C.J. and Janine have a fight which carries over into the office. Malik takes a class on evolution and doesn't know if he believes in God.

MasTec CEO Jose Mas works undercover at his infrastructure-construction company.

Percy calls the President the United States and threatens to set off a nuclear explosion unless his demands are met. Birkhoff finds two scientists who could help stop Percy's new nuclear satellite, so Nikita and Michael head after one and Sean and Alex look for the other. Unfortunately, Alex and Sean get caught at the very location that Percy blows up as an example of his power. Meanwhile, Nikita realizes the best way to stop Percy is to go into the belly of the beast - Division itself.

Nanny Agatha's twin sister visits, and Jessie suspects she is trying to steal her job and catch Tony's eye. Meanwhile, Emma copes with a giant pimple on her nose.

When Walter's older brother Langston comes to town, he asks Walter to visit their dying father. As his dying wish, his father asks Walter to find his first love, Walter and Langston's mother. Taking on the most important search of his life, Walter battles obstacles which may prove to be insurmountable as his father's health rapidly declines. Meanwhile, Willa is being forced to marry Timo by their Uncle Shadrack.

Emotions run high on both sides of the Tank when Billy Blanks, Jr., the once-homeless son of Tae Bo legend Billy Blanks, asks the Sharks to invest in his and his wife's dance fitness program designed for all ages, shapes and sizes. A music producer from El Segundo, CA wants to convince the Sharks to add a rock band to their portfolios. Also: Two college students from Eugene, OR who started their flavored peanut butter business from their dorm room; and two guys from New York with what they believe is the next big trend in swimwear - interchangeable bikini wear. Plus, there's a follow-up on Steve Gadlin from Evanston, IL and his I Want To Draw A Cat For You drawing business, which Mark invested in during Season 3.

Malik tutors an athlete who can barely read. Curtis is overly canind with the newspapers and causes a PR scandal for C.J. and Janine.

When Mac is shot, he finds himself in limbo between life and death and, as he fights for his life, it's up to his team to bring the shooter to justice.

In order to defeat Dick Roman and the Leviathans, Sam and Dean must locate three key items. Castiel helps with one but for the last objects, the Winchesters must face two of their strongest opponents - an Alpha and Crowley. Meanwhile, Bobby tries out a new ghost trick that ends up being very dangerous.

The Fringe team is pushed to the breaking point as they desperately attempt to prevent a catastrophic event that threatens the lives of everyone.

James Vick fights Joe Proctor and Justin Lawrence takes on Mike Chiesa in the first two quarterfinal bouts.

Topics include Room 102, based on George Orwell's Room 101 from "1984"; an idea for stopping overweight people from eating late-night snacks; and what Karl would take to a desert island.

Judge Nicastro enlists Kate and Ben to mediate a contract dispute. Lauren looks for a painting to hang in the lobby of the firm.

Jessica King must contain a scandal and delve into the messy personal life of a Family Court Judge after he's found strangled with a negligee.

After Juliette stumbles upon a brutal murder, Nick learns the suspected creature, and friend of Monroe, is suffering from a mysterious condition - the inability to completely return to human form. This mysterious condition leads them to a therapist who's created an artificial drug to suppress the creature side, with horrifying side effects. Meanwhile, the investigation takes a surprising turn when Hank sees something he can't quite explain.

Kane and his team battle a racist political group, and Juliet decides to take the law into her own hands when a sex attacker strikes.

Fiona and Imogen scheme to end Marisol's Student Council reign. The plan? Throw an unforgettable end-of-semester holiday carnival. But with a huge family crisis looming, Fiona worries she may have over-promised.

Guests: Former White House advisor Richard Clarke, actress Eva Longoria, CNN political contributor Margaret Hoover, Reuters columnist David Cay Johnston, Founder Americans for Tax Reform Grover Norquist

Topics: Obama's War on Terror, Obama versus Romney on gay rights, Romney and the hard right, Obama's economic recovery, the latino vote and immigration policy, is Romney insensitive to weak and vulnerable people?, obesity

Frank must race to stop a biological weapon attack on New York City, while keeping it a secret from his family during their most sentimental holiday, Mother's Day. Meanwhile, a long-standing conflict between Danny and Jamie comes to a head.

Ben and Ike bet heavily on a boxing match and Vera receives another cancellation from Jackie Kennedy. Meanwhile, Danny receives photos intended for Stevie and the DA makes an important discovery.

In the pilot of new USA series Common Law, Travis Marks (Michael Ealy) and Wes Mitchell (Warren Kole) two of L.A.P.D's finest within the Robbery-Homicide Division have a sever year track record of being the best. However their constant disagreements and bickering is having an impact on their work, leading their Captain (Jack McGee) to take a new approach by sending them to couples counseling with tough-as-nails therapist Dr. Emma Ryan (Sonya Walger) to work through their issues and strengthen their partnership and bond.

Jon Cryer, Tommy Johnagin, M. Ward

Jenna Fischer, Jay Mohr

Larry King, Anna Chlumsky

Lucy is the target of an unknown plot by the Earthland counterparts of Hughes, Sugarboy, and Coco. More about the mystery of the Iron Rod is revealed.

To get his fifth badge, Ash takes on Clay and his ground types.

After learning the Sword of Plun-Darr has been found, Mumm-Ra goes after the Thundercats in order to gain it's evil powers.

The Red Lanterns seek a way to penetrate the asteroid maelstrom between the Forgotten Zone and Guardian Space, and must locate a Thanagarian prisoner who holds the secret. To stop them, Hal and Kilowog must get to the prisoner first.

The Team and the Justice League continue to hunt the Kroloteans that have invaded Earth-but the aliens have help from an extremely unexpected source.

The Fire Ferrets are preparing for the big championship ProBending match, when Amon declares a threat to the city that, if the match was to continue, dire consequences would ensue. Korra, Mako and Bolin convince the council to allow the match to happen, with the help of an unsuspecting individual. What will Amon do to the city when the match happens?.

The acts being mentored by Tom and Will.i.am perform live for the second time hoping to impress both the judges and viewers at home. After all of the acts have performed the phone lines are opened for this week's public vote.

The finalists take to the stage one last time hoping to impress the judges and viewers at home. Ant and Dec reveal that The Mend is this year's wild card act. After all of the finalists have performed the phone lines are opened for tonight's public vote. Diversity and Susan Boyle perform live on stage. After the phone lines close Ant and Dec reveal that Jonathan and Charlotte, Ashleigh & Pudsey and Only Boys Aloud are in the top three. They then reveal that Only Boys Aloud have finished in third place. They then announce that Ashleigh & Pudsey have been crowned this year's winners.

A fed up Dylan is finding it really hard to work alongside Sam, but when they are forced to liaise over a disabled patient and his over-protective daughter, they end up reaching an uneasy truce to get to the bottom of the case, causing Sam makes an impulsive decision after the tension becomes too much for her.
Lloyd becomes very possessive of Scarlett, irritating her and affecting his work. Lenny receives a tempting job offer from London and has to decide where his future lies.