A young woman named Cheryl receives a mysterious invitation to a free screening at a newly reopened Berlin cinema, the Metropol. Intrigued by the masked man handing out tickets, she persuades her friend Kathy to join her. At the theater, they encounter a mix of strangers, including two preppy students, a blind man and his guide, and a couple on a date. The movie they watch depicts demonic possession and violence, amplifying tension inside the dimly lit auditorium. Unknowingly, the horror on screen spills into reality when a patron who scratched her face accidentally while examining a strange silver mask in the lobby begins exhibiting violent symptoms. Her transformation into a demon kicks off chaos inside the movie theater.

The trapped audience discovers one by one that there's no way out, as the exits are suddenly sealed. Panic ensues when the infected attack others, spreading the demonic plague rapidly through the crowd. Alliances form among the survivors, each attempting to navigate the perilous situation using their wits and whatever tools they can find. As primal fear escalates into madness, every corner of the theater becomes a battleground against unrelenting evil. Suspense tightens as survivors realize they must confront their worst nightmares not only from outside forces but also those that lie within themselves. With terror engulfing each frame, an unnerving struggle for survival unfolds amidst growing dread and darkness.