Max is forced to confront a friend-turned-foe. Laura reels from her heartbreaking decision, but when Mattie reveals her secret, she is spurred back into action. Niska's journey takes an unexpected turn, while Leo races to be by Max's side - unaware he is walking into danger. Sci-fi drama, starring Ivanno Jeremiah, Katherine Parkinson, Lucy Carless, Colin Morgan and Emily Berrington.