Plot
Pistol Patty, the mascot of "Pistol Patty's Cowboy Creamery", the company sponsoring Greendale's end-of-year picnic this year, storms into the hallway accompanied by Stormtrooper-like paintball players and confronts Dean Pelton (Jim Rash). Pistol Patty is unveiled as Dean Spreck (Jordan Black), from rival school City College. He reveals that his plan was to pose as an ice cream company, sponsor a paintball competition, entice Greendale students to wreck their campus with a huge prize, then cheat to claim the prize himself.
Abed (Danny Pudi) and Troy (Donald Glover) overhear the conversation. They convince the "surviving" students to form a rebel alliance to defeat the Pistol Patty troopers and use the cash reward to pay for the damage done to the school. A remote-controlled robot sent by Dean Spreck armed with a paint bomb almost splashes everyone in the room with paint, but Magnitude (Luke Youngblood) sacrifices himself to save the rest.
The troopers capture Pierce (Chevy Chase), but he convinces them not to eliminate him by offering information on Jeff. Abed impersonates Han Solo and flirts with Annie (Alison Brie), who is attracted to his alternate personality. Jeff (Joel McHale) and Troy each want to lead the group, devising separate plans to defeat the troopers. Jeff plans to lead a mass charge on the troopers' stronghold, an ice cream truck armed with a paintball Gatling gun. Troy plans to lure the troopers into the library building before setting off the fire alarm and sprinkling the troopers with paint. Annie convinces the group to proceed with both plans simultaneously, dividing the enemy forces.
Troy, Abed, Annie, and Shirley (Yvette Nicole Brown) draw some troopers to the library and fortify themselves in the study room, where they plan to escape through the air vent. However, the vent is blocked by Garrett, who gets stuck at the opening. They decide to shoot their way out. Troy is eliminated as he tries to storm through the hallway, while Abed and Annie barricade themselves behind some tables. Shirley triggers the fire alarm, sprinkling everyone else in the library with paint as she escapes the building. Abed and Annie kiss as they "die", only for Abed to snap out of his Han Solo impersonation afterwards.
Meanwhile, the ice cream truck's Gatling gun overpowers Jeff's team, and only Britta (Gillian Jacobs) survives. She is picked up by Shirley in a golf cart, and they seemingly manage to shoot all of the remaining troopers, though Britta is eliminated also. As Shirley celebrates, two troopers emerge from the back of the truck and "kill" her, claiming victory. Pierce (who escaped from captivity by feigning a heart attack), disguised as another trooper, shoots them and wins the tournament. He announces that he is donating the prize money to the school, sending everyone into rapturous celebrations.
The study group, minus Pierce, gathers in the library to discuss which class to take together next semester. They agree to "sleep on it." Pierce enters the room to retrieve his day planner. Jeff gets nods of agreement from the rest of the group when he asks Pierce to join them in the next class together. Pierce pauses and tells the group that he'd never been friends with any group of people at Greendale for more than a semester for the same reason he's been married and divorced seven times: he always assumes people are going to abandon him, so he always sabotages the relationships himself before that can happen so he doesn't feel the pain of rejection. He tells them that Greendale has always embraced him despite his many flaws, just as it has for all of them. He then turns down the new class offer by saying that while he still likes Greendale, he is "done with this, whatever it is" and walks away. The group thinks he is acting out again, but they are shocked when he does not return.
In the final scene, Abed, oblivious to the fact that he is talking to the janitor who will be cleaning up the paintball mess, annoys him by narrating what happened in the competition and asking what his summer plans are.
