When a Marine is found dead, Gibbs, Fornell and the team hit the open road to bust an illegal trucking operation.

American Idol's newest judge, Ellen DeGeneres, joins Simon Cowell, Kara DioGuardi and Randy Jackson in Hollywood to begin winnowing down the contestants. The golden ticket contenders chosen from around the nation will endure a grueling rehearsal schedule and pressure-packed auditions as they vie for a coveted spot among the Top 24. Find out who will survive and who will go home during round 1.

It's a star-studded Olympic-themed episode of "The Biggest Loser: Couples" to help kick off the winter games! This week, the contestants head to Colorado to train like Olympic athletes at the U.S. Olympic training facility in Colorado Springs.

"Extreme Cave Diving" follows a fearless team of scientists as they venture into blue holes-underwater caves that formed during the last ice age, when sea level was nearly 400 feet below what it is today. These caves, little-known treasures of the Bahamas, are one of Earth's least explored and perhaps most dangerous frontiers. The interdisciplinary team of biologists, climatologists, and anthropologists, led by renowned cave explorer Kenny Broad, discover intriguing evidence of the earliest human inhabitants of the islands, find animals seen nowhere else on Earth, and recover a remarkable record of the planet's climate. The stakes are high as the scientists swim hundreds of feet through narrow, dark passages that have trapped and killed divers in the past, but the scientific payoff is considerable.

Kate finds herself on the run, while Jack is tasked with something that could put a friend's life at risk.

Mike visits a bone black plant in Michigan and then talks about his five dirtiest jobs.

While opening a safety deposit box at a local bank, NCIS Special Agent Kensi Blye is shot after three armed assailants enter and hold everyone in the building hostage.

Psychologist Dr. Kate McGinn and partner Price Whatley, a former detective, team up to help Noah, a teen who has frequent regression episodes - repressed memories from a past life - in which he was previously kidnapped and murdered. With Dr. Malachi Talmadge and Dr. Rishi Karna, McGinn and Whatley set out to find the person who committed those crimes 14 years ago.

When a young man falls to his death from atop a skyscraper, the Forgotten Network takes on the near impossible task of identifying him. Their efforts lead them into the world of "Parkour" or free running, where they learn John Doe may have recently returned to America after an extended stay abroad. The case takes an unusual twist when two separate individuals come forward, each claiming the Doe as their own. But which one is really his relative? What brought John Doe back to America? And was it a dangerous Parkour act that got him killed or something more sinister?.

As Alicia defends a husband accused of murdering the babysitter, she and her family prepare for the outcome of Peter's appeal and his possible homecoming.

To avoid an international conflict, Peter and Neal have to find a thief who is stealing pieces to a valuable collection.

After losing in two consecutive games, the Blue Mountain State team indulges in a drug frenzy to rebuild their morale. Sammy has a fun night out with a girl having no arms.

Newt Gingrich

Tonight Stephen welcomes the chief political correspondent for ABC News and co-host of Good Morning America, George Stephanopoulos.

Jennifer Garner, the "Sports Illustrated" swimsuit issue cover model, Sade

Barnaby goes along on a trip from Midsomer Parva to Brighton as he is suspicious about a deal to buy coastal land for holiday chalets. After a property developer and a hotelier are beheaded, Barnaby works out there could be a connection between the developer's greedy need for land and Lady Matilda's longing to preserve her family line.

By our third year, most of us will have learned to count. Once we know how, it seems as if there would be nothing to stop us counting forever. But, while infinity might seem like an perfectly innocent idea, keep counting and you enter a paradoxical world where nothing is as it seems. Mathematicians have discovered there are infinitely many infinities, each one infinitely bigger than the last. And if the universe goes on forever, the consequences are even more bizarre. In an infinite universe, there are infinitely many copies of the Earth and infinitely many copies of you. Older than time, bigger than the universe and stranger than fiction. This is the story of infinity.