As night falls, Deloris - and Fred - get into trouble. Later, the "parents of the year" track their prey. Viv uncovers more about her powers.

Giorgio Tsoukalos and David Childress explore the mysterious chain of manmade islets in Micronesia's Nan Madol; built from 250 million tons of volcanic rock, there are local legends that strange visitors floated the massive rocks through the air.

Adam Driver hosts with musical guest Halsey.

Grace and Frankie prepare for their pitch, but their prototype is missing. Robert keeps a secret from Sol. Brianna gets an appealing offer.

To celebrate their last Thanksgiving on the ranch, Colt and the guys go on a turkey hunt. Mary checks into rehab.

In Greendale, Sabrina explores a new hobby... and a disturbing duty. Elsewhere, Prudence and Ambrose continue their search for Father Blackwood.

Annie starts her freelance career by interviewing the Troll. Fran is heartbroken after she finds out Vic is not exclusive. When no one reads Annie's article, she realizes going freelance may not be as positive a move as she thought when she quit The Thorn.

Jade searches for her singing voice and befriends an aspiring rapper-producer. Pressed for time, Mazzi asks M'Dear for help with a school project.

Ko Sho Blo! Trigger-happy space police the Judoon are targeting 21st-century Gloucester. The Doctor, Yaz, Ryan and Graham race back to Earth in order to prevent them doing too much damage to the cathedral city. But who are they looking for, and what did they do to incur the wrath of the Judoon?

Cleaner Luke Sumner's body is discovered close to his flat in Newcastle, but pathology concludes that the killing blow could have occurred several hours before he succumbed to his injuries, prompting Vera to piece together the victim's final hours in order to investigate his murder. But Luke lived a simple life and had even severed all ties to the quaint rural village where he grew up - including his mother Carmel. Can she shed any light on her son's murder?

Paddy McGuiness, Chris Harris and Freddie Flintoff go on a road trip in a trio of affordable second-hand convertibles. On the test track, Chris puts the new Ariel Atom through its paces, while Freddie goes bungee jumping off a dam in an old Rover.

Sister Julienne volunteers to put up four trainee doctors at Nonnatus House while they undertake the practical aspect of their obstetrics diploma, hoping the exercise will remind the council how vital the home is to the community and help remove the threat of demolition. There is a lot of excitement about the new arrivals and the doctors don't disappoint. On his CDC rounds, Fred comes across a street marked for demolition, with one house clearly showing signs of life.

Tabby has a disappointing visit with her estranged mother while Julia, Johnny and Finn try to save an adorable endling. When Tabby falls in love with the new creature and tries to hide it, her feelings threaten the safety of her foster family.

Abiona joins Johnny and Julia's search for a new sightless endling, while back at the farm Tabby tries to keep Finn and Mr. Leopold from discovering the creature she's hiding in the house.

Mehmed's men dig underground tunnels in an attempt to shatter city walls. The tides turn against the Ottomans when a naval blockade founders.