Devon's doubts about his relationship reach a peak as his friends and family gather for his big wedding day. As Chastain's leading medical device company, Quovadis, continues to succeed, Julian makes a discovery that leaves her uneasy about her involvement in it all. Meanwhile, Conrad continues to work on his relationship with Marshall and Bell takes a risky offer in order to make a mistake from his past disappear.

The top 11 artists perform songs selected by fans live in front of the coaches for America's vote.

Oliver makes a choice that will affect his entire life, as well as the lives of everyone he cares about.

Brackenreid helps a friend in the case of a missing woman and learns he's closer to the case than he thought.

When Hank Heywood confronts Ava about the spending habits of the Legends, Nate steps in to try and smooth things over by inviting Hank on to the Waverider. The Legends then show Hank what they do by visiting 1920s Paris, trying to capture the newest Fugitive. Meanwhile, Mona is trying to make a good impression with Ava, but her over eagerness gets her and Ava stuck in a cell instead.

When a solar flare strikes the planet and knocks out communications between and within colonies, the Olympus Town team races against the clock to locate exobiologist/geologist Marta Kamen, who becomes stranded on the surface during a rogue research expedition. Meanwhile, the colony is bracing for its first-ever pregnancy on the Red Planet; tragedy strikes Hana (Jihae); and Amelie's plans to return to Earth are thwarted. In present day, a scientist and his team on Earth brave harsh and dangerous conditions in the pursuit of data that will help predict the effects of glacial melt on global sea levels.

When a magician's assistant is killed, Frankie goes undercover to find the culprit. But can she see clearly through the smoke and mirrors?

Zach, the new dispatcher at SDPD, goes to various lengths to impress Fatima. Cullen confronts Tolbeck, who admits a shameful secret.

The holidays are naughty and nice for the first responders, who must deal with a stampede at a toy store, a mistletoe stunt gone awry and neighbors competing in a Christmas-light showdown. Meanwhile, Bobby contemplates his future with Athena, Chimney and Buck attempt to lift Maddie's spirits and Eddie must decide if he wants to give his son what he really wants for Christmas - a visit with his mom.

Entering high school, Elena vows to stay ahead of Lila, academically and romantically. Lila eschews a parade of suitors vying for her affection, choosing instead to focus on her ambitions in the shoe shop. Promising a better future for the neighborhood, Stefano Carracci invites Elena, Lila and their families over for New Year's Eve. Things escalate quickly during a fireworks faceoff with the Solaras, leading Lila to see a new side of her brother Rino.

Dr. Neil Melendez, Dr. Morgan Reznick and Dr. Claire Brown grapple with a patient's wish to perform an operation that would keep him from acting on his pedophilic urges; and Dr. Shaun Murphy learns a lesson in empathy.

When Ben and Michaela put everything on the line to save the other missing passengers, the mission goes horribly awry and not everyone makes it out alive. The devastating result pushes Ben and Grace to a traumatic brink, while pulling Michaela and Jared dangerously close together.

Host Neil deGrasse Tyson interviews actor Simon Helberg and co-creator Bill Prady ("The Big Bang Theory"); comic Chuck Nice, astrophysicist Charles Liu and theoretical physicist Janna Levin discuss the portrayal of scientists in pop culture.

Conservatives disregard a government report on climate change, Central American asylum seekers face tear gas at the U.S.-Mexico border, and will.i.am sits down with Trevor.

Coming Soon...

Stephen and Jon's Cartoon Thanks-travaganza.

Uhtred risks returning to Wessex to fulfill his vow to Brida. As the royal wedding approaches, Aethelwold spreads discord from the shadows.

Harp and the crew assemble more men in Scotland; Michael tries to come to agreement with the Lake Walkers; Sokanon is betrayed.

Serena fights chaos on the ward during a hospital inspection as Meena grapples with a momentous decision. Nicky goes all out to impress Mo and prove she deserves her place on Darwin. Meanwhile, Hanssen's wounds remain raw as he tries to lock Gaskell and his crimes in the past.

It's 1963, and Alison Wilson returns home to husband Alexander - shortly before his sudden death. Blinded by grief and focusing on comforting her two teenage sons, Alison is bewildered when a Gladys Wilson arrives at the door, claiming to be Alec's 'real' wife.

A new CCTV installation catches a black shadow: Natasha and the kids are convinced the pub is haunted.