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M.K., a Leda clone wearing a sheep mask, witnesses two paramedics burying a man in the forest. She phones Beth Childs, who visits the scene the next day with Art, discovering the dead man's cheek chopped out. M.K. tells Beth that the dead man is linked to neolution. Beth visits Club Neolution, where body-mod Trina informs her of the self-directed nature of Neolution. Olivier reports Beth's visit to Aldous Leekie, and they consider whether Paul has lost control of her. Beth visits Leekie hoping to gain more information where Evie Cho recognizes her as a Leda clone. Beth installs borrowed surveillance equipment in her apartment. Trina contacts Beth concerned for her boyfriend. Beth finds the paramedics killing Trina's boyfriend, under Detective Duko's supervision and the guise of operating on his cheek. Beth inadvertently attracts their attention, and mistakenly shoots a bystander—later revealed to be Prolethian Maggie Chen. Beth calls Art, who helps cover for her. Detective Duko is positioned to help Beth through the investigation, unaware that she knows his real role. In the present, Sarah's Icelandic retreat is interrupted by a phone call from Art and M.K., who warn Sarah to flee as Neolution has found them.

32 2 "Transgressive Border Crossing" John Fawcett Russ Cochrane April 21, 2016 ( ) 224086-31 0.271[31]

Sarah, Kira, Mrs. S, and Kendall flee Iceland. Helena learns she is having twins which causes Alison to yearn for her own children. Cosima is upset about Delphine's disappearance. Sarah determines that to learn about Neolution they must contact M.K. Knowing Beth was in contact with her, Sarah and Art investigate Beth's final days. They discover Beth was spying on Paul and had contact with Trina. Sarah and Felix go to the Neolution club, where they argue when Felix reveals he has been searching for his birth family. Sarah encounters Dizzy, who mistakes her for M.K. and shows her a video of an operation on a Neolution follower which kills him when the cheek implanted bot is ruptured. She tries to meet M.K., who reveals she feared 'it' would kill Sarah like it killed Beth. In flashback, Beth tells M.K. to "watch the others". Neolution paramedics attack Sarah, believing her to be M.K., but retreat when they discover it is actually Sarah. Sarah later discovers she has a bot implanted in her cheek. Kendall reveals to Scott that she has leukemia.

33 3 "The Stigmata of Progress" Ken Girotti Aubrey Nealon April 28, 2016 ( ) 224086-32 0.242[32]

Ira, a Castor clone raised outside of the military by Susan Duncan, examines Rachel's new eye. Susan, Charlotte's new guardian, returns to the Island after unsuccessfully attempting to track down Kendall. Kira senses things and she is not happy with people keeping the truth from her. Cosima examines Sarah's bot but they are unsure of its purpose. Alison and Donnie begin to dig up Dr. Leekie's body in the hope that he possesses an implanted bot (as most high level Neolutionists do) for Cosima to study. As they begin to excavate, the police arrive to investigate the murder of Pouchie's drug ring, who were in possession of Vote Alison Hendrix campaign material, forcing Helena to play Alison during the detectives' interrogation. Sarah meets Felix's biological half-sister Adele and immediately doubts her intentions, causing Sarah and Felix to split on bad terms. Alison and Donnie inform Cosima that they killed Leekie and have his bot for her to examine. Art sees on Beth's surveillance video that Detective Duko visited her. Art finds information on the man whose bot exploded (on the video that Sarah saw at the club last episode). With Art's intel, Sarah visits a dental clinic where one of the employees recognizes her as Beth, who previously investigated there. She promises to remove the bot but seemingly pierces it instead, telling Sarah not to move as the toxins will kill her, and claiming that she has contacted her superiors, calling her lucky to be implanted with the technology. Ferdinand arrives instead, killing the dentist and freeing Sarah as she would already be dead had the bot actually been pierced. Rachel learns for the first time that Charlotte was cloned from herself. Rachel gets word to Ferdinand that Susan is alive. Susan, after telling Rachel that she does not love her, apologizes for her detachment and informs her that their purpose is for the greater good; to control human evolution and create a more perfect human being.

