Rip tells the team they are headed to the future to take out a powerful ally that Savage needs in order to conquer the world. However, when Rip reveals the ally is a 14 year-old boy who will one day grow into an evil dictator, the team is split about the morality of killing a child, even if it does save the world. Meanwhile, Sara talks Snart through a rough patch and Ray learns something that could impact his future with Kendra.

Meredith goes on an ambulance ride with Owen and Nathan to pick up a heart for a transplant patient. Musician & MS patient Kyle Diaz is admitted to Grey Sloan Memorial with a tremor in his hand, and the residents apply for the Preminger Grant. Meanwhile, Catherine continues to insert herself into Jackson and April's business against Richard's wishes.

After 15 seasons of epic performances, star power and incredible moments, the final American Idol will be crowned and the farewell celebration will continue, as Idol pays tribute to the amazingly talented contestants and the millions of fans who called, tweeted, texted, and championed their Idols throughout the series' groundbreaking run. Don't miss the history-making final moments of the farewell season as the last winner is announced.

Sheldon, Amy, Leonard and Penny head to Big Bear and share a cabin. Meanwhile Raj interjects himself into Bernadette and Howard's baby discussion.

After Oscar and Felix become obsessed with eavesdropping on their bickering neighbors, they try to subtly intervene and help them save their marriage. Also, Emily and Dani's friendship is tested when they train together to race to the top of the Empire State Building.

When the restaurant closes for renovations, Christy takes a job as Jill's personal assistant. Also, Bonnie answers a wrong number and falls for the guy on the other end of the line, Adam.

After Red learns that a tactical nuclear weapon is being targeted by thieves, it's a race against the clock as the task force struggles to stop them - and prevent an imminent nuclear disaster. Meanwhile, Tom and Liz make a decision that will change their relationship forever.

Jaha employs a terrifying new method to convince Abby to join his cause, Kane is on a mission, and Bellamy is hit with a hard truth. Meanwhile, Monty finds himself in a precarious situation, and Jasper rushes to save one of his own.

The designers must combine sports and fashion to create high-end leisure wear inspired by the "Touch By Alyssa Milano" line.

The election is in full swing, which means everyone is doing their best to take down their opponents, but when a potential leak threatens several candidates, they have to work together to keep their secrets safe. Boundaries are pushed and lines are crossed as we find out just how far some people are willing to go to protect themselves.

When the girls go to prison to see Caroline's father, Martin, perform in a musical, they tell him their plan to use Caroline's movie money to convert their cupcake window into a dessert bar.

The guys pose as inhospitable restaurant hosts, then beg strangers to babysit their grandfathers. Plus tonight's punishment is the longest in Jokers' history.

Musician Jason Derulo battles actress Katharine McPhee.

Anderson Vaughan Investigations takes on a case that hits close to home when Valerie's estranged husband, Gordon, comes to them for help after his sister suffers horrible side effects in a Multiple Sclerosis clinical trial by a big pharmaceutical company. Meanwhile, Alice is following her biggest lead yet in tracking down Ben, as he's in the midst of luring their next victim, Princess Zara Al-Salim, into a multimillion dollar fraudulent real estate investment.

After Gerald is arrested for wearing an expensive watch that was stolen in a robbery/homicide, Carter sneaks his cousin out of jail in order to use his street contacts to track down the killers.

Archer and Lana have to take part in a tricky handoff whilst the rest of the gang listen to the best voicemail ever.

Jealousy sparks for Kailah when Dione meets another girl, and a scandalous internet post shocks the entire house leaving one roommate to wonder who she can trust in the house.

Defeat for the Vikings calls Ragnar's leadership into question as they evacuate their camp and move back down river. Ragnar remains inscrutable until he orders the fleet to beach at a cliff face and unveils an ingenious plan. Rollo and Gisla have news that strengthens Rollo's position at the French Court whilst Count Odo fails to identify his true enemies, with fatal consequences.

Craig is joined by guests actor Jack Black, comedian Tymberlee Hill, and professor Stephen Prothero as they debate and discuss history's most influential drug.

Michelle Wolf unpacks the role of candidates' wives on the campaign trail, the winner of Third Month Mania is revealed, and Juan Williams discusses his book "We the People".

Conan is joined on the show by Liam Cunningham, Paul Reubens and Michael Kiwanuka.

Larry reverts to his 70s-era Soul Daddy persona while examining modern-day issues facing America with Jake Tapper, Ricky Velez and Holly Walker.

Coming Soon...

Stephen welcomes Mindy Kaling, Tituss Burgess, and filmmaker Ken Burns.

Coming Soon...

Colt figures out what he wants from Heather. A sick calf gives Beau an excuse to avoid dealing with his feelings - and creates some unexpected bonds.

Seth is joined on the show by January Jones, Savion Glover, Brandi Carlile and Brann Dailor.

Convinced that Sarah is The Executioner's final target, Tom Winston escapes from prison. Also Sarah discovers that Dylan knew about her past prior to meeting her.

The satirical news quiz returns. Regular team captains Paul Merton and Ian Hislop are joined by guest host Stephen Mangan and guest panellists Suzanne Evans and Henning Wehn.

A domestic disaster causes Christine to become Beth and Eric's house guest for a while.

Oscar winner Dame Helen Mirren, Hollywood great Kevin Costner, Scottish star Ewan McGregor, comedy great Ricky Gervais and Australian superstar Eric Bana. With music from Meghan Trainor.