Keith David

When the annual bicycle messenger race takes place in Seattle, the hospital emergency room fills with an assortment of injuries, causing the interns to compete for the most severe cases. Meanwhile, Derek and Burke compete for the chief resident position, and while Derek continues to pursue Meredith romantically, a patient flirts with George.

After seeing Marvin blissfully enter retirement, Grandma Huang decides it's her turn to retire from something; when Louis fails to celebrate her as she wanted, it will take a visit from Hurricane Gene -- and maybe a hot tub -- to make things right.

Dre realises he needs to intervene when Pops starts gambling and partying to mask his heartbreak; Bow pawns school drop-off onto Junior so that she can avoid an annoying parent.

The students of Greendale are drawn into an epic pillow fight as Troy (Donald Glover) and Abed (Danny Pudi) start a war that threatens to destroy their unique friendship. And even though Jeff (Joel McHale) initially takes advantage of the fighting to avoid going to class, he eventually realizes that he would do anything to keep his friends together.

After Frankie banned Greendale's yearly paintball game, the game has gone underground and is threatening to ruin Frankie's "Cleaner Greendale" gala. At Frankie's request, it is now up to Jeff and the crew to stop the paintball game and expose "Silverballs", an unknown player who shoots silver paintballs.