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Sheldon goes dancing with the girls while Priya tries to break down the roommate agreement using legal theory.

Damon is willing to go to extraordinary lengths to prevent Elena from being a victim of Klaus' plan to break the curse. Damon's actions put him at terrible odds with Stefan and the tension that started brewing between the brothers over their differing opinions of how to help save Elena's life blows up into full-scale conflict. Tyler returns to Mystic Falls after receiving a disturbing phone call. With the full moon marking the arrival of the sacrifice ritual, Stefan and Elena spend a romantic day together - afraid it might be their last.

When the Anthropology class assembles for their final exam, Shirley notices a twinge, which quickly escalates into full-blown labor. As Jeff and Britta argue about how best to help, Chang is anxious to claim this "early" labor as clear evidence that it's a "Chang Baby!"

When an old photo of Jeff appears in an art gallery, he decides it's time to make some changes in his life. Meanwhile, Russell experiences a slump with women until he sees a familiar face.

The team identifies the remains of a successful ad man found in the grounds of a newly built community center playground. Upon inspecting the victim's home and interrogating his former partner and employer, Booth and Brennan discover that the victim burned bridges by adopting an aggressive attitude toward honesty and was a member of a radical honesty support group.

Nick and Greg have a barn full of scattered body parts to piece together - without names or heads to identify them. Langston's old nemesis, Nate Haskell, is back in action and playing his usual game of five-level chess against the LVPD.

Everyone pulls together to help Callie and baby Sofia on their painstaking journeys to recovery in hopes of allowing mother and baby to finally meet; the sudden death of a clinical trial patient has Derek proceeding with more caution while Meredith makes a calculated and risky move.

Michael hopes to have a drama-free day to say his goodbyes. Meanwhile, Deangelo and Andy try to make sure Michael's clients don't leave Dunder Mifflin as well.

Upset that Nikita continues to pursue the black boxes, Percy sends Michael to Pennsylvania to check on one of the boxes and the guardian protecting it. Nikita arrives at the town first and is surprised to learn that the guardian is a normal woman named Dana who has abandoned her guardian job and is trying to lead a normal life with her husband and child.

Legendary Cajun Troy Landry has hired lady gator hunter Liz Cavalier and on her first day, Liz showed her skills, but there are still a lot of gators to catch. Today, Troy's hoping to bag 25 gators, to get back on pace. R.J. and J. Paul have been making their mark as the new hunters on the swamp, and they have captured an impressive gator count so far... but all of that is about to change. A poacher is on the loose, and R.J'.s lines are the target. Over in Bayou Sorrel, Junior decides to send Willie out on his own, as captain of his own boat. With two boats running lines, the Edwards boys will move twice as fast. But pleasing Junior won't be as easy as it sounds. While the gator hunters are busy hunting gator, the swamp is hectic with other swampers at work. Brothers Glenn and Mitchell Guist, born and raised on the bayou, are hunting and fishing everything the swamp has to offer. The Guists have their own brand of humor, and a unique way of getting business done.

Jerry's contribution to Leslie's community art show causes a stir. Ben moves in with April and Andy and attempts to teach them how to be adults. Meanwhile, Leslie is frustrated by Chris and his interoffice dating rules.

Steve's excitement turns to jealousy when a former fraternity brother arrives at the mansion and charms Emmy.

Liz realizes that she needs to take control of her personal life by fixing up her dream apartment, but she encounters an obstacle along the way. Meanwhile, Jack has his own problems to deal with when Avery is held hostage. Elsewhere, Tracy finds out that Kenneth, Dotcom and Grizz have bonded in his absence.

Katie feels that Violet's book has breached her patient confidentiality and threatens to sue. This leads Violet to the realization that she'll have to defend her book even though she doesn't feel she's wronged anyone.

Patrick Jane must deal with two failed robbery attempts: one resulting in the murder of a repair shop owner and the other involving a former suspect personally hired by Jane to break into LaRoche's home.

William Cohan

Wade Graham

TV host Phil McGraw; actor Chris Hemsworth; the Broadway cast of "Catch Me if You Can" performs.

Chelsea Handler, Judd Apatow, OK Go

Tom Selleck, Odette Annable

When Pinkie Pie tries to invite all her friends to a second party in as many days, everyone seems to be avoiding her. Unused to having her parties ignored, Pinkie Pie tries to find out why her friends are acting strange.

Guests joining Graham on the show tonight include Jack Whitehall and Adele.