In this episode, the narrative moves rapidly across two primary locations:
Bill Ward (Gabriel Byrne) continues his work on a biological weapon—a virus meant to target the aliens.
A new survivor, Zoe, encourages a hesitant Bill to use Emily as a test subject for his virus, arguing that the survival of humanity outweighs individual morality. Key Episode Details Information Air Date May 17, 2021 (Europe); June 13, 2021 (US) Director Gilles Coulier Writer Howard Overman Notable Cast
The attack results in the deaths of Colonel Mokrani (Adel Bencherif), the group's heroic leader, and Theo , a young boy. Jokim also murders his own brother, Micah, to prevent further collaboration with humans. London Survivors' Encampment:
The facility is attacked by "hard-line" invaders, Adina and Jokim, who are hunting Micah for his betrayal.
A wounded dissident alien named Micah (Robert Emms) arrives at the observatory. He reveals to Catherine Durand that his people have developed the technology for space and time travel , and that he specifically needs to find Bill Ward .
Critics noted that this episode significantly increased the series' pace, abandoning the "meditative" speed of Season 1 in favor of relentless action and major character deaths.
Bill observes unsettling physical and neurological similarities between the aliens and Emily Gresham .