S1, E1: Androids Mother and Father flee an uninhabitable Earth to settle on the planet Kepler-22b and start a family with six human embryos. Twelve years later, only one child, Campion, remains. As Mother and Father begin to malfunction, the arrival of the Ark of Heaven – a spacecraft carrying the Mithraic, a religious order of surviving humans – presents a threat that Mother has no choice but to confront.