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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.

On the way to a Halloween party, the study group must free Pierce (Chevy Chase) from his panic room and slowly comes to suspect that his mansion is being haunted by the ghost of his late father. Guest starring Giancarlo Esposito.

Troy (Donald Glover) worries about losing Abed (Danny Pudi) to a fellow obsessive Inspector Spacetime fan at a convention for the show, while Annie (Alison Brie) fantasizes about being married to Jeff (Joel McHale) after he backs out of their weekend plans. Guest starring Matt Lucas, Tricia Helfer, and Jerry O'Connell.

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

As Britta (Gillian Jacobs) follows Jeff (Joel McHale) home to see his estranged father (guest star James Brolin) on Thanksgiving, Shirley (Yvette Nicole Brown) invites the rest of the study group to spend the holiday with her judgmental in-laws.

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 (Jim Rash) enlists the study group to make the campus more attractive in order to woo a wealthy student to Greendale. Meanwhile, a class on how to teach P.E. pits Shirley (Yvette Nicole Brown) against Troy (Donald Glover).

As Jeff (Joel McHale) sets out to embarrass Britta (Gillian Jacobs) when announces a dance to celebrate women's independence, Abed (Danny Pudi) looks to realize a lifelong dream by shuttling between two dates in one night. Guest starring Sophie B. Hawkins.

Dean Pelton (Jim Rash) prompts the study group to use puppets to relive the traumatic events of a recent adventure.

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 (Danny Pudi) 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 (Joel McHale) early graduation is unexpectedly disrupted by the study group's evil doppelgangers from the Darkest Timeline.