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Jeff returns to Greendale a year after graduation to research a potential lawsuit after his practice goes under. While doing this, he finds out what has happened to his friends within the study group since his departure.

Jeff begins his teaching job at Greendale and is shown the ropes by Professor Hickey, with whom he shares an office. While Jeff learns to adjust to the expectations of being on staff, Abed convinces the rest of the study group to take Professor Garrity’s new class on whether Nicolas Cage is "good" or "bad".

Jeff and Annie try to solve the case of the Ass Crack Bandit, who drops coins into people’s pants. Though the suspect is quickly caught, Jeff believes that perhaps the real Bandit is still at large. Meanwhile, the team receives bad news about one of their own.

The study group undergo a polygraph test as part of the conditions of Pierce’s will, but it soon turns sour as the group’s secrets come to light, and Troy makes a major decision in order to satisfy the conditions of the bequeathing.

To honor Troy’s last day at Greendale, Abed organizes a campus-wide game of The Floor Is Lava.

Annie and Hickey embark on a mission to start improving Greendale, but it soon turns into a labyrinthine chain of favors. Meanwhile, the rest of the gang help set up a dance, and Abed connects with a fellow student.

Jeff helps Professor Duncan try to win over Britta’s affection. Abed and Hickey face off after Abed accidentally ruins some of Hickey’s drawings, and Chang finds himself in the middle of a ghostly mystery.

The introduction of an app that allows people to rate others causes the campus to devolve into a caste-based society.

Jeff, Shirley, and Hickey discover a large stash of unused textbooks, but soon turn on each other when deciding the best way to sell them. Meanwhile, Annie and Abed decide they need a new roommate, and play an old-west themed VCR game to decide between Annie’s brother Anthony or Abed’s girlfriend Rachel.

The study group organizes a game of Dungeons & Dragons so that Prof. Hickey can reconnect with his estranged son, Hank (David Cross).

The entire group becomes part of the cast of a classic "G.I. Joe" cartoon from the 1980s, which turns out to be part of Jeff’s coping mechanism as he deals with a monumental life event.

When Greendale is appraised to be an asset instead of a liability, the school board immediately decides to sell it to Subway. Abed, Annie, and the Dean find a secret that may save the school, and Jeff must decide where his allegiance lies.

With Greendale hours away from sale, the group searches for the hidden lab of the school’s first dean, believing there is a treasure there which can save the school.