The team works to identify the bones of a college athlete who was crushed behind gym bleachers. After the body is identified as star player RJ Manning, they discover that he was murdered. Booth and Brennan follow several leads, at one point thinking there could have been multiple killers.

Having been recently dethroned as Queen Bee, Blair returns to school with the support of Serena to find she is still on the outs with her old friends. Dan visits his mother over spring break, and when he returns, Jenny is on the verge of becoming a full-fledged member of the A-List crowd. Jenny must go to dangerous and even illegal lengths to fit in. Serena struggles to adjust to living with Chuck, and receives disturbing packages from an unknown sender.

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he's superior.

In the final 30 minutes before Brent turns 40, Wanda tries to pull off a fireworks display for the occasion that goes terribly wrong. Lacey and Emma disagree over just who should be baking Brent's birthday cake, and Brent is dismayed to discover that his special bottle of scotch has gone missing.

Musical guest Ashlee Simpson takes the stage, a troop from renowned Irish dance show Riverdance performs, and the next couple to be sent home is revealed!

Matt accompanies Amanda, Chelsea, Noelle, and Shayne to their hometowns to meet-the-folks. Matt meets Shayne's dad, Lorenzo Lamas while in L.A.. While in Durango, CO. Matt wonders why Chelsea is not as forthcoming as her father seems to be. Noelle finally opens up to Matt while in Loveland, CO.. And Amanda plays a joke on him while in Niceville, FL. Back in L.A. one of the four will be sent home, while the others will receive a trip to Barbados.

Robin's musical past emerges again as the group learns of someone named Simon from Robin's past. Barney searches for more Robin Sparkles memorabilia.

Not to have a repeat performance, Nathan and Haley interview nannies, with no such luck. Brooke is undeterred when adopting, and she is given a second chance to prove herself to the adopting agency. Mouth is given a chance to have a permanent sports spot in Omaha, which forces Mouth and Millicent to make a decision about their relationship. Meanwhile, Quentin is making trouble with the Ravens coaches.

Alan feels Charlie is unable to control his womanizing ways.

Stalin's terrifying legacy: a subterranean web is so vast modern Moscow is in danger of caving in.

With the annual Greek Ball on the horizon, Casey and Cappie recall a fateful development from their freshman year, and Casey is also reminded of a selfless act by Frannie that had a major impact on her life.

Mike travels to Alaska for an adventure aboard a fish processing ship.

Adam wants Russell to agree to hire Jen to design an ad campaign for one of their clients. He will not listen to Russell and Jeff when they tell him that this is not a good idea. When Audrey shares the fertility issues with Jen, she gives them a gift to help bring them luck.

Samantha finds out about an endangered butterfly habitat and needs to stop her boss and the firm's construction project that would kill them. She decides to use Dena, who is clueless about Sam's plan, to go out with her boss and persuade him to stop the construction project. After Todd and Sam's passionate kiss, Sam is feeling ignored by him.

An unexpected visitor wants to be back in Mia and Isabella's life. Manny wants to meet Jay's parent, but Jay doesn't want her to.

A lawyer is run down by a car and then a man is shot down in a cafe. The only common link between them is that they were both caught on camera in a pedophile sting. The team hunts for the vigilante.

Allison has visions of a friend of Scanlon and Lynn DiNovi dying in a home mishap. This causes her to struggle with connecting some recent "accidental" deaths, consequently putting her own health in jeopardy.

Lauren and Lo are looking into the real estate market as they plan to buy a house. Meanwhile, Audrina reconsiders her situation as a single woman. Heidi makes an attempt to speak to Lauren again.

Tonight, Democratic presidential candidate from Illinois, Senator Barack Obama.



Jon starts the show off by reviewing the Pope's communion day at Yankee stadium and his visit to a local synagogue. Next, Jon looks at the Democratic presidential candidates last minute push to secure some more Pennsylvania voters. Finally, Senior Black Correspondent Larry Wilmore talks about whether Obama actually gave Hillary the finger or was just scratching his face.

Tonight Stephen welcomes Vermont Senator Bernie Sanders.



Also, Stephen talks with Father James Martin, author of My Life With the Saints, about the Pope's recent visit.

Lady Byrne finds her first day in charge of the foundation tough. Mark feels that Linden is taking advantage of him.