Sarah regresses to old habits while struggling to cope with the consequences of her decisions – reconnecting with Beth on a dark night of the soul. Back at the lab, Cosima, haunted by vicious memories and news of Delphine, attempts a dangerous Hail Mary to find a cure. At the Hendrixes, Alison is more determined than ever to create normalcy for her kids. As she forges ahead with a birthday party, Donnie is caught in the Neolution crosshairs.
Rachel is walking very unsteadily on two crutches when she hears a distant sound. Back in her wheelchair she searches the rooms in which she has been confined, and discovers a previously-closed door is now open, leading to stairs upward. Back on crutches, she climbs the stairs to discover a surface-level modernistic house, with windows showing winter outside. There is a living room, and sitting on the couch is Susan Duncan, who welcomes Rachel to The Island of Dr. Moreau.
At the safe house, Siobhan and Sarah are mourning the loss of Kendall, which strikes Siobhan the most. She accuses Sarah of being the cause of "all this", and is sure Sarah will now go back to her "old ways", so she should go, now, and leave Kira.
Alison and Donnie are preparing for a slumber birthday party for Gemma.
Susan shows Rachel a Victorian age book, On the Science of Neolution, by Percival Westmorland, and says this is the true start of Neolution, an industrialist who made a secret society to breed better humans. (By the way, the book does have an illustration of Leda and her dear swan.) Susan was at the forefront of this for years, but now Evie Cho has taken over.
Sarah gets to a bar and starts drinking. She runs into Dizzy and drinks with him, and other fun-loving people gravitate to her. She has no interests other than drinking, dancing, and sex.
Scott and Cosima mourn the loss of all their data, and the only thing they have to start over with is the bot that was removed fron Sarah. For a time Cosima thinks of installing the bot in herself, just in case it helps, but she is dissuaded.
Siobhan goes to Art and passes on Cosima's description of the one who killed Kendall, and to Art it matches Martin Duko, who kept Beth under Evie's thumb, and drove her to try to kill Susan. Art catches up with Duko at the police station and beats him up, both for Kendall and for Beth, though Duko says "they" are watching Art.
Dr. Ian Van Lier congratulates Evie Cho in her success over Susan, which Evie says is just in time, she has had a life of taking immunosuppressants and it's causing problems. Van Lier says, with the new bot this week, her problems will be over.
She has a video conference with Susan and Rachel, and other BrightBorn people, and announces to all that she is in charge of all of Neolution, and the Leda project will be dismantled for its assets. The existing clones can just be forgotten and left untroubled, although Sarah and her friends still need to be stopped. Rachel offers to help, but Evie says no clone will be allowed to take a position of real importance in Neolution.
At Susan's house, Charlotte and Rachel are painting, and Charlotte explains that they are on an island, as big as a country. Charlotte is having more problems with blood when she coughs, and Rachel explains what that is about: it's a problem with all the Leda's.
Dizzy gets Sarah to come home with him, and she's only interested in sex, but he's not, he has other friends with bots in them and want them out, and wants to know how Sarah got rid of hers. She has no answers.
During the Hendrix party for Gemma, police barge in and arrest Donnie for selling narcotics. Martin Duko is with them, mostly to lean on Alison and make sure she knows Neolution is watching her.
Kira and Siobhan discuss Sarah, and Siobhan insists Sarah will be back, but Kira says "no, this time she's following Beth." They call Felix to tell him about this, and he'll go to find Sarah.
Sarah has left Dizzy's, and is walking across a bridge over the trainyard. Throughout the episode she has been seeing visions of Beth, like in crowds or in mirrors, and now she sees Beth again, standing there. Sarah complains about "Beth" following her, but Beth hopes tonight is her last night.
On the way to find Sarah, Felix gets another call about Cosima, and he remembers what Krystal said earlier. He calls Cosima to tell her that Krystal indeed saw Delphine get shot, but then someone came and hustled her away, and she was alive at that point. Felix gets to Sarah on the bridge, and he and "Beth" encourage her to be strong. They go back home.
Rachel comes down the stairs in Susan's house, trips and falls. She has a vision of a swan looking at her, for a few seconds, it seems to be hovering in the air, then it flickers and is gone. She tells Ira she saw it only in her new eye.
- Tatiana Maslany as Sarah Manning/Beth Childs/Cosima Niehaus/Alison Hendrix/Rachel Duncan/M.K.
- Jordan Gavaris as Felix Dawkins
- Kevin Hanchard as Arthur Bell
- Ari Millen as Ira
- Josh Vokey as Scott Smith
- Kristian Bruun as Donnie Hendrix
- Maria Doyle Kennedy as Siobhan Sadler
- Skyler Wexler as Kira Manning
- Rosemary Dunsmore as Susan Duncan
- Joel Thomas Hynes as Dizzy
- Gord Rand as Detective Martin Duko
- Jessalyn Wanlim as Evie Cho
- Cynthia Galant as Charlotte Bowles
- Millie Davis as Gemma Hendrix
- Alison Steadman as Kendall Malone (archive footage)
- Joe Pingue as Detective Troy Collier
- Kirsten Alter as Detective Lindstein
- Brooke Palsson as Elle
- James Cade as Tito
- Ryan Blakely as Reverend Mike
- Scott Wentworth as Dr. Ian Van Lier
- Peaches as herself
- Calwyn Shurgold as Hell Wizard
- Sadie Alter as Gemma's Friend
- Joe Kelly as Bartender
- Alex Spencer as Pedestrian
- Johnny Larocque as Punk Rocker