- Previous episode S01E03 - Episode 3
- Number S01E04
- Writer Howard Overman
The survivors make some disarming discoveries not only about the aliens but also about themselves. Mokrani goes on the offensive, taking the fight to the aliens. Ash is forced to make the hardest decision of his life. Chloe's past catches up with her, threatening to rip apart the delicate semblance of normality she is so desperately clinging on to.