When Adam takes Beverly to her high school reunion, a la "Back to the Future", he tries to end a reality where she winds up with the wrong man. Meanwhile, Barry and Joanne make a surprising decision to prove the seriousness of their relationship.

As Iris receives word of a career milestone, Barry is suddenly nowhere to be found. In trying to get back home, Barry runs across many familiar faces. Khione continues to figure out her powers and Chester works on a suit for Allegra.

The fate of the hospital rests on the vote of an incapacitated board member. Archer helps a mother with a rare stem cell disease while Hannah treats the woman's pregnant daughter. Charles encounters a schizophrenic patient with a serious hearing impairment.

At her wits end over Archie's recent actions, Mary turns to Uncle Frank to get him back on track. Meanwhile, Betty asks Veronica for help understanding her sexuality. Elsewhere, Jughead takes action after he discovers plagiarism taking place at Pep Comics, and Cheryl and Toni's budding attraction catches the attention of some River Vixens.

As Mark's graduation approaches, he considers his relationship with his father. Meanwhile, Louise plans a big graduation ceremony at the Lunch Box.

It's the Quarter Finals on The Masked Singer, and the British are coming! Watch the final four compete for a spot in the coveted Semi-Finals, performing hit songs from artists across the pond. Only one will be unmasked!

Castaways must land a win at the reward challenge to earn a night at the sanctuary and letters from home. Then, castaways will need to snake their way toward a win in the immunity challenge.

When Miranda asks Calvin to switch weekends, he disregards his plans with Laura. Meanwhile, Curtis and Floyd have a fight about business.

Nell agrees to see Phillip, hoping for closure. Sam and Lexi have a joint birthday party for their daughters.

Boden, Ritter, Herrmann and Kidd work together to take down a local politician responsible for a chemical fire. After his aunt's accident, Gallo worries about their future. Brett steps in to perform Dylan's magic show when he's out of town.

Nell holds a dinner party at her house and Dennis has to make a potentially life-altering decision.

Atwater's worlds collide when there's a shooting at the building he owns in Burnside, which leaves a child dead. Atwater must confront his relationship with his father, Lew, as the brutal case forces them together.

A tight-knit circle of friends is reminded that friendship is a million little things.

Dave makes a big decision about tour, but it blows up in his face. 

In flashbacks to her dad's Shiva, Sam is at odds with Carol while grappling with their own grief and dealing with her judgy Aunt Alice. In the present, Sam and James reunite at an AA funeral and fall into old patterns.

Harry and Helen go undercover as American diplomats to befriend and recruit the Pérezes, a couple with connections that can help Omega Sector take down a rogue general who has gained missile-launching capabilities. The mission takes a turn when they realize the Pérezes have a secret of their own.

At Olivia's baby shower, Sam is forced to accept that she needs a new sponsor, but doesn't hit it off with Olivia's suggestion. Carol visits Felicia and the two discover they have more in common than they thought.

While watching Henry, Ted fights the urge to spiral when Michelle and Dr. Jacob go on a romantic trip. An online leak has massive implications for Keeley.

On a special day for the Mularkey family, Tully reflects on decades of work, love, grief and joy alongside her best friend. Kate faces the unknown.

Remember how a talking tree named Groot became a Guardian of the Galaxy.

After an eventful, obstacle-strewn journey to find a safe haven, Gus learns more about his origins and how far Birdie was willing to go to protect him.

Will there be a happy ending? Josh and Melissa are presented with a life-changing choice.

Izzy opens up to Cass about her past. Dusty confronts Giorgio. Mr. Johnson's magic show sets the stage for shocking revelations.

After Esvet runs away, a devastated Dimitri asks for Peyami's help. Sülün insists on Firuze marrying Mustafa, but Peyami confronts his grandmother.

As John and Vivian go head-to-head in a mediation over his food truck, Hendrix is pulling out all the stops to save his marriage.

A former Sith apprentice, leading a peaceful, but isolated life, is confronted by the past when her old master tracks her down.

it's time to meet everyone's imaginary friends in a domestic and poignant setting. Greg Davies has some tricky judging to do when people question the definition of the colour gold, and nobody understands a simple egg-shelling task.

Gareth is definitely going to be working from home today. Just to be on the safe side. He doesn't want to push his luck. Because today just happens to be Friday the 13th.

The gang head to Colombia to meet the cartel, headed by the infamous Pablo Escobar, to discuss their gold for cocaine trade. Meanwhile, Tash's friendship blossoms with undercover Detective Thread and Sidney has an unexpected visitor at his beach bar.

Jon considers faking his own death as Lucy gets to work on her sketch show, but when Sally Phillips gets cold feet, Lucy must get another genuine comedy legend on board.

In an emotional reunion, the sisters find their father but realise that maybe he isn't what they needed in the first place.