While the Dean creates a Hunger Games-style competition for admission into a History of Ice Cream class, the final class Jeff needs to graduate and a fear of graduation causes Abed to retreat to his happy place.

The study group's Halloween plans are put on hold when Pierce locks himself in the panic room of his "haunted" mansion.

At the Inspector SpaceTime Convention, Abed finds a new "soulmate," Jeff discovers he looks like one of the show's villains, Shirley and Pierce join a focus group, and Annie pretends to be Jeff's wife.

The Study Group loses access to the study room to the German foosballers, and Chang returns to campus, claiming to be suffering from "Changnesia."

While Jeff and Britta spend Thanksgiving with Jeff's newly-discovered father and brother, the rest of the Study Group tries to escape from Shirley's dysfunctional family Thanksgiving celebration.

Abed makes a new documentary chronicling Greendale's effort to get a research grant for "Changnesia," as well as Jeff's efforts to prove that Chang is faking his disease.

Dean Pelton and Annie try to land a "whale" student while Jeff is assigned to keep Pierce occupied. Meanwhile, Troy and Shirley take a physical education education course, and Abed creates a fraternity to annoy the dean.

While the dean sets up a Sadie Hawkins dance, Britta puts together a competing Sophie B. Hawkins dance. Meanwhile, Abed is set up with two dates to both dances by Annie and Shirley.

Jeff organizes a lovely holiday gathering at his apartment but Annie secretly invites Professor Cornwallis, to get in his good graces.

When Annie and Shirley learn that Leonard is actually holding the spot as the class valedictorian, they join forces to bring him down.

Abed's research into the study group's history uncovers an overlooked series of chance encounters that led each of them to Greendale.

A plan to celebrate Jeff's early graduation is unexpectedly disrupted by the study group's evil doppelgangers from the Darkest Timeline.