Main
Amanda Collin as Mother/Lamia, a powerful war android known as a 'Necromancer', reprogrammed to raise human children on Kepler-22b to establish an atheist colony.
Abubakar Salim as Father, a generic service model android reprogrammed to protect and support the colony's children.
Winta McGrath as Campion, the youngest and only survivor of six children born from embryos brought to Kepler-22b by Mother and Father. Munro Lennon-Ritchie portrays Campion at eight years old.
Travis Fimmel as Marcus/Caleb, an atheist soldier and Mary's partner. Jack Hawkins portrays Caleb with his true face.
Niamh Algar as Sue/Mary, an atheist soldier/medic and Caleb's partner. On Earth, she (Mary) and Caleb had killed a Mithraic couple, Sue and Marcus. Mary and Caleb altered their appearances to resemble the couple to get onto the Ark. Sienna Guillory portrays Mary with her true face.
Jordan Loughran as Tempest, a surviving Ark child who despises the Mithraic due to having been raped by a religious leader.
Felix Jamieson as Paul, the biological son of Marcus and Sue, raised by Caleb and Mary as their own child.
Ethan Hazzard as Hunter, one of the surviving Ark young adults.
Aasiya Shah as Holly, one of the surviving Ark children.
Ivy Wong as Vita, one of the surviving Ark children.
Matias Varela as Lucius, a loyal Mithraic soldier and survivor of the Ark crash.
Peter Christoffersen as Cleaver (season 2)
Selina Jones as Grandmother (season 2)
Morgan Santo as Vrille (season 2)
James Harkness as Tamerlane (season 2)
Kim Engelbrecht as Decima (season 2)
Jennifer Saayeng as Nerva (season 2)
