The horror genre has become somewhat stale, as nearly all the possible tropes have been explored. Unborn twin going on a killing spree? Check. A battle between angels and humanity caught in the crossfire? Check. Satanic killer nuns? Check. But every now and then, we're reminded of some oldies-but-goldies that truly helped define the horror genre and its numerous sub-genres, like the original Exorcist or The Visitor.

The latter, also known as Stridulum, is a 1979 sci-fi horror movie that stands out as a rather unique entry in the genre. The movie opens in an otherworldly setting where Jerzy Colsowicz experiences a vision of a young girl with immense powers who's also part of a cosmic conflict between Zatteen, an evil force with psychic abilities, and Yahweh, his benevolent counterpart.