As Marcus (Travis Fimmel) continues to embrace his Mithraic devotion, Sue (Niamh Algar) worries he may no longer have her and Paul's (Felix Jamieson) best interests at heart. Meanwhile, Mother (Amanda Collin) experiences what she believes to be malfunctions, and Hunter (Ethan Hazzard) works on a secret project with Father (Abubakar Salim).