When Brennan is shot while working late at the Jeffersonian lab, she is rushed to the hospital in critical condition. While at the hospital, she struggles with visions of her mother that defy her usual logic. Meanwhile all evidence suggests that Brennan's attacker may be linked to the Jeffersonian.

Ted is reluctant to break up with his crazy girlfriend Jeanette. Meanwhile, Robin becomes attached to Marvin after finally holding him for the first time.

Daphne continues to hide the truth from her parents, while Bay gets closer to Noah.

It's halfway through the competition, and the remaining eight players go to singles this week. The contestants face their first temptation in honor of Valentine's Day, featuring favorite Valentine's Day treats and the promise of the winner getting a weigh-in-advantage for themselves and a friend. Meanwhile, the trainers continue to motivate the kid participants to stay active and work toward their goals at home. Jillian arranges for Sunny to take a Bollywood dance class, Dolvett motivates Lindsay to attend a cheerleading practice, and Biingo anxiously waits for news from the doctor about whether he'll be able to start practicing for the youth baseball league tryouts that Bob set up for him. Back at the ranch, one player displays an amazing act of kindness, and another has an emotional, heart to heart talk with a trainer about the circumstances leading to his weight gain. Later, a racing challenge leads to two players winning heartwarming reunions with loved ones, and in this week's Challenge America segment, Season 11 winner Olivia Ward and her husband share a healthy way that couples can celebrate Valentine's Day. And finally, the elimination following the weigh-in forces one contestant to make their most difficult choice yet at the ranch.?

Sean and the six remaining bachelorettes visit the Caribbean island of St. Croix. While there, one woman reveals a surprising fact about her past that could ruin her relationship with Sean. Later, Sean's sister arrives to help him sort through his feelings. Two women are eliminated.

Muscle Man, Rigby and Starla are annoyed about Mordecai's awkward goodbye to Margaret so they try to get Mordecai to tell Margaret how he feels about her.

Carrie runs into an old friend at her internship and gets invited to his mother's dinner soiree in Manhattan, but her feelings for Sebastian get in her way, until she see him with another girl. Mouse is excited about getting back together with Seth, but her worries about being bad at sex drive her to ask Walt for help. In order to hang on to a favorite spot at the diner, Maggie takes on Donna LaDonna and her friends. Meanwhile, Tom loses his wedding ring, which makes him realize that Harlan might be right about starting to date again.

Jeff and Audrey ask Russell to provide a list of the names of women he has slept with so they can avoid using that name for their baby. Meanwhile, Adam humiliates himself after he spends a lot of money on a new bicycle and gear.

Harry helps Billy's moms, Zoey and Michelle, to encourage Billy to be cooler at school. Meanwhile Jonathan and Janet fear their daughter Anastasia may be failing French, and administer an I.Q. test to Harry, fearing she got the 'dumb gene' from him. Harry and Rose square off about the future of Rose's potential child.

With a gleaming airstream trailer in tow and a buyer lined up, Mike and Frank hit the road to California. When the deal falls through, they find themselves in hot water until a rare opportunity leads to an awesome trade. Like a Hollywood back lot, Guy's jaw-dropping collection includes an entire village built from scratch. It's the pick of a lifetime where every building is packed with classic cars and vintage movie memorabilia. Mike and Frank get first crack at a lifetime collection that includes the biggest collection of leather aviator helmets they've ever seen.

Naomi and Max co-host a charity football game, which brings back some old feeling between them. Navid encourages Liam's new underground fighting hobby, and Adrianna intentionally sabotages a performance, hoping that Dixon will let her out of her contract. Annie's blog gets the attention of a publisher.

Liam is determined to turn Josh and Nora against Aidan, who has more immediate concerns when Kenny begins to suspect that Aidan is a vampire. Meanwhile, Sally and Max grow closer at the funeral home.

Max and Caroline meet rapper 2 Chainz on a cross-country flight on a private plane to attend a musical awards show.

With the future of Ewing Energies in jeopardy, Christopher does everything possible to keep a key deal alive. J.R. works to undermine Pamela, forcing John Ross to choose between a Ewing and a Barnes. Cliff Barnes returns to meet with an unlikely visitor

Milly is on the warpath when she discovers that the local town preservation society is arranging a meeting to discuss the new amphitheatre. Meanwhile, Sasha and Roman take their relationship public; and Talia shares some big news.

Maggie devises a plot to put an end to Hardy. Meanwhile, tension rises as Paul reveals a secret that Jacob has been keeping from Emma and more information about Hardy and Claire's past relationship is revealed.

Murdoch races to stop a madman threatening Toronto with a deadly gas.

The queens connect with their inner child as they star in a fun-filled kids TV show. With guest judges Coco and supermodel Paulina Porizkova.

Before Ron and Bobby can start their very first security detail protecting Wrestling Superstar Ric Fair at a charity event, the boys are forced into a deadly game of chicken at a BMX bike race track.

On Valentine's Day, Mike and Molly play Cupid and prod Harry into asking Victoria out on a date, and to everyone's surprise she accepts. Meanwhile, Carl has a list of reasons why hanging out at the coin laundry on the holiday will help Samuel and him meet single women.

Castle & Beckett get an up-close-and-personal view of a "Real Housewives"-esque reality TV series, "The Wives of Wall Street," when they investigate the murder of the show's rising young star. Meanwhile, Castle's attempt to give Beckett a Valentine's Day gift goes horribly wrong.

Five-0 investigates the murder of a traditional Hawaiian fighting master. Meanwhile, McGarrett hires a private investigator to follow his mother.

A gold video-game cartridge from 1990; a set of keys to Al Capone's jail cell.

The true identity of Mia's father is revealed. After she finds out the identity of her mother, Mia runs away with her boyfriend Kyle to a friend's empty vacation home. Meanwhile, Will visits Edward's home to find answers to some questions regarding Vivian's murder.

Sung, Hooten and Villanueva join forces to convince Trisha Miller, a 13-year-old girl with an advanced brain stem glioma, to try surgery one last time before giving up. Shaken from losing a patient, Ty turns to Dr. Tina Ridgeway for support. Meanwhile, Dr. Buck Tierney tries to bully resident Michelle Robideux into pronouncing a potential organ donor brain dead. And Sydney enlists Villanueva's help diagnosing a patient under the care of internist Dr. John Lieberman.

Coming soon...

George Stephanopoulos

Don Cheadle, Bill Burr, Ed Sheeran

Garry Wills

Bill O'Reilly, a Top Ten List presented by Sports Illustrated Swimsuit Issue models, the Avett Brothers

James Spader, Lior Suchard, Far East Movement

Julie Andrews, Grace Park

Julie tries to find ways to fill the void left by her absent kids, while the calamitous return of Alex sees Jake's life fuller than ever before...

Dave is worried that Matt will become a mainstay at their house, but Julie, attempting to fill the void left by her absent children attempts to convince him that it is a good idea.

The previous week's child protection case returns to haunt Michael, after Mandy Fairlock is admitted on to the ward, following an arson attack on her home.

There is an unwelcome blast from the past for DI Richard Poole when a former colleague turns up in Saint Marie. Will an extra detective on the Caribbean island prove to be a help to Richard and the team as they try to explain a seemingly random killing, or a hindrance?.

The group interrogates Letts and finally learns The Network's endgame for humanity. Meanwhile, Michael negotiates with Geoff, Arby takes Jessica to his birthplace, and Milner puts Ian in touch with a possibly ally.