Community (8pm, NBC) - In the first part of the show's two-part season finale, the students play paintball during a campus picnic. But the competition quickly becomes heated and the emergence of a mysterious man (Josh Holloway, aka Sawyer from 'Lost') signals a change in the game.
American Idol (8pm, Fox) - Someone is eliminated, but not before judge Jennifer Lopez, rapper Pitbull, and country group Lady Antebellum all perform.
Parks and Recreation (9pm, NBC) - Leslie's ex-best friend (Parker Posey) launches an attack on Pawnee, banning residents from visiting a nearby park in the neighboring city of Eagleton.
Thoroughbred (9:30pm, UNC-TV) - A documentary that explores the world of thoroughbred horses during the year leading up to the 2009 Kentucky Derby. Features looks at grooms, jockeys, trainers, owners, and breeders.
30 Rock (10pm, NBC) - In the Season 5 finale, the 'TGS' gang are ready for summer vacation. Liz lands in the Hamptons for rest and relaxation, but then Tracy moves in next door. Also, lonely Jack latches onto Kenneth for company.
Running Wilde (10pm, FX) - Do you miss Will Arnett's canceled Fox sitcom 'Running Wilde?' Me neither. But they're showing the last unaired episodes anyway -- on FX every Thursday night at 10pm. They actually started last week, but if you missed that one, looks like it's repeating at 10:30 right after tonight's episode -- in which Emmy gets Migo involved when she champions immigrant rights, and this tests Migo's loyalty to Steve.