34 4 "From Instinct to Rational Control" Peter Stebbings Alex Levine May 5, 2016 ( ) 224086-33 0.218[33]

Ferdinand, having saved Sarah, convinces them to decrypt files that Rachel sent him, as the files could lead to Susan Duncan who can probably deal with Sarah's bot. After Leekie's head containing the bot is delivered to Cosima, she and Scott begin investigating its true purpose. Trina, mistaking Alison for Beth, confronts Alison in a diner for investigating Lifespring Fertility Clinic, having been a carrier and trusting Beth in confidence. Posing as a gay couple, Felix and Donnie visit the clinic looking for information on Brightborn conception technologies. With Alison becoming more emotional about her (in)fertility issues, Helena buries her expired nitrogen eggs and leaves the Hendrixes behind. Sarah goes to M.K. for help decrypting Rachel's files. Realizing that Rachel and Sarah are collaborating with Ferdinand, M.K. lures him to Beth's house and tricks him into sitting on a pressure bomb. M.K. confronts him for the Helsinki event, which wiped out multiple clones and their friends and family, including M.K.'s best friend Niki, another Leda clone. The letters "M.K." were from clone number 3MK29A whose name was Veera Suominen, a clone that escaped the purge and now plans revenge on those responsible for the deaths. Sarah turns up to stop M.K./Veera, needing Ferdinand alive to help remove the bot in her cheek, which Cosima has discovered is performing gene editing to change her DNA. M.K. leaves with Ferdinand's money. Mrs. S defuses the bomb and Sarah declares that her score with Ferdinand is even. Elsewhere, knowing Charlotte is sick, Rachel makes the case that Charlotte should be left to die, refusing to intervene with her illness as the data would be invaluable. Susan agrees but reveals that she knows of Rachel's contact with Ferdinand. Cosima and Scott watch the Brightborn Fertility information video, presented by Evie Cho.

35 5 "Human Raw Material" David Wellington Kate Melville May 12, 2016 ( ) 224086-34 0.223[34]

Sarah discovers that Brightborn owns GeneConnexion, the company that united Felix and Adele, so she sends their DNA to Scott to verify the familial match. Cosima goes undercover at Brightborn with Donnie, posing as a surrogate mother. Evie Cho is present, and the two fear that the high-level Neo would recognize a clone. At the same time, Krystal Goderitch continues investigating and poses as a prospective parent. Evie spots Krystal and informs Susan (who is visiting with Ira), but they mistake her for Sarah. While Cosima searches for Brightborn's lab, Donnie is shocked when he sees Krystal. Elsewhere in the building, Susan meets Cosima who is unaware of Susan's identity, and discuss Brightborn's policies and techniques. Cosima steals her swipe card that gives access to secure areas. Later, Adele turns up to a family meal and after arguing with Felix, Sarah discovers that the two are indeed related and apologizes. Detective Duko warns Art to drop his interest in Beth. Alison confesses to Sarah that Helena took off. Donnie presents himself to Krystal as a Brightborn spa employee, and she shares her misguided suspicion that Dyad and Brightborn are putting stem cells in cosmetics. Roxie and Evie lock Krystal in a room, thinking her to be Cosima. Susan directs Krystal's release because she is harmless, then Krystal spots Ira in the building and begins to scream. Cosima comes across a pregnancy where the baby is delivered with severe deformities. When Susan walks in, Cosima realizes who she is and the two dispute the moralities of experimenting on human lives. Susan offers Cosima the opportunity to collaborate with them and to create a cure using the original's genome. Kira tells Sarah that she feels each of the Leda sisters.

