Humans

When fractures within the Synth community start to appear, all hope of stability comes under threat, and both families are brought back to fight for the Green-Eyes' survival.

Following a police raid at the Railyard, a grieving Max must deal with the fallout of his life or death decision, but have his actions caused irreparable damage to his leadership? Mattie stays by Leo's side, but his recovery takes a surprising turn. Rebel Synth Agnes begins a campaign against humans forcing Max into another difficult decision. Laura has her first meeting with the Dryden Commission and, realising she has a mountain to climb, she finds a possible ally in Dr Neil Sommer. She needs all the help she can get when she discovers a secret operation that could threaten Synth survival. And will Karen and Sam's cover be blown after Joe discovers their secret?

As Leo struggles to come to terms with being human, Mattie takes him back to the Hawkins' home, where a surprise night out allows them to confront their feelings for each other. Laura is determined to uncover the truth about the too-secret Operation Basswood and tries to enlist Dr Neil Sommer's help, only for things to take an unexpected turn. Joe reluctantly decides to help Karen with Sam, and Niska receives a mysterious message.

Laura leads a tense Dryden Commission on a visit to the Railyard, but will Agnes' anger threaten its success? Mia comes face to face with Ed forcing her to confront her past, while an evening out for Karen, Sam and Joe turns to tragedy.

While Sam reels from the events of Waltringham and Joe struggles to help him through it, truths are revealed and dangerous plans put into action at the Railyard.

Stanley and Anatole's true colours put Laura and her family directly in harm's way. With Mia speaking at the commission, Laura must do everything in her power to stop an awful attack. Leo and Mattie return to the Elster house where Leo comes to understand a painful truth, but Mattie has a secret that could knock their fledging relationship off course. Niska continues her mysterious journey that takes her to Wales, where she must defy all her instincts to survive.

Max must confront a friend turned foe. Laura reels from her heartbreaking decision, but when Mattie reveals her secret, she is spurred back into action. Niska's journey takes an unexpected turn, while Leo races to be by Max's side, but walks into danger.

Laura is in a race against time to stop Basswood. Her reputation is already on the line - but is she willing to give up her family and her freedom to save the Synths? Meanwhile, it looks as if Niska has reached her journey's end, while Mia, Leo and Max stand together in final battle, with seemingly little hope of making it out alive. And when the world learns of the atrocities that are taking place, will the fate of Synths change for ever?