Gene and Courtney get their big break when they are asked to be the new hosts of the morning announcements, but their romantic history threatens to get in the way. Meanwhile, Tina’s attempt to play Cupid goes tragically awry when she volunteers to spear-head the Valentine’s Day carnation fundraiser.

Axe orders his traders to unload their positions, and he unceremoniously disappears from Axe Capital, plunging the firm into chaos. As Axe questions his life choices and plans a trip on his new yacht, Wags and Wendy struggle to maintain order and morale. In response to Axe’s disappearance, Chuck intensifies his investigation, which leads him to a farm in Iowa, where he discovers a key witness to a questionable trade. Armed with the damning evidence, Chuck sends the FBI into Axe Capital to make a surprising arrest.

Turner and Shelagh are at the forefront of the advances in medical technology, and begin a campaign to ensure better respiratory health for their patients. However, Timothy fears their own lifestyle is not good for them and tries to encourage his parents to give up smoking. Violet injures her back and is forced to leave the shop in Fred's hands, a decision that strengthens their relationship but which proves to have other, unforeseen consequences. A new mother's past comes to light, with devastating repercussions for her family. Nurse Crane draws on her own experiences to help her.

Castle finally gets his day in court when he takes the stand as the key witness to a murder from five months ago. But when new information suddenly arises, he and Beckett must race against the clock to prevent a miscarriage of justice.

Cooper faces the ultimate, life-halting devastation when he loses his phone, and the guys stop at nothing to help him get it back. Meanwhile, Leslie and Kelly’s karaoke duet turns into an all-out bar brawl.

Peter overloads his phone with apps. He buys a new phone with more memory, gives his old phone to Chris, and hilarity ensues. Stewie joins a tennis club and invites Brian to be his tennis partner.

While Elizabeth oversees a mission to track down the culprits behind a uranium heist in Eastern Europe, she also contends with highly sensitive issues in Saudi Arabia, including the apprehension of two American teenage girls who intended to join a terrorist group, that threatens to dismantle an important arms deal.

First part of a 2-hour season finale. Charlie's condition proves more dangerous than initially thought, as Alex and Shahir struggle to save his life.

Second half of a 2-hour season finale. Charlie's condition proves more dangerous than initially thought, as Alex and Shahir struggle to save his life.

Ian and Caleb get serious. Lip appears before a disciplinary committee.

The Bachelor At 20: A Celebration of Love will be jam packed with Bachelor Nation fun as viewers will be getting a little check-in with their favorite Bachelors and Bachelorettes of all time, as well as how these love stories have continued long after their final rose ceremonies. Then as an extra special treat, fans get invited to the wedding of Bachelor in Paradise lovers Jade Roper and Tanner Tolbert officiated by Bachelor host with the most Chris Harrison.

Alicia has trouble adjusting when she returns to work at Lockhart, Agos & Lee with Lucca. Their first case, involving a secret new computer tablet, causes a rift within the firm.

Lonely Professor Frink uses science to turn himself into a man whom women find attractive. Then, overwhelmed by the attention, he invents an algorithm to perfectly pair the lonely men and women of Springfield, realizing that scientific exploration is his true love. Meanwhile, Marge, Bart, and Lisa visit Grampa for Valentine’s Day and try to rescue the old folks from a drug-induced hallucination that allows them to relive their happiest memories.

Watch a compilation of some of Jimmy Fallon's best show moments in a two-hour special.

While trying to escape Alexandria, Rick and his group meet trouble when sudden noise draws walkers towards them with what could be fatal consequences.