Six months after her life unraveled and dark secrets were revealed, Molly is confined to a psychiatric hospital when she learns of bizarre deaths that sound eerily similar to those she witnessed in space. When she escapes to investigate, she crosses paths with JD Richter, a determined cop who just signed on to the case.

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Molly and J.D. discover another pregnant woman who is suffering from inexplicable and fatal symptoms. Meanwhile, Molly begins to question her own mental stability. Julie struggles with Ethan's rebellion.

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Molly finally learns the frightening truth about what happened to her son. Also, Julie’s decision to erase Ethan’s memory has disturbing consequences.

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As Molly works to create a virus that will eradicate alien hybrids, she discovers that aliens are trying to communicate with humans through a hidden message in their DNA. Also, Lucy helps Ethan run away from Charlie in order to help him recover memories of his mother, Molly.

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Molly discovers Ethan is alive and sets out to get her son back. Also, suspicions about John’s death cause JD to investigate Julie’s potential involvement.

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Molly panics when she discovers she is changing physically – the question is into what, and whether she can reverse what’s happening to her. Also, JD’s ex-wife, Dorothy, shows up suddenly on his doorstep to discuss their daughter.

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Molly and JD try to convince Shepherd to broker a peace between humans and hybrids. Meanwhile, Lucy tries to manipulate Charlie’s feelings to put him in a compromising position.

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Molly tries to save her son following a raid on the hybrid compound and JD tries to rescue his daughter from Shepherd. Elsewhere, Lucy becomes a bigger threat to humans.

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As Molly succumbs to the virus, long forgotten memories surface. Also, Julie is confronted with hard choices and the Hybrids seek revenge.

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Following a near-death experience, Molly has a harrowing vision she can’t shake. Also, Shepherd's loyalty to the Global Space Commission is called into question.

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Molly, JD and Ethan track down John’s mysterious former colleague who may hold the key to stopping the Humanich threat. Also, Julie enlists Charlie on a mission to find out where Lucy’s orders are coming.

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Molly reveals disturbing new details about Shepherd’s death to the GSC, and Lucy makes a powerful move against the humans and hybrids that could have devastating global repercussions.

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Molly and JD frantically race to the hybrids to stop a Humanich plot that will destroy the human race. Also, Lucy has a shocking realization about the GSC that forces her to question her allegiance and put Ethan at risk.

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