abed catalogs Dean Pelton's descent into madness as he films a Greendale commercial.
Annie moves in with Troy and Abed while Dean Pelton blackmails Jeff into being his friend.
Hawthorne Wipes makes Pierce a hero in the gay community while Troy must choose between plumbing and air-conditioner repair.