36 6 "The Scandal of Altruism" Grant Harvey Chris Roberts May 19, 2016 ( ) 224086-35 0.248[35]

In a flashback, Beth wearing a blonde wig enters a private Brightborn event with Susan and Evie in attendance. When Susan leaves the room, Beth follows and holds a gun to her head, threatening to kill her. Susan argues that as the leader of Neolution, she is also protecting them and that she genuinely loves the clones. Beth leaves without shooting. In the present, Krystal turns up at the police station seeking protection from the guys who look like Castors. Art spots Krystal and arranges for her to meet Felix. Krystal reveals that she saw Delphine get shot. Evie confirms that Sarah's bot is attempting to isolate the gene making them sick by activating specific genes in Sarah. Running out of time, Sarah and Cosima take up Susan's offer to share Kendall's genome, without consulting Mrs. S. Refusing to share the Castor pathogen by sharing Kendall's genome, Cosima suggests isolating the Leda cell line, using Kendall's cancer cells which have multiplied from a single Leda gene and thus have not impacted the Castor gene line. After Evie and Cosima remove Sarah's bot, she returns home to find Kendall's cigarettes in a pool of blood and that Kendall cannot be contacted. Sarah destroys the samples and they take Susan hostage, believing she orchestrated Kendall's abduction; in turn, Cosima is taken hostage at Brightborn. Sarah believes Ira is behind the attack after denying him a cure but he is found unconscious after attempting suicide by drug overdose. Brightborn wipes Scott and Cosima's research and they realize that Evie is behind the attack, wanting Leda destroyed. Duko prepares to burn Kendall to death and destroy Leda's hope of a cure, as instructed by Evie. Evie grants Cosima permission to say goodbye before Kendall is murdered. Evie tells Cosima that Delphine was shot dead, before instructing her to tell Susan that the original is dead and to tell Sarah that it is over or Beth died for nothing. A flashback reveals that Evie misled Beth to kill Susan and, Beth having not followed through, Evie threatens Beth by saying that she knows too much and should use the gun on herself to save her sisters. Beth, after physically attacking Evie, is shown walking to the train platform after saying goodbye to M.K.

37 7 "The Antisocialism of Sex" David Frazee Nikolijne Troubetzkoy and Graeme Manson May 26, 2016 ( ) 224086-36 0.258[36]

With their hope of a cure gone, Sarah and Cosima both attempt to come to terms with their input in the deal that led to Kendall's death. Alison pushes forward with Gemma's birthday party to maintain a sense of normalcy. Susan returns to the Island and informs Rachel of the creator of Neolutionism, Dr. P.T. Westmorland, noting that he built the facilities they live in over a century ago. Mrs. S disowns Sarah who begins to spin off the rails, drinking, partying and taking drugs. Sarah's story starts to parallel Beth's and she begins to hallucinate her. Art confirms that it was Detective Duko who killed Kendall and proceeds to attack him. Duko tells him that Neolution are after Art next. Evie has pending approval for her gene therapy technology and plans to dismantle Leda for their assets, cutting loose naive clones and terminating the self-aware clones while refusing to allow Rachel to take a position of importance within Neolution. Police interrupt the Hendrix slumber party and arrest Donnie on suspicion of narcotics trafficking. Duko then shows up and ominously says that he and Alison will be staying in touch. Sarah finds herself at the train station where Beth killed herself, conversing with her one last time. Cosima decides to experiment on herself by inserting Sarah's bot (which she stole from Brightborn) in her own cheek, as it could cure her or her death could help the Leda clones learn about the disease. Felix talks Cosima out of it, informing her that Krystal saw Delphine get carried away alive after being shot. Felix then arrives at the train station, where Sarah contemplates jumping. He and Beth's apparition talks Sarah out of it and she steps down and returns to Mrs. S's home. M.K. hacks Kira's computer. Kira calls her the girl in the shadows. Rachel sees a swan in her prosthetic eye.

