As Valentine's Day finds Jeff struggling with his feelings for Britta and Professor Slater, Pierce and Troy are wrongly blamed for a prank.

While a tasteless prank ends with Pierce being tossed out of the group, Britta and Jeff are forced to team up against some teen newcomers at school.

When the semester starts, Jeff is stunned that his rejection of Britta has made her a campus star; Chang wants to be accepted into the study group.

When Jeff tries to obtain credit for a fictitious class, the unintended consequences rock Greendale. Abed and Troy build an elaborate blanket fort.

Working on their final anthropology diorama, Chang finds a cache of items stolen by Troy's monkey that dredge up unhappy memories for the study group.

When Jeff introduces an element of randomness into Troy and Abed's housewarming party, reality splits into six timelines.

When Britta falls for the human embodiment of the Subway sandwich chain, Shirley and Pierce hope to use the situation to their advantage.

With his law practice doomed, Jeff returns to Greendale to start a class action suit against the school, but a hologram of Pierce has him reconsider.

New administrative consultant Frankie's strict — and sobering — changes split the group when Abed goes rogue to side with the enemy.

The former study group's future — and friendships — are put to a test when one chapter of their lives closes and a new one begins.