In St. Tropez, France, one team tries to stay on track after failing to read their clue. Teams face off against one another in the second head-to-head competition of the season.

The idea of The Mandela Effect, in which large groups of people remember an alternate history, Mulder and Scully find out how the X-Files themselves may really have originated.

When Jenkins body-switches with a 28-year-old slacker named Jeff, he must find his way back into the Library to correct the mistake. But he will need a team to do it, and enlists the help of Jeff's hapless Dungeons & Dragons friends. Can they make it in time, before Jeff destroys the Library?

A bomb threat on the Compound has everyone on edge, especially Eddie who feels responsible for it. Back with a vengeance, Cal uses information that may affect Vera personally to blackmail her into naming him CEO of Meyerism. In questioning her faith, Sarah discovers that The Ladder may have had another author, a woman, and she was forcefully silenced.

Amidst preparations for the town's annual Picken's Day festivities, Jughead interviews Toni's grandfather and learns some shocking details about Riverdale's history. In an attempt to get closer to Hiram, Archie tries out for the Riverdale wrestling team after learning of Hiram's love of the sport. Meanwhile, Betty unearths some dark secrets about her brother Chic, and Veronica and Josie clash as they prepare for their Picken's Day performance.

When Zoey's Instagram becomes a flooded with haters, she wonders if it's time to alter her brand.

Joanna uses her esteem as partner at CTS to convince a hydrologist to test Millwood's soil. With reluctant permission from the mayor, Joanna and Billy narrow their list of suspects to a handful of industrial sites in the community.

Eric's sister Petra queries police about Olivia's case, and heads south to appeal to Joel for help.

Katie takes Oliver out of school for a day to help loosen him up after Oliver suffers from a meltdown about something minor. Meanwhile, Anna-Kat takes Greg to the park to help him make new friends.

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After visiting a fertility clinic to freeze her own eggs, Esther plans to donate some of her eggs to offset the costs. Meanwhile Benji's paternal instincts kick in as he awaits word on a sperm test.

Teams travel to Les Baux, France where they must construct a catapult.

Alice and Quentin visit her parents; Kady and Julia explore new methods to heal Penny.

Following the disappearance of Travis, Des worries that he and Mary may have crossed a moral line from which they can never return. After jeopardizing Ben's investigation of Olivia, Mary tries to make amends, which has repercussions for a patient in dire need.

When Fallon is taken hostage, the rest of the family must come together to enact a rescue mission - but coming together isn't exactly what Carringtons do best. Out of desperation, Culhane turns to Jeff Colby for help, while Cristal is forced to choose between her old family and her new one.

In the aftermath of a deadly plane crash, Bobby and team race to help the survivors, while Athena deals with panic and chaos at the airport. Bobby confronts his past demons; Athena is out for revenge against a group of teen bullies; and Abby delivers an important message from a 9-1-1 caller.

The MythBusters test ways to beat police road spikes using DIY ingenuity and Hollywood driving skills. Secondly, they investigate if a high-powered fountain can actually lift and suspend a human being.

The heat is on in Flavortown with Guy Fieri's spiciest games yet. First, Guy hands out a list with some must-have ingredients for their spicy chicken dish. Then, in the hottest game in GGG history, Guy spins the brutal Wheel O' Pain to determine which super-spicy pepper they can use in their hometown heat dish. Finally, the last two chefs must cook a dish with some high-end heat with only $20! In the end, only one chef will stand the heat and earn a shopping spree worth up to $20,000.

A sense of doom looms over Kattegat as bloodshed ensues; the defeated army flees in the face of the victors, and a legendary warrior makes his way home.

After feeling unappreciated by Greg and the kids, Katie ditches her family for a day at her favorite hideaway spot and leaves Viv in charge of the household. Viv takes this as an opportunity to see if she really is mom material.

After a number of near-death experiences, Lawrence survived through it all with the assurance of Cierra's online love. But with Cierra blowing Lawrence off whenever they try to meet, Nev and Max must find the truth behind the suspicious profile.

The BAU is called to investigate a series of D.C. homicides where cryptic messages are found inside the mouths of each victim.

Andrew Cunanan arrives in Miami to stalk fashion designer Gianni Versace.

Finally reunited, Sax and Happy make one last push to save Hailey. Amanda pursues a dangerous lead all by herself. Blue and Isabella come to blows over a dark family secret.

The Paris Temple of the Knights Templar is under siege; De Nogaret plants doubt in King Philip's mind; Queen Joan must decide what is best for Navarre.

When a man is reported missing, things don't add up. Edmonton Homicide Investigator Bill Clark takes charge and before long finds himself deep in the world of Internet homicide and the sickening potential that the murder was filmed and for sale to the highest bidder.

After his surgery, Jake's coworkers butter him up in the hopes that he'll share his prescription painkillers with them, and visions of a ghost haunt a sleep-deprived Matt.

Once again in Riverside, Shana and Edwina bring their "Golden Girls Chic" but end up phoning it in. Dave sets his eyes on a messy unit. Rene isn't suppose to be buying, so he sells instead.

Correspondents dash around the globe in an Apology Race to try to make amends for any deeply embarrassing comments made by President Trump.

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Stephen welcomes actor Willem Dafoe, TV personality RuPaul Charles, and comic Roy Wood Jr.

Frankie reconnects with someone important from her past. Despite problems with her knee, Grace refuses to slow down. Robert tries to make amends.

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With his own machinery and help from family and friends, Mike plans to build a large spotted gum clad home, in an off grid, koala filled paradise. However, he faces the challenge of transporting the materials via barge.

Having marked Rome's arrival with blood, Aulus sends envoys to parlay with the tribes of Britannia, while also looking to learn more about the Druids.

Jack and the team find themselves embroiled in the mysterious world of faith healing when a woman is poisoned during a ceremony and all evidence points to the arrogant healer himself.

Derry is welcoming the 'Children of Chernobyl' - teenagers, affected by the Chernobyl nuclear disaster, who have been sent from their contaminated homeland for a few weeks of fresh air to, as Sister Michael puts it 'give their wee lungs a clear out'. The Quinns are hosts to one of these 'children' - Katya. Erin couldn't be more excited - she can't wait to share her wisdom and benevolence with this 'poor Ukrainian girl'. Katya, however, turns out to be sophisticated, confident, sexy and a lot less grateful to be in Derry than Erin had expected, unless you factor in one of the gang. Meanwhile the rest of the family has other preoccupations - a new development in Granda Joe's love life leaves his daughters deeply unimpressed.