It's night 19 and the Solarrion tribe returns to camp after just voting out Sarah at Tribal Council. Spencer is upset with Kass and tells her that she made a bad move. He comments, "She'll go basically wherever her estrogen takes her, not where her brain takes her". Tony, Woo, LJ, Jefra and Trish assure Kass that they appreciate her voting with them and will protect her. Kass tells Spencer that he needs to make big moves in the game, which may not make everyone happy, in order to win. Spencer is tired of hearing what Kass thinks and asks her to stop talking. Kass is happy that Sarah is gone and that Tony and LJ played their idols. She comments, "Everybody is mad that I messed up their game, because I'm playing my game". Kass now feels like a free agent without an alliance.

The Top finalists take the stage in hopes of impressing the judges and winning America's vote! Tune in to see who amazes the judges and who falls flat.

Against Mel's better judgment, Joe agrees to act as a wingman to his recently divorced friend Charlie when they go out to a bar. There, Joe meets Darcy who doesn't know he has a girlfriend.

Meanwhile, Zander decides to move in with two female co-eds at his college, much to Lennox's chagrin.

Ben is determined to give Emma the perfect first birthday party, especially since his own was less than stellar. When he decides to host it at the ice cream parlor where he and Riley worked as teenagers, Ben runs into an ex-girlfriend with a mother of a secret. Danny accidentally discovers something about Riley's family that turns her world upside down. Meanwhile, Tucker is in charge of entertainment for the birthday party, a responsibility he takes very seriously.

After the shocking death of one of their own, Clarke and Finn grow closer as they try to figure out a way to communicate with the Ark. Bellamy must keep the group from turning on one another as life on Earth takes a desperate turn. Meanwhile, Abby risks having herself floated in order to give Raven the chance to stow-away in the escape pod bound for Earth.

Scouring a mind-blowing collection of vintage petroliana in Massachusetts, Frank breaks a sweat and the bank when he uncovers the holy grail of oilcans. Later, in Rhode Island, the guys get a once-in-a-lifetime invitation to a mammoth Newport mansion where they bid big money on a series of rare gems.

When it comes to intelligence, we humans are clearly the most gifted animals around. But what make us so special? Is it our ability to make and use tools? To solve complex problems? Or plan for the future? It might seem that way, but today, researchers are discovering other creatures with impressive brains that have mastered all those skills. Surprisingly, many are bird brains. Crows bend and shape sticks to create custom-made spears for hunting grubs, and they are just one among a growing list of bird species whose impressive problem-solving abilities are shocking scientists and revolutionizing our understanding of animal intelligence. At the head of the class, we meet animals like Muppet, a cockatoo with a talent for picking locks; 007, a wild crow on a mission to solve an eight-step puzzle for the first time ever; and Bran, a tame raven who can solve a puzzle box so quickly that his performance has to be captured with high-speed photography. But are these skills really evidence of high intelligence, or just parlor tricks, the result of training and instinct? To find out, NOVA tests the limits of some of the planet's brainiest animals, searching for the secrets of a problem-solving mind.

A series of targeted kidnappings near Memphis have the BAU searching for a commonality between the missing persons and a motive to lead to the UnSub. Meanwhile, Savannah vents her frustration to Morgan about the amount of traveling he does for his job.

The sadistic William Lewis escapes from prison, arbitrarily killing as he goes. Concerned for Benson's safety, a security detail is assigned to her 24/7, but it doesn't take long for Lewis to get her back where he left off. With time running out, Benson must decide how much she's willing to sacrifice in order to save the life of a child.

Bruce and Fab's intense dislike of each other lead to a bizarre bonding moment. Tom becomes the talk of bar and gains respect by accident. Liv and Maya track down the owner of a picture of a well endowed package.

Voight and the team discover a massacre, eight million in cash stolen and two wounded men in a clearing house. During questioning, one guy, Perko, provides some intel that is key to the case and leads Antonio to realize that two gangs were involved. Burgess steps up to help the unit and prove herself to Voight. Meanwhile, a softer light is cast on Platt when she enlists the help of Ruzek.

The team tracks down a cannibalistic killer and discover that he's not the only cannibal involved.

Joy's baby daddy, Simon, meets his son and grandson for the very first time as they pretend to be a happy family to get Wilbur into a prestigious pre-school. Melanie and Elka try to find the perfect doctor.

The guys confront an online gamer who's been terrorizing them.

The cast from the latest season of the show reunite to discuss any developments since the show was filmed and discuss the high and low points of the season.

Joel McHale is joined by various wrestling stars including Brie and Nikki Bella, Dolph Ziggler, Titus O'Neil, Jerry Lawler, Michael Cole and John Bradshaw Layfield.

Philip uses his agent Charles Duluth to help him gain access to an early precursor to the Internet so that the KGB can bug American government communications. Nina faces the threat of a potential FBI polygraph exam, bringing her closer to KGB colleague Oleg.

Jim goes all the way to Afghanistan to get away from his parents. While he and Steve find themselves under fire, Billy finds himself stranded alone with their mothers.

Boyce and Lolli's old neighbors from Vegas return in need of a big favor. Kim and Stamps deal with their new living situation.

Colin Firth

Andy Garcia, Jenna Elfman, Ingrid Michaelson

Sheryl Sandberg

Tonight guest is actress Jennifer Garner. Musical guests will they rock duo Dave Grohl and Krist Novoselic.

Lindsay Lohan, Jamie Edwards, Real Estate

3 celebrity contestants compete to determine who has the funniest take on the day's pop culture.

Seth was joined by Denis Leary and Thomas Middleditch, plus music from Fitz and the Tantrums.

Sharon Osbourne, Tony Kanaan

A sudden death, a false suspect and a shocking revelation from the witness box all conspire to block Janet's desperate search for the truth.

When the ghost of a competitive eater starts unplugging feeding tubes at a hospital, Kevin must convince the recipient of the ghost's stomach to enter one last hot-dog eating contest.

After the Blackwall Tunnel explosion, Kev decides to take some drastic measures to try and move on.