Community | 8pm on NBC

Season finale: The group learns the history of Greendale’s first Dean, Russell Borchert (guest star Chris Elliott, “Eagleheart”), a reclusive, wealthy genius who disappeared amid a personal scandal in the 1970s. Once Shirley (Yvette Nicole Brown) and Hickey (Jonathan Banks) locate the school’s blueprints, Annie (Alison Brie) and Abed (Danny Pudi) lead the search for Borchert’s old computer lab, which was sealed off years ago. Subway returns to Greendale with plans to take over the campus for a Subway University and they enlist Chang (Ken Jeong) to secretly keep tabs on the study group. Meanwhile, Jeff (Joel McHale) and Britta (Gillian Jacobs) make a grown-up decision about their futures.