Caroline shares news that forces Dr. Charles to make a serious decision about their relationship. Maggie meets her sister's new boyfriend but danger may lie ahead. Dr. Rhodes experiences a huge loss. Dr. Choi and April face an unexpected challenge.

Lucifer and Chloe investigate a teacher's murder. Meanwhile, Lucifer goes to extremes to convince Eve to dump him, and Amenadiel mentors a teen.

Self-absorbed professor Jacob learns that a former student is penning an unflattering graphic novel about their relationship.

After receiving mysterious invitations, Archie, Betty, Veronica and Jughead band together to confront the evils of their past once and for all. Meanwhile, chaos ensues at The Farm after Edgar makes a chilling announcement.

On the night of a school gala, the gang is convinced they know who killed Nolan and set out to prove it. However, Dana continues to complicate their lives by exposing a critical secret between the Perfectionists.

One castaway's game unravels and someone gets a chance to return to the game when the castaways "living on the edge" compete head to head. In the end, one castaway will take home the $1 million prize and earn the title of Sole Survivor.

Jane is having a hard time dealing with Rafael avoiding her, so when an issue with Mateo comes up she uses it to get some face time. Rogelio turns to Jane for help when he learns his pilot is in trouble. Alba and Jorge enlist Xo's help to study for their upcoming immigration test. Meanwhile, Petra finally gets to the bottom of who has been terrorizing her.

To honor a bet that he lost to Mark, former New York Yankee Alex Rodriguez works a shift at the Fenway Wahlburgers restaurant; Mark and Donnie plot to exponentially increase Paul's Instagram followers; Phyllis and Alma take an oil painting class.

In the third round of the Battle of the Branches, four Marines are tasked with forging the KA-BAR. As an additional challenge, these smiths must adapt and overcome to forge together metals from a massive anchor using the San Mai technique. After a punishing round of testing, the two surviving smiths return home to forge the Marine Corps Officers Sword.

Flavortown has witnessed the creativity of countless chefs, and Guy Fieri wants to focus that creativity on one of his favorite foods: sandwiches! Guy brings four sandwich-making savants to Flavortown Market to test their skills between two slices of bread. Delicious deli meats, fancy condiments and artisan breads go flying as these sandwich superheroes make fried, international and stacked sandwich masterpieces. One will walk away the winner with up to $20,000 of dough.

A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire. Firehouse 51 celebrates a retirement party.

Antonio struggles with his guilty conscience as he tries to take down a major drug dealer. In order to protect his team, Voight takes a big shot at Kelton.

Brockmire deals with sobriety-induced impotence and Matt's declining health. Brockmire's sponsor reminds him that he needs to find a higher power if he wants the AA program to rid him of his anxiety.

Four U.S. Navy officers must forge a multipurpose naval Mark 3 dive knife with metal from a giant anchor chain; two sailors return home to re-create the intricate and iconic naval officer's sword.

Smoothie + Hailey take a trip into the past. Sax hits rock bottom. Good thing Happy brought a cake.

Frankie's commitment to cold-hearted professionalism is tested when the team's new mission to take down the head of a massive drug operation reunites her with a former guardian. Meanwhile, Jai and Standish discover that Susan has been writing psych evaluations on every member of the team, and their curiosity leads them to an unpleasant surprise.

Nadja trains Jenna on how to take her first victim, and Nandor applies for American citizenship.

Louise and Tom reflect on why and how they got together in the first place.

The castaways reunite to talk about their experiences.

Full Frontal offers an important Sex Ed class for Senators, discusses the "electability" of Joe Biden, and sits down with the very electable Kamala Harris.

Radio show host Howard Stern; Of Monsters and Men performs.

Stephen welcomes podcast hosts Jon Favreau, Jon Lovett and talks with musical guests Tommy Vietor, and BTS.

Audrey enlists Marius' help in the search for Lila. They soon discover that her life was far more complicated than they had ever expected. Simmering conflict over Lorraine comes out into the open as Otto and Taylor set out on a cross-country road trip to track down Lizzie.

Allie questions Elle about Campbell. As the town grows restless awaiting Allie's decision, Will and Grizz push for harsh measures.

James welcomes actress Octavia Spencer, actor Henry Winkler, and comic Sarah Tollemache.

The bottom team from the previous challenge are presented with an array of condiments they must identify correctly. The first five to guess incorrectly head into an elimination cook. Plus, a Masterclass with Nigella.

With Huey's and Webby's help, Fenton woos a punk-rock scientist, Gandra Dee, only to uncover her dangerous plans for Gizmoduck.

As Ben, Ainsley, Harry and Liz kick off their housewarming celebrations, Heather doses herself up on a concoction to combat her urge to return home.

Big Hero 6 attempt to thwart a bank robbery and are defeated by Supersonic Sue, a old school roller-skating villain.

Miller, along with Amanda Jones, flies to Mali to contain an increasingly unstable situation. In order to make sure a deal gets over the line, he hatches a plot that will tie up a number of loose ends for him.