In the final chapter of One Tree Hill, the tenth anniversary of Tric brings old faces and new possibilities for the Tree Hill family.

With Jonas Otsuji out of the game, Christina Cha, Greg Smith, M.D., Leif Manson, Alicia Rosa, Chelsea Meissner, Jay Byars, Michael Jefferson, Kat Edorsson, Sabrina Thompson, Kimberly Spradlin and Troyzan Robertson struggle to stay in it as the girls get the numbers to be able to change up the game. During Tribal, none of the members are scared of going home.

Hollie Cavanagh, Elise Testone, Colton Dixon, Skylar Laine, Jessica Sanchez, Joshua Ledet, Deandre Brackensick and Phillip Phillips sing for their time on American Idol. This week it is 80's Week. Mentors Gwen Stefani and Tony Kanal join Jimmy Iovine.

When Jessica is overnighted divorce papers, her best friend Lennon convinces her to return home to Brooklyn and back into the apartment they used to share. The girls easily fall back into old habits - none of which is good news for Lennon's live-in boyfriend, Joe. Meanwhile Jessica adjusts to her new single life by reconnecting with old friends like Rav; however her new efforts meet the critique of the friends' precocious nine-year-old neighbor, Queenetta.

What are things made of? It's a simple question with an astonishing answer. Fewer than 100 naturally occurring elements form the ingredients of everything in our world - from solid rocks to ethereal gases, from scorching acids to the living cells in our body. David Pogue, lively host of NOVA's popular "Making Stuff" series and personal technology correspondent for The New York Times, spins viewers through the world of weird, extreme chemistry on a quest to unlock the secrets of the elements. Why are some elements, like platinum and gold, relatively inert, while others, like phosphorus and potassium, are violently explosive? Why are some vital to every breath we take, while others are potentially lethal? Punctuated by surprising and often alarming experiments, David Pogue takes NOVA on a roller coaster ride through nature's hidden lab and the compelling stories of discovery that revealed its secrets.

The BAU travels to Oregon when a series of murders appear to be ritualistic.

The Doyles come together on a murder case where Mal is the prime suspect; Tinny learns some startling news about her parentage.

Jess is visiting her father, Louis King, after he's hospitalized with chest pains when a donated heart destined for high-profile philanthropist Freddy Boise disappears. With just five hours to find the missing heart and sort through daddy issues, Jess has to choose between the likely suspects - a jealous doctor, Boise's ambitious but solicitous daughter, a ward nurse who's equally solicitous of Louis King and a brilliant, imperious surgeon who seems to be very turned on by Spears.

When Pete's mom Vanessa returns to town, Walt is determined to win back his ex-wife at any cost. Meanwhile, following Pete's no-show at work, Alex worries he may have succumbed to old habits. Elsewhere, Screwsie entrusts the care of her boss's less-than-friendly cat to Gary, who has alterior motives for his helpful ways.

The gang find themselves at yet another wedding, this time the nuptials of Derrick and Eric. Will there be "DRAMA," to quote Derrick? Of course, as Brad struggles to tell Jane something important; Jane tries to find a way to help Eric hide the fact that the pricey reception must be downscaled; and Max tries to find the courage to perform with his old all-male Madonna cover band. Meanwhile, a dateless Penny is sad that she's at another wedding, alone, until she meets cute guy Chris via Skype.

While on a romantic getaway to Napa with her boyfriend Ben, Alex experiences a romantic dream involving Pete that causes her to question her true feelings. Meanwhile, Alex's new neighbor Dan, fed up with the crew's antics and destructive behavior, threatens legal action. Elsewhere, Walt prepares for opening night of his latest theatre production and Gary professes his feelings for Screwsie.

When the CSI team is called in to investigate a man who is shot at point-blank range in a local casino, they shut down the entire building to find their killer.

The town's Easter-egg hunt may be canceled due to rumors of a vicious beast that Cartman claims to have caught on film.

A wrongly convicted Southern chef hires Shawn and Gus to find the real thief after the Innocence Project frees him from prison.

Coming Soon...

After blowing up one of Phil's dangerously antiquated duck blinds, the Robertson boys hatch a wild plan to build a luxury duck blind in the sky. Meanwhile, Miss Kay and the Robertson women hold a yard sale and sell some of the boys' most prized possessions, which the boys don't exactly appreciate when they find out.

Jase feels being COO of Duck Commander entitles him to a new office. But when Willie refuses, Jase hatches a plan to build one anyhow. Willie takes Miss Kay and the grandkids to the petting zoo where Miss Kay decides she needs Willie to buy her goats, just like she had growing up on a farm. But, Willie's patience is put to the test when he returns to the warehouse to find that Jase has made some changes.

Mark becomes conflicted about his relationship with Callie. He does his best to be understanding, but their love is soon put to the test when they are asked to embark on a dangerous mission to the fabled underwater city of Atlantis.

Jack L. Goldsmith

Seann William Scott, Maria Menounos, Heartless Bastards

Robert D. Ballard

Kiefer Sutherland, Eugene Levy, the Punch Brothers

David Gregory, Cee-Lo Green, Seal

Jeffrey Tambor