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

Claiming that he is about to die, Pierce summons the study group to the hospital to bequeath his belongings to them.

As Dean Pelton films a new commercial for Greendale, the production takes a wild turn once he discovers that a famous alum has agreed to appear in it.

When the yam the study group was growing for biology class is killed, Troy and Abed are on the case.

On the way to a Halloween party, the study group must free Pierce from his panic room and slowly comes to suspect that his mansion is haunted.

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