Jack tries to wow bigwig Hank Hooper with his cost-cutting savvy by axing the page program. Meanwhile, Jenna exploits her friendship with Liz to gain fame, causing a miffed Liz to find a new best friend; Tracy reflects upon his mortality.

In an American Idol exclusive, Madonna will world preview the video for her new single, "Give Me All Your Luvin," featuring Nicki Minaj and M.I.A. Plus, more auditions this time from St. Louis, MO as the judges resume their search to find the next singing superstar.

Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.

Sheriff Forbes delivers some disturbing news to Alaric and Elena about the weapon used in a recent murder. In the Salvatore brothers' escalating quest to kill Klaus, Stefan turns to Bonnie and Abby, while Damon reaches out to an old acquaintance for help in setting up an elaborate plan. Intent on a plan of his own, Klaus hosts a strange dinner party, where he reveals another story from his family's violent past until an unexpected guest brings the party to an end. Meanwhile, Caroline is heartbroken when she is unable to stop a tragedy from unfolding.

It's Valentine's Day and Leslie decides she needs to find Ann a new man. Ben must enlist Ron's help when he is stumped by Leslie's elaborate Valentine's Day scavenger hunt, and Chris is depressed about the status of his love life.

Rob becomes obsessed with finding out about Maggie's past, even enlisting Hector to help him snoop around. Meanwhile, Rosa and Fernando stop speaking to each other after their biggest fight gets brought up.

As Meredith puts Zola to bed and falls asleep, she begins to wonder - what if her mother had never had Alzheimer's and she'd had loving, supportive parents? The reverberations of a happy Meredith Grey change the world of Seattle Grace as we know it. What if she had never met Derek in that bar and he had never separated from Addison?

Dwight presses Jim for information from the trial he was a juror on. Meanwhile, Angela gives birth.

Cassie enlists the Circle's help when she receives a frightening warning about the witch hunters' return. At the same time, her true feelings for Adam and Jake surface during a birthday party that Ethan decides to throw with the help of Diana.

Reese and Finch take on the case of a out-of-work construction foreman who is soon framed for the murder of a congressman. Finch soon discovers that he's up against a mysterious hacker who is his technological equal, and turns to former Person of Interest Zoe Morgan for help.

Isabel's new boyfriend Frank, an all-star baseball athlete, gets robbed, and Walter steps in to help find his stolen collectibles. But in the process, Walter learns Frank has lost something more meaningful than memorabilia. Then, to earn Willa's trust, Leo and Walter bring her in on the case.

The designers have to convince ordinary people on the street to give part of their clothes to them. They have to make new outfits from the clothes they get.

Reagan becomes determined to secure a coveted spot for Amy at a prestigious preschool. In an effort to win favor with the admissions office, Reagan volunteers to spearhead the school's annual fundraiser and enlists Ava to help her run a charity auction. Meanwhile, when Chris's older brother comes to visit, the two Brinkley boys revert to their old competitive childhood ways.

Joe, Murr, Q, and Sal are back for more. See what kind of pranks they pull on each other this time.

Sheldon counsels Sam's friend, Rick, an Army veteran suffering from PTSD who harbors a secreted sexual trauma; Erica and Mason are involved in a nonfatal car accident that forces Cooper and Charlotte to further come to grips with their future; Violet and Pete struggle to navigate life after marriage when he finds her kissing Scott; and Addison and Jack attend a medical conference they won't soon forget.

Jane and the CBI narrow down the list of suspects after a disgraced clothing designer on the verge of a comeback becomes a fashion victim. Meanwhile, FBI Agent Darcy continues her investigation into finding Red John.

The Royal Canadian Mounted Police enlist the help of ISIS to transport a captured Canadian terrorist. On a train.

The roommates celebrate Vinny's return; Mike goes out of his way to be nice but gets on the guys' nerves; Snooki deals with an uncomfortable condition.

Mitch is blindsided when a Judge's offer of leniency for his client is revealed to have ulterior motives. A clever Claire tries to convince her parents that she needs a cell phone to fit in, but when her parents disagree, she devises a new plan, that scares Abby to the core.

Gary and Joel want to surround themselves with positive influences so they become managers on the high school baseball team.

Dr. David Agus

John Krasinski, Jenny Slate, Evanescence

Jason, egged on by his friends (and several beers), posts an ad looking for Jane on missed connections. Tina loses her license to mock him, when, while anxiously awaiting a text from Brett, she de-virginizes an intern. Stacey and Eric have new mattress sex on a mattress that turns out to be anything but new.

Christiane Amanpour

Woody Harrelson, Lana Del Rey

Drew Barrymore, Blake Shelton

Daniel Radcliffe, Mark Forward

A murder investigation is launched when a concerned citizen alerts the police to a shocking video that is spreading like wildfire on the web, in which a teenage girl is attacked and shot.

After one of the teams friends called Carol suffers a heart attack, the gang find out that she's been the victim of a sham diet plan run by American Dr Dean Deville and his wife, Dana. Mickey comes up with a weight-loss scam to sell them a a new miraculous diet pill, but knows they'll first need to gain their trust.

Graham is joined on the show by Reese Witherspoon, Reginald D. Hunter, Alex Kingston and The Musgraves.