TONIGHT: Floyd comes back into Liz Lemon's life on 30 Rock, Leslie hosts a picnic on Parks & Recreation, Sarah and Demetri move to a midnight time-slot, and catfights galore on The Real Housewives of New York City.

8:00 PM

Community Pierce commits himself to spiritual enlightenment and the buddhist church, Britta's prank goes awry. (NBC)
Flash Forward Aaron wants to know why Jericho is after Tracy, Mark questions Lloyd, and Zoey attempts to change Demetri's fate. (ABC)
Spring Break Challenge The final four compete in the "Balls In Challenge." (MTV)
Vampire Diaries Alaric confronts Damon, Matt's mother appears out of the blue, and Elena searches for information on her own birth mother. (The CW)
Parks and Recreation (8:30) Leslie hosts a lunch for the past directors of her department in hopes that they'll provide inspiration for her summer events. (NBC)
NCAA Basketball (Begins at 7:00) Regional semifinals in Salt Lake City (Butler vs. Syracuse, Kansas State vs. Xavier); and Syracuse (Washington vs. West Virginia, Cornell vs. Kentucky).

9:00 PM

The Office Everyone goes out for Happy Hour, which provides for some alcohol-soaked shenanigans: Michael goes to extremes to impress a friend of Jim and Pam's, Andy and Erin try to keep their secret, and Dwight reconsiders his "prenatal contract" with Angela. (NBC)
Grey's Anatomy Owen recalls past war experiences with Teddy, Callie and Arizona have a spat, and Richard adjusts to being a surgeon. Sara Gilbert guest stars. (ABC)
Supernatural Dean and Sam visit Bobby's hometown where the dead are returning back to life. When the zombies turn evil, Bobby may have to kill his undead wife. (The CW)
Police Women of Maricopa County Kelly breaks up an illegal immigration operation (TLC)
Making of 'Clash of The Titans' (9:30) This special takes a look at the 2010 remake of the 1981 fantasy film. The new movie will star Sam Worthington, Liam Neeson and Alexa Davalos. (HBO)
30 Rock (9:30) Floyd (played by SNL's Jason Sudeikis) returns and breaks some big news.

10:00 PM

The Marriage Ref Jerry Seinfeld, Kelly Ripa, and Alec Baldwin weigh in on people's marital troubles as the panelists of tonight's episode. (NBC)
LA Ink Kat puts and ends to the escalating girlfight between Adrienne and Liz. (TLC)
Private Practice In an episode titled "Pulling the Plug," a husband wants to put an end to his dying (and pregnant) wife's suffering. (ABC)
Real Housewives of New York City LuAnn and Bethenny have a fight at a fashion show and then the rest of the housewives gather to talk shit about her. Meanwhile, Bethenny hosts a style event and Jill's show makes someone storm off. (Bravo)
America's Best Dance Crew The four final crews must incorporate magic into their dance routines. (MTV)
Ace of Cakes Season Premiere. Duff gets a "manly basement makeover." (Food Network)

Who's on the Late Night Couches Tonight?

Jimmy Kimmel Live: Pierce Brosnan, Craig Robinson, Sarah McLachlan & Emmylou Harris (ABC)
Lopez Tonight: Eva Longoria Parker, Sinbad, Eric Andre (TBS)
Chelsea Lately Blake Shelton (E!)
The Tonight Show with Jay Leno: Miley Cyrus, Tom Papa, Puddle of Mudd (NBC)
Late Night with Jimmy Fallon: Liev Schreiber, Rob Corddry, Robert Randolph and Sacred Steel (NBC)
Last Call with Carson Daly Mike Shinoda, Lupe Fiasco, Ronnie Faisst, the Airborne Toxic Event (NBC)