After Earth is rendered uninhabitable, Androids start a settlement and a new family with human embryos on the planet Kepler-22b.

Mother receives unexpected guests with sinister plans. Are humans and androids the only inhabitants of Kepler-22b?

Marcus moves forward with a plan to rescue the Mithraic children, but first he has to find them. Back at the settlement, Campion and Paul bond while on a hunting expedition with Father, and Mother attempts to learn more about her origins.

After rekindling her connection to her creator, Mother finds herself distracted by intense feelings she didn't know she was capable of having, unaware that Marcus, Sue and the Mithraic are closing in on the settlement.

As Marcus continues to embrace his Mithraic devotion, Sue worries he may no longer have her and Paul's best interests at heart. Mother experiences what she believes to be malfunctions, and Hunter works on a secret project with Father.

Sue is determined to keep the children safe, and in doing so, struggles with whether or not she can trust Mother. Meanwhile, a new threat arises and an increasingly erratic Marcus causes the Mithraic to question their leader.

Paul displays troubling behavior that leads to a revelation; Sue confides in Mother, while Father battles human-like emotions; as Campion questions his place in his new family, Mother and Father uncover a secret about the native creatures.