Jeff helps Duncan score a date with Britta while Abed and Hickey have a strange evening of bonding and Chang has a ghostly encounter.

COMMUNITY -- "Geothermal Escapism" Episode 504 -- Pictured: -- (Photo by: Justin Lubin/NBC)

To celebrate Troy's last day on campus, Abed declares a campus-wide game of "The Floor is Lava" with a coveted $50,000 prize.

COMMUNITY  "Cooperative Polygraphy" Episode 503

Following the tragic death of Pierce, the gang is subjected to a group lie detector test to determine if any of them are to blame.

COMMUNITY -- "Basic Intergluteal Numismatics" -- Pictured: (l-r)  -- (Photo by: Charles Christopher/NBC)

While Greendale is terrorized by the resurgence of the notorious Ass Crack Bandit, Jeff and Annie painstakingly investigate the crime spree.

Community -- "Introduction to Teaching" -- Pictured: Danny Pudi as Abed

Jeff learns the teaching ropes from Greendale's finest professors.

COMMUNITY -- "Repilot" Episode 501 -- Pictured: -- (Photo by: Justin Lubin/NBC)

The Greendale Gang returns to their alma mater to help save the school...by suing it.