Demons (1985)

Having received two tickets to a secret screening at the recently restored Metropol Cinema in Berlin, Cheryl invites her best friend Kathy to join her. Not knowing what to expect, the friends' evening soon takes an unexpected turn when a mysterious chrome-plated mask allows the darkest of evil into the cursed Art Nouveau building. As the plot of the violent horror film unfolds, fiction becomes reality, panic spreads like wildfire, and grotesque demonic transformations spoil the mood. Now trapped in a walled-in cinema hall, Cheryl and a handful of uninfected film enthusiasts must confront infernal monstrosities to contain the infection. But the demons are everywhere, and they want to rip them apart. With hell awaiting them, what will it take for Cheryl and the others to survive the night?