Jeff and the group must salvage an aging museum exhibit that Dean Pelton wants as the centerpiece of Greendale's proposed aerospace training program.

Troy's friends help him celebrate his 21st birthday.

Although Shirley and Andre don't want Chang involved with her baby, he resolves to be a good dad. Abed and Troy's new friend may be a war criminal.

As Annie competes with an overachieving rival in a Model United Nations competition, Jeff wrestles with his feelings for his ambitious friend.

The students of Greendale are drawn into an epic pillow fight as Troy and Abed start a war that threatens to destroy their unique friendship.

As Jeff competes for spots in an overbooked 'History of Ice Cream' class, Abed copes with the looming end of their time at Greendale by retreating into a surreal mental 'happy place', while Annie and Shirley engage in school-wide pranks.

Jeff organizes a lovely holiday gathering at his apartment, but Annie secretly invites Professor Cornwallis to get in his good graces.

Abed tackles a two-day crash course on Nicolas Cage, while a clueless Jeff begins his teaching career with Annie as his most demanding student.