Locked away in a secret facility for their own protection, a group of young mutants must confront their traumatic pasts and dangerous powers in this tense horror-thriller. Blu Hunt stars as Dani Moonstar, a newcomer who arrives at the isolated hospital run by the enigmatic Dr. Cecilia Reyes, played by Alice Braga. She discovers other troubled youths like the volatile Rahne Sinclair (Maisie Williams), the aristocratic Illyana Rasputin (Anya Taylor-Joy), the sun-charged Roberto da Costa (Henry Zaga), and the haunted Sam Guthrie (Charlie Heaton). As they struggle to master their abilities under the watchful eye of their caretaker, terrifying manifestations of their deepest fears begin to stalk the corridors. Directed by Josh Boone, the film blends superhero action with chilling psychological horror, forcing each character to battle the monsters within before a mysterious external threat can consume them all. Their fight for survival becomes a harrowing journey of self-discovery, where the line between reality and nightmare blurs.