38 8 "The Redesign of Natural Objects" Aaron Morton Peter Mohan June 2, 2016 ( ) 224086-37 0.245[37]

Jailed for drug trafficking, Donnie meets a Neolution plant who threatens him. Alison visits him in jail, with Felix and Adele (a lawyer), who is surprised to see Sarah's 'twin sister'. Donnie reveals the Neolution threat and believes he won't survive his prison sentence. M.K. contacts Sarah and meets Cosima, revealing that she has traced Susan and Rachel's location, revealing Evie's plan to dissemble Leda and her threat to wipe out the sisters. M.K. helps Sarah and Cosima to contact Susan on the Island to scientifically team up. Susan agrees, but Cosima forces Rachel and Ira out, refusing to trust them. After sending Sarah more information on Duko, M.K. begins coughing up blood due to the same disease killing the Leda clones. Mrs. S, furious over the death of her mother, takes out her sniper rifle to kill Duko. However, Alison arrives to confront him. Duko gives Alison an ultimatum: turn over Sarah's location or allow Donnie to die; Alison and Donnie are simply caught in the crossfire and the Neolutionists only want Sarah. After being given the day to think about it, a fraught Alison is visited by Felix. Alison seemingly makes the deal, giving Duko Sarah's location when Donnie is threatened with death. Duko walks into a trap and after he calls off the attack on Donnie, and reveals Evie's plan to implant bots into millions under the guise of gene therapy, Mrs. S shoots him dead. Cosima comes up with a possible cure: fertilizing Leda eggs with Castor sperm from Ira to create an embryonic stem cell. Sarah hesitantly agrees, and with Sarah's eggs Cosima flies to the Island where Susan waits to work with her. Rachel's swan visions become more vivid and a man appears too. Rachel wants to get back to work and restore Susan's place at the head of Neolution.

39 9 "The Mitigation of Competition" David Frazee Alex Levine June 9, 2016 ( ) 224086-38 0.291[38]

Cosima and Susan collaborate on the Island. In the city, Sarah and Rachel begrudgingly team up to bring down Evie; Rachel suggests that they find two carriers, Tabitha and Kendra, who fled BrightBorn with video evidence of deformed newborn being euthanized. Tabitha is found dead in a pregnancy shelter, supposedly having committed suicide. Sarah sees Trina leave the shelter, and still believing her to be Beth, Trina tells Sarah that Tabitha's death was not a suicide. Trina asks Sarah to find Kendra in Tisdale, and an investigator overhears and tells Evie. Helena, who has been living in the woods, takes a phone call from Sarah. Donnie is released from prison and Adele begins to become suspicious about the family, furthered when Helena returns from hibernation and arrives at Felix's apartment. After a standoff, Adele agrees not to ask questions and leaves on bad terms with Felix. Sarah and Art track down Kendra and eventually convince her to go with them, just as Neolution arrive. Art holds them off while Kendra receives a call from Rachel threatening to give one of Kendra's children (currently staying with relatives) to Neolution if she does not go with Ira, who shows up to drive Kendra to the city. Evie Cho is preparing for a press conference regarding the government approval of her bot technology, which uses germline editing to alter DNA. Sarah confronts Ira who reveals that Rachel is with Evie. Rachel, claiming to want to make a deal with Evie and become head of Neolution in exchange for the video evidence, records Evie admitting that Brightborn euthanizes deformed newborns. During the press conference the new recording is pushed to every reporter's phone, causing them to mob Evie as Rachel looks on. Neolution paramedic Frank captures Alison and Donnie for information on Duko's disappearance. Frank ties them up and attempts to insert a fatal bot in Alison's cheek but Helena bursts in and kills Frank. Rachel's hallucinations intensify and she sees a tribe-like village, a young brunette girl, the killing of a swan, and a bearded man staring at her. Delphine is shown to be alive.

40 10 "From Dancing Mice to Psychopaths" John Fawcett Graeme Manson June 16, 2016 ( ) 224086-39 0.325[39]