Justice comes in the form of a letter as the team at the Dead Letter Office solve clues to deliver not only a letter, but an unspeakable truth that has been buried for years. Guest stars Valerie Bertinelli.

Anticipating a visit by a General, Cody pushes Pete to maintain insanely high standards among the Rear D. Meanwhile, Jill gains newfound respect for Randy after she is paired with him to prepare for the inspection.

In the Season 5 premiere, the Browns meet with a potential investor for their jewelry line; Christine's daughter Mykelti brings a boyfriend home; and Meri's revelation could ruin her relationship with another sister wife.

Kris and Bruce come to a decision about their future. Khloe has to deal with changes in her relationship with Lamar.

We've traveled such a long way together, from deep inside the heart of an atom clear out to the cosmic horizon, from the beginning of time to the distant future... We're ready to perform an experiment. It's a thought experiment so all you'll need is brain. If you do it correctly, the vastness and mystery of the cosmos is the inescapable result.

Mary struggles when she realizes that Abe is a spy working for the other side. Ben and Caleb hope to save Patriot families when they carry out a raid on Setauket.

The classic dish, mac and cheese, gets a challenging twist in the first game, Aisle Down. Then, the chicken dinner sheds some pounds in Watch Your Weight. In the final game, there's romance in the air, as the chefs must make a romantic meal - until their shopping efforts are thwarted when Guy pulls the ol' switcheroo in Cart Swap.

Jackie learns about a DEA investigation at the hospital that will require her to take a urine test, so she plots to get around it. Meanwhile, Kevin and Mia plan their wedding; the homeless nun returns in worse shape than ever; and Coop and Carrie find a way to skirt their no sex in the hospital rule.

Jane attempts to help a man on death row, after she believes that he is innocent. Kim helps a dance company that helps inner-city kids after some their dance routines are stolen by a famous pop star.

The Night's Watch attempts to defend Castle Black against Mance Rayder's massive wildling army, who plan to siege the fortress from the north, while a secret garrison of wildlings, including Ygritte, are poised to launch a surprise attack from the south.

Kiera finally learns the truth about John Doe. Alec must make a difficult choice between business and family. Liber8 is rocked to the core by new information about their mission.

Parts Unknown tours Bahia, known as the "African heart of Brazil" and internationally recognized for its Afro-Brazilian music, art, design and food. A look at the dance/martial art of Capoeira, the region's legendary food vendors, Salvadoran fishing neighborhoods, and a BBQ on the beach are featured.

A Nun helps Hank put things into perspective when he recalls his turbulent relationship with Karen, how confused things were with Becca and how happy Charlie and Marcy used to be.

Marisol is shocked when Nicholas asks her a question. Opal realizes the only way she will get help is by turning to Ethan. Zoila and Javier go for dinner at Genevieve's. Valentine gets caught up in the debacle between Evelyn and Adrian. Carmen and Spence have to deal with bad behavior from Ty. Lucinda isn't impressed by Rosie's behavior.

Vanessa relates the tale of how she and Mina Murphy became close friends... and how she ultimately betrayed her friend to the fiend that now holds Mina enthralled.

Increase Mather makes it his first order of business to catch a real witch, and starts by pinpointing a prominent figure from Salem's most sinful district. Mary worries that Increase will detect that his old friend George is under a spell and enlists the help of Isaac to deter Increase from uncovering the truth. Meanwhile, accusations within Salem intensify and Cotton must deal with a painful turn of events - and Anne's suspicions of her father reach a fever pitch.

After surviving a visit from IBM, Joe's team must overcome internal differences and begin the technical feat of building the new machine.

With Thornhill ahead in the polls, Selina and her staff discuss how to make her more "folksy". In need of a job, Jonah meets with Bill Ericsson. Selina has an interview with pretentious journalist Quincy Carter.

Three days before the New Hampshire primary, Selina and her staff juggle her multiple official obligations and campaign appearances.

John covers China's obsession with the show Friends and erasing Tiananmen Square; the corruption and abuses of FIFA; quickly covers Tim Matthew's name-dropping; and mocks Syria's "President" Assad's musical tastes.

Master Chief and Cortana are involved in an uncomfortable conversation.

Piper is challenged by her Soso experience; Morello gets her heart broken; a figure from Taystee's past arrives to disturb the status quo.

In a pressure test like no other, internationally acclaimed chef Nobu Matsuhisa sets a challenge for the losing team from the invention test in one of the toughest cooks yet.

Software Engineers v Heath Family: Three software engineers take on a family team in a bid to make the semis.