A scheme to replace a corrupt cafeteria employee transforms the study group into a criminal gang run by a power-hungry Abed.

Annie's missing pen leads to friction within the group.

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 Shirley's remarriage to Andre threatens to put her dreams of starting a business with Pierce on hold, Britta steps in.

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