A dead Marine's day job at a government think tank leads Gibbs and the team into the life of a 12-year-old prodigy who may be the killer's next target.

In this two-hour episode, the top 12 dancers perform for the judges and for America's votes.

Erica joins forces with an ally to investigate a biological threat. Elsewhere Anna visits a special guest. Chad has second thoughts about the V's after some disturbing proof from a report.

Investment guru Suze Orman, makes a guest appearance on the show to advise the contestants and to administer a quiz. She says she is there to help them find the balance between health and wealth. She tells them that obesity is a very expensive disease. She asks them financial questions relating to health and weight.

Julie faces her greatest challenge yet - the birth of her fourth and final child without husband Dave at her side.

What are dreams and why do we have them? Are they a window into a hidden realm within us? Science is only just beginning to understand. NOVA joins the leading dream researchers and witnesses the extraordinary experiments they use to investigate the world of sleep. From human narcoleptics to sleepwalking cats, from recurrent nightmares to those who can't dream, each sequence contains a vital clue to the question these scientists are pursuing: Why do we dream?

Mike looks back at some of the jobs to see how safety can be important.

It's Dr. Tom's turn for a session as he revisits the last time he saw his daughter.

Forensic scientist Abby Sciuto joins the Los Angeles NCIS team when a murder case resembles the pattern for a serial killer she has been tracking.

The winner of the ninth season of Dancing With The Stars is announced. All of the eliminated celebrities return for one last spin across the floor.

Kirstin and Justin meet in Las Vegas while Spencer uncovers Heidi's dangerous plans of having a child.

SOA gathers the tribe for protection, preparing for the showdown with Zobelle and Weston. The club gets revenge on Weston, Agent Stahl and the IRA. Gemma and Tara talk religion, Tara gets her job back using her connections to the club. Tensions mount between Chief Unser and Deputy Chief Hale.

Alicia is asked to represent the firm's senior partner when he's arrested, but she has to deal with tricky office politics in the process. Meanwhile, Alicia suspects Peter to be guilty of corruption when his evidentiary hearing hits the skids.

Jay's guests are basketball great Charles Barkley and the latest eliminated contestant from The Biggest Loser.

At People's Revolution, Whitney gives Kelly the first look at her design samples. Kelly evaluates the rack of clothes and tells Whitney her next step is to make a look book for her pieces.

Zac Efron, Carrie Fisher, Rihanna

Jack McBrayer, Marisa Miller, Weezer

The school has an open day and both Max and Rachel are determined to show the school as a united one. Ruby changes the menu and puts the things she has purchased on her husband's credit card. When Ruby returns home she finds the bailiffs there and her husband is forced to admit to her that his company has gone bankrupt. Ruby ends up having a breakdown in front of the pupils and an LEA representative. Max is determined to make sure his affair with Kim remains a secret. Rachel catches them together and admits she has known they are seeing one another for quite a while. Rachel is worried that Max is using the open day to make her look bad in front of the school's governors. Rachel is shocked when she finds out that Max has a wife.

Little Britain's David Walliams hosts, with team captains Phill Jupitus and Noel Fielding. Guests include Lord of the Rings star Andy Serkis, Gareth Malone from BBC Two's The Choir, Swedish pop star Basshunter and comedian Josie Long.