With dreams of World Championship glory only a few weeks away, anxious, desperate, and dangerous robots are barreling into the arena and putting everything on the line. Tonight, more teams will wrap up their qualifying season with their fourth and final fight. While some seek a coveted top seed in the tournament, others just want to avoid a humiliating defeat. As the roller coaster ride to the Giant Nut nears its apex, it's the last chance to hop on board for the ultimate robot ride.

Georgie goes on a birthday date and Mary confronts Brenda about her relationship with George. Also, Sheldon takes an interest in Missy's favorite TV show.

Emotions boil over at the station as the team chafes against Theo's leadership style. Carina enlists Ben and Maya to help her with a patient in an uncomfortable position. Natasha and Sullivan's relationship hits a roadblock.

A key piece of evidence emerges as the list of victims begin to grow, and those seemingly involved with the death of Margaret Mehar begin to panic as they're pursued by both Rijkers and the Widow.

It's Maggie's last day. Amelia's relationship with Kai is tested, and Ben worries as Bailey's doxing intensifies.

After learning that Pete's daughter, Laura, is getting married, Sam, at Pete's behest, tries to convince her to hold her wedding at Woodstone B&B. Also, Alberta and Isaac team up to solve the mystery of what happened to Crash's head.

Margaret helps a client who lost his mother during a routine surgery at Allison's hospital, performed by her colleague Dr. Ross Woods. Also, Margaret and Gus go on their first date and Todd is asked by the firm to investigate Gus.

Animal Control dispatch radios with a goose on the loose. The precinct hosts an adoption day.

Willie gets an unexpected boost at the perfect time; Ronnie and Timmy target a monster terrorizing a local marina; Don hustles to impress the "King of the Swamp" as Leron and Porkchop take on their most ambitious day ever.

The Jokers are dishing out as waiters, and later grilled by news anchor Rosanna Scotto. Finally, the losing Joker is in for a horrific treat with guest star Bruce Campbell!

With Levi's help, a patient celebrates a milestone. Jo processes a difficult diagnosis, and Maggie and Winston decide their future.

Mariana struggles to navigate her changed relationship with Evan. Dennis and Davia are both busy in their careers, but are they still able to make time for one another? Alice, Malika, and Gael let off steam at a local Queer Night.

The CSI team investigates a bomb that detonated during a masquerade party for wealthy investors at the site of a new casino.

The chefs are shocked when they discover this week's Quickfire Challenge is the midseason finale of Last Chance Kitchen. They enjoy afternoon tea as they help Padma and Tom decide on who should return to the competition. The chefs take a trip to Highclere Castle for the Elimination Challenge, where they must work together to create and serve an elevated picnic basket. Will the teams be able to produce high-end picnics that can impress Padma, Tom, Gail and guest judge and notable pastry consultant Graham Hornigold? Who will be asked to pack their picnic basket and go?

In the wake of Sebastian's transformation, the Titans race to retrieve Traigon's horn, leading them to the quaint - but eerie - town of Caul's Folly.

Zac is tricked into a dinner intervention by Fatima, and some ugly truths are revealed; Bryce admits to his big-girl fetish and other acquired tastes.

Stephen welcomes actor Nicolas Cage and a musical performance by Christine and the Queens.

With Dick and Kory at risk of falling victim to the spell of Caul's Folly, Bernard and Tim attempt to crack the town's mystery before it's too late.

A devastating revelation about Jack alters the course of Picard's life forever - and uncovers a truth that threatens every soul in the Federation. The final battle begins as Picard and his crew race to save the galaxy from annihilation - but not without a gut-wrenching cost.

Will discovers the truth about his teammate's absence, making him question his future. Carlton spirals out of control.

Zac's childhood trauma causes new issues in his relationship with Fatima; Fatima's parents meet Zac for the first time, and it's a disaster.

Questioning their existence, the spirits seek Mr. Martin for answers. Maddie must confront the latest suspect which challenges everything she thought she knew before. Xavier, Claire and Nicole look for answers at an abandoned house. When the truth is finally revealed, Maddie must face unexpected and devastating consequences.

Oumar seeks revenge - and insurance - after the police confiscated his stash. Yasmina decides she's had enough; Souhila reassesses her parenting approach.

Painful memories of her youth push Amy to confront her family issues and marital woes. Danny spins an elaborate lie that leads him down a dangerous path.

William and Ingrid look forward to meeting Jay's new girlfriend, Anna. But before their formal introduction, William and Anna lock eyes - and sparks fly.

School elections are approaching and both sides reexamine what they stand for. Newcomer Hazel is on her first day at Rydell and tries to remain impartial - and invisible.

Petit plans a desperate rescue operation. Realizing that Marseilles is no longer safe, Mary-Jayne, Albert and Varian all face heart-wrenching decisions.

Clare and Amy attend a writer's retreat, but when Amy gets great news, Clare can't help but question if her sacrifices for Danny and their family have been holding her back. As she remembers her first marriage to Jess, she wonders: should she stay or go?

Ex-cop Mike seizes an opportunity to pay off his gambling debts and heads to Florida, where he reunites with his dad and makes a startling discovery.

James welcomes actor Ben Affleck and actor Chris Messina.

Team Spidey and Black Cat join forces to stop Doc Ock from destroying the precious Maltese Kitten.

Miles and Black Panther's special day is nearly spoiled by Electro.

Darcy discovers just how bad things are at home for Billy, and he has to decide whether to tell Mr Stewart. Meanwhile an English assignment forces Rani to find her voice.

Billy and Rihanna run away - but can the gang catch them in time?

Rob Brydon, Lee Mack and David Mitchell return for another episode of previously unseen material from Series 16, featuring Motsi Mabuse, Bez, Sarah Greene, Joe Wilkinson, Snoochie Shy, Lucy Martin, Anton Du Beke, Jo Brand, Steve Pemberton, Shazia Mirza, Lucy Beaumont, Tom Allen, Amol Rajan, Bob Mortimer, Professor Alice Roberts and Morgana Robinson.

Guest presenter Charlie Brooker joins Ian Hislop and Paul Merton as they delve into the news.