Stars: Gabriel Byrne, Léa Drucker, Natasha Little, Daisy Edgar-Jones, Ty Tennant
Series Plot: When astronomers detect a transmission from another galaxy, it is definitive proof of intelligent extra-terrestrial life. The world's population waits for further contact with bated breath. They do not have to wait long. Within days, mankind is all but wiped out by a devastating attack pockets of humanity are left in an eerily deserted world. As aliens hunt and kill those left alive, the survivors ask a burning question - who are these attackers and why are they hell-bent on our destruction?
Episode plot: At the Observatory, Mokrani and Catherine clash over the fate to be reserved for Micah, whom Catherine considers to be a major source of information. Micah reveals to Catherine that she has to find Bill Ward. The latter, for his part, tries to find out more about Emily, still assailed by visions of Adina, the leader of the aliens urging him to kill Bill.