When a marine dies to save the life of a Belgravian prime minister from an assassination attempt, the NCIS team is put on the job of protecting the minister's daughter that is currently studying in the USA while investigating the death of the marine.

Sex games, secrets and shoelaces all come into play as the couples of Tree Hill celebrate Valentine's Day.

Sue gets musical when she starts a tribute band. Meanwhile, Rachel wants to elevate her social status and gets help from an interesting source when Brittany comes to her rescue.

Dr King orders Victoria to use her abilities to slip into the Powell home and kill one member of the family. Meanwhile, JJ and Daphne investigate the death of Natalie's mother.

The two teams of contestants are all tied up this week - literally - in a rope challenge in which teamwork will determine which group of players will get to use the gym this week, and which team will have to be creative and find other places at the ranch to work out. One trainer moves into the house to try and get a contestant to open up, and later, one team wins the chance to block someone's weight on the scale at a wild physical and mental challenge that finds them pushing a train 800 feet while answering food fact questions along the way. Then one player reaches a milestone at the weigh-in before another contestant is eliminated and sent home.

When Kelly learns that her reality show is in jeopardy she goes to extremes to stay relevant, meanwhile Malik struggles to find the root of his issues.

Peter and Alex pose as parents of a kid at hockey tryouts as they try to distract a hockey dad/North Korean spy suspected of treason.

When a customer tries to sell his dead wife's diamond ring, the Golds surprise him by turning the item into a priceless pendant. Plus, Ashley butts in on a heated negotiation sending Les through the roof and resulting in a full-out family feud.

While the Blackstone band members air their concerns over the new leadership, Leona allows the police to investigate a child abuse case in the community.

Mike goes under the sea in Tarpon Springs, FL to dive for sponges, then answers some of his viewer mail, and finally discusses an incident that occurred at an abandoned mine.

Suspicious of an undercover venture involving a deal between corrupt cops and military personnel, Callen and Sam try to expose the illegal operation by posing as California highway patrol officers.

When Sabrina points out to Jimmy just how many germs are lurking around his house, the Chance family becomes obsessed with cleanliness. Finding it impossible to keep Maw Maw clean, they move her to the backyard greenhouse, but after watching some old family movies, they discover a surprising secret that has kept them healthy all these years.

Savannah and Alice throw a toga party at Lancer, hoping the festivities will take their minds off the fact that the Hellcats might lose their funding. Marti, Vanessa and Julian come up with a plan that just may get Travis released from jail and save the Hellcats.

A foot, a hand, and a headless torso have surfaced along the Don River and Dr. Philpott, Ogden's replacement, insists the body parts all belonged to one murder victim. Murdoch has his doubts about Philpott's opinion and contacts Julia. Ogden, although initially reluctant, can't help but be intrigued by the case. Murdoch secretly sends her the evidence and Ogden's examination determines that they are in fact dealing with three different victims - but likely only one killer.

Mike and Ethan learn that Adam has been hanging onto "CJ," a stuffed animal he won for Callie at a carnival when they were first dating - and a sort of "go-to" move that Adam has used in the past to win over the ladies. When the guys get rid of CJ, Callie becomes noticeably upset over the missing toy, so Adam tries to win a replica to replace Callie's before she figures out what happened to it.

Sgt.McCluskey after learning about Toby's ability gets him involved on a case of an illegal weapon contraband, that goes wrong when an undercover agent gets murdered.

Detective Adams is suspended from duty and bonds with a witness who is injured. A high-speed chase haunts Officer Brown, and Officer Cooper attempts to clean up a neighborhood.

The Crying Wrestling Fan gets a web redemption and Daniel sits down with Oprah Winfrey.

Will and Diane take on a defamation case from a young Internet billionaire, who is suing the film studio for depicting him in a negative light. Meanwhile, Alicia confronts Will about the message he left on her voice mail.

Kristina and Adam throw Max a birthday party, hosted by Amazing Andy, a man who lives with Aspergers. Crosby and Jasmine deal with an issue that could change the fate of their relationship. Drew and Seth continue to strengthen their bond. Meanwhile, Julia and Joel work on adding to the family.

Anna, enraged at the increasing audacity of the Fifth Column attacks, enlists Ryan in an attempt to wipe out the Fifth Column in one fell swoop. Meanwhile, Father Travis, following Vatican orders, asks Jack to leave the church, and Lisa meets Diana, her grandmother - who Anna said was dead - for the first time.

In the case of she's really a he, Longford and Mahajan investigate the bludgeoning death of a prominent drag queen. As they delve into the victim's life they must sort through ardent admirers and jealous rival divas.

Lights starts training for his fight with El Diablo-his first fight in five years, while dealing with the heartbreak of being away from his family. While sparring, he receives an injury from a thumb to the eye, causing him to see double. This gets him into trouble hanging out with Johnny who tries to help his brother's well-being by setting him up with a call girl. When stories fly about his night out and that the fact he has been cage fighting for money, Lights seeks advice from reporter Mike Fumosa to make the story go away, but he wants to write about Lights' private life in return.

Challenges focused on weapons used in the Prohibition Era. The Team challenge focused on the use of the most common hand gun used by the police during this time. The elimination challenge focused on the use of the gun used by a lot of criminals in this time period.

January Jones

Dr. Phil McGraw, Ginnifer Goodwin, Jump City: Seattle

TBA

The 2011 Sports Illustrated swimsuit issue cover model, Josh Groban

Liam Neeson, Dave Salmoni, Gretchen Wilson

William Shatner, Gillian Jacobs

Karen tries to piece together the mystery surrounding her daughter's disappearance. Cesca continues to test the professional boundaries with Jonah. Nate ends up feeling the wrath of his father over his friendship with Josh.