Mia and Ed get closer but their relationship is thrown into jeopardy when their secret is discovered. Toby gets closer to Renie but offends her when he breaks through her synthie mask.
When Mia risks falling into the hands of a mysterious organisation, she is forced to take drastic action. Odi struggles to find meaning, while Sophie is awestruck by Renie's 'Synthie' lifestyle.
Athena challenges Milo's ethics and is shocked when he reveals his real plan, Mia's surprise return has ramifications for the Hawkins family, and Mattie finds Leo but can she trust him with her secret?
When Mattie reveals that the Synths are planning to break into the Silo, Laura is determined to find Niska and ask for her help. Mattie asks Max to help save Leo from Hester's influence.
In the aftermath of the Silo tragedy Karen feels she and Sam have no future and takes matters into her own hands. Niska and Astrid prepare to return to Berlin, but can Niska really walk away from her family?
One year on from the release of the consciousness code, a catastrophic event threatens the future of humankind and synth-kind alike.
A grief-stricken Max is forced to deal with the consequences of his life or death decision; Laura discovers that she may be being kept in the dark at the Dryden Commission; Joe finds out about Karen's secret.
Laura is determined to discover the truth behind Operation Basswood and tries to enlist Dr Neil Sommer's help to do so. Meanwhile, Mattie and Leo return to the Hawkins home as Leo struggles to cope with his transition.
Agnes's fury threatens to ruin the Dryden Commission's success, while elsewhere Mia is forced to confront her past when she comes face to face with Ed.
While Sam reels from the recent events of Waltringham, and Joe struggles to help him get through it, truths are eventually revealed, and dangerous plans are put into action at the Railyard.
Laura discovers a shocking and dangerous truth. As Niska continues on her mysterious journey, she must defy all her instincts in order to survive.
DS Pete Drummond
Dr. George Millican
© 2015 Kudos Film & Television Limited
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