Lucy makes a move that could have global repercussions; J.D. and Molly race to thwart a plot that could destroy the human race; Ethan is put in jeopardy.

Molly and JD frantically race to the hybrids to stop a Humanich plot that will destroy the human race.

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.

Molly has a vision she can't shake following a near-death experience. Also: Shepherd's loyalty to the Global Space Commission is questioned.

Memories resurface as Molly succumbs to the virus; Julie is confronted with hard choices; and the Hybrids seek revenge.

After a Global Security Commission raid on the hybrid compound, Molly desperately tries to save her son Adhu, while JD attempts to rescue his daughter who is being held captive by Shepherd. Meanwhile, Lucy becomes more of a threat to humans.

Molly and JD hope for peace and try to get Shepherd to broker a deal between humans and hybrids, while Lucy tries to manipulate Charlie's feelings to put him in a compromising position.

Molly starts changing physically, but isn't sure of the result or if she can reverse it, which sends her into a panic. Also, JD's ex-wife reappears to discuss their daughter. Later, Molly and JD hope for peace and try to get Shepherd to broker a deal between humans and hybrids, while Lucy tries to manipulate Charlie's feelings to put him in a compromising position.

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.

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.

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

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

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.