Terrorism threatens to shake the foundations of the Navy and NCIS, when the team continues to be eluded by the newest member of the NCIS Most Wanted Wall. Meanwhile, Jimmy Palmer's destination wedding is impacted by the case.

Naomi shocks everyone when she announces she won't be able to oversee Max's wedding because she has accepted a job in New York and will be leaving immediately. Teddy comes back to town and Dixon rushes back from touring to give his relationship with Adrianna another try, then fails to show up at their meeting spot. Meanwhile, Silver feels like she has to choose between Navid and Liam and makes a life-changing decision.

After Grayson's house sustains hurricane damage, he moves in with Jules; Laurie and Ellie ask Travis to help determine which of them is sexier; Bobby and Jules compete in a "white shirt challenge''.

Callen and the NCIS: LA team confront their vengeful adversary, the Chameleon, when an undercover case ignites a deadly mind game orchestrated by the criminal mastermind.

As the countdown to graduation continues, the kids of New Directions prepare a high-concept routine for Nationals. When Tina bumps her head, the world of New Directions is turned upside down in her eyes. Then, the New Directions perform at Nationals for celebrity judge Lindsay Lohan.

The Results are in and Maria Menounos & Derek Hough, Donald Driver & Peta Murgatroyd, William Levy & Cheryl Burke and Katherine Jenkins & Mark Ballas wait to hear if they have made it in the finals. Musical Guests: Alanis Morissette, Carrie Underwood, Julianne Hough, Diego Boneta and Mary J Blige.

Tasha joins the cupcake club to renew her celibacy. Derwin struggles with Melanie away.

Jules plans a spring Thanksgiving after realizing the gang didn't celebrate the holiday together; Ellie's parenting skills are called into question when Stan gets a hold of Big Carl; Grayson helps Andy prepare for an annual pizza toss.

Hopefuls perform for the judges in San Francisco.

As king crab season nears the finish line, the crew of The Wizard faces a life or death situation as a deckhand collapses and struggles to hold on. Catching crab suddenly becomes secondary to a fight for survival on the harsh Bering Sea.

Callen and the NCIS: LA team confront their vengeful adversary, the Chameleon, when an undercover case ignites a deadly mind game orchestrated by the criminal mastermind.

Nationals and graduation approach, and while the glee kids prepare their high-concept routine, Tina bumps her head and sees New Directions from a new angle. Lindsay Lohan (playing herself) is a guest judge.

Detective Murdoch's investigation into the murder of a member of the Toronto Wellingtons hockey team takes him to Ottawa.

When Amelia goes into labor, the Seaside doctors - even those she pushed away - come to her side as she faces the hardest decision of her life. Meanwhile, after Pete finds himself in life-changing trouble, he and Violet realize what they mean to one another, and Addison is faced with a choice.

Bill Maher, Gregg Allman, Hannibal Buress

Brian Williams, El-P

Wanda Sykes, Andy Cohen, Santana

Craig visits Arbroath with Scotland First Minister Alex Salmond, Rashida Jones, the Imagineers

Ever dreamed of running your own restaurant? The contestants are divided into two teams: they must take over a restaurant service in opposing restaurants in Sydney's Kings Cross.

Nina arrives at work shocked to discover Patrick is being investigated over an allegation of patient abuse.

Axl and Gaia's escape from the real world takes a turn for the surreal, while Mike discovers his world is not his alone, and Dawn's world comes to an unexpected end of the line.

When botanist Li Nash digs up the body of recently buried English Professor, Murray Hawes, Lewis and Hathaway are find themselves involved in an impossible quest. Murray was a man who was possessed with solving the riddle of Lewis Carroll's "The Hunting of the Snark". They soon find out that Murray had a rivalry with his brother, who is a lecturer in Theology and Moral Philosophy. They also have to deal with interference from Michelle Marber who is an amateur detective, who believes that that the killer is local medical researcher Alex Falconer.

Lord Sgugar chooses the longest champagne bar in Europe at St Pancras International as the venue to launch the latest task. They are set the task of attempting to raise awareness of English sparkling wine, which rivals champagne in quality, but not in market dominance. One of the candidates from the loosing team is fired by Lord Sugar at the end of the show.