Humanity faces extinction in this gripping sci-fi thriller as a series of devastating alien attacks, known as the Waves, systematically dismantle civilization. Teenager Cassie Sullivan, portrayed by Chloe Grace Moretz, fights to survive the chaos after being separated from her younger brother. As trust becomes humanity's rarest commodity, Cassie navigates a treacherous landscape where the enemy can look just like a friend, forging an uneasy alliance with the mysterious Evan Walker, played by Alex Roe. Meanwhile, her brother Sammy finds himself in a military camp led by the enigmatic Colonel Vos (Liev Schreiber), where children are being trained as the last line of defense. Directed by J Blakeson, the film builds a tense atmosphere of paranoia and survival, challenging its young heroes to discern friend from foe in a world where the ultimate invasion has already begun.