Season 5 finale, 8 p.m, FOXMichaela Conlin) receives a visit from her father, ZZ Top's Billy F. Gibbons, who guest-stars as himself.
Season 2 finale, 8:30 p.m., NBCAdam Scott) tries to prevent Leslie (Amy Poehler) from organizing a children's concert and Mark (Paul Schneider) makes some major life decisions. Rob Lowe also guest-stars.
Season 6 finale, 9 p.m., ABCEllen Pompeo) and Cristina's (Sandra Oh) surgical skills to the ultimate test.
Season 2 finale, 9 p.m., FOXAnna Torv) and Walter (John Noble) are still "over there"—and make some life-changing decisions to prevent the two universes from colliding. Oh, and I'm pretty sure that Walter and William Bell (Leonard Nimoy) have some big-ass showdown.
Season 4 finale, 9:30 p.m., NBCTina Fey) attends the weddings of Floyd (Jason Sudeikis), Cerie (Katrina Bowden), and Grizz (Grizz Chapman), all while trying to find the man of her dreams. Meanwhile, Jack (Alec Baldwin) actually has to decide between Nancy (Julianne Moore) and Avery (Elizabeth Banks). Plus, Matt Damon guest-stars!
12:35 a.m., NBCWill Forte and The Big Bang Theory's Jim Parsons.
Also on the airwaves...
FlashForward, 8 p.m., ABC
Community, Season 1 finale, 8 p.m., NBC
CSI, Season 10 finale, 9 p.m., CBS
The Office, Season 6 finale, 9 p.m., NBC
The Mentalist, Season 2 finale, 10 p.m., CBS
The Marriage Ref, Season 1 finale, 10 p.m., NBC
The Real Housewives of New York City, 10 p.m., BRAVO
MLB Baseball: Cubs v. Phillies
NHL Hockey Playoffs: Flyers v. Canadiens
What are you watching tonight?
Follow TV.com writer Stefanie Lee on Twitter: @StefAtTVDotCom