Astronaut Molly Woods tries to reconnect with her husband, John, and son, Ethan, after returning from a 13-month solo mission in outer space. Molly’s mystifying experiences in space lead to events that will ultimately change the course of human history.

After Molly collapses and experiences a vision of her encounter on the Seraphim, Sam agrees to give her an ultrasound so she can learn more about her mysterious pregnancy. Also, Molly tracks down Kryger and he reveals the disturbing details of his own solo mission that the International Space Exploration Agency (ISEA) is keeping secret.

Molly has to decide if she is going to reveal her pregnancy to John after he confronts her about her distant behavior. Meanwhile, John and Molly face parents who are suspicious of Ethan when he goes to school for the first time.

After Sparks attempts to quarantine Molly, she and her family seek refuge on a remote island with her estranged father, Quinn. When the agency closes in on their whereabouts, Ethan is exposed to grave danger. Meanwhile, Yasumoto experiments with a strange and deadly substance.

John begins to doubt Molly's mental state when the validity of her pregnancy is questioned. Meanwhile, Ethan suffers a serious setback, and John and Julie disagree over how to care for him.

When Sparks falls under the influence of the vision of his deceased daughter, he flees with Molly’s baby to a remote location. Now, Yasumoto and Molly must rely on each other to track down the offspring.

John makes a discovery about Yasumoto as Molly gets closer to locating her offspring; Sparks' visions of his daughter persist.

When Molly finally comes face-to-face with her offspring, she realizes she may be the only one who can stop the coming danger. Meanwhile, Julie uncovers grave secrets about Odin.

Molly returns to space in an attempt redirect the Seraphim away from Earth and protect the world’s population from the deadly spores. Also, John discovers that Odin's plan has put Ethan in terrible danger.