In a dark and desolate church in Los Angeles, a group of scientists and university students come together to investigate a mysterious cylinder discovered by an elderly priest. Inside the container, they find a strange green liquid that seems to possess supernatural properties. They soon realize that this liquid is nothing less than the manifestation of absolute evil, an entity that has been contained for centuries, waiting for the opportune moment to break free.
As the team begins to study the cylinder, inexplicable phenomena start occurring around them: terrifying visions, possessions, and a series of strange deaths affecting those who come near the object. The scientists, led by the charismatic yet skeptical Professor Brian, try to unravel the mystery, but their understanding of what they are dealing with falters in the face of the growing madness surrounding them. With nightfall and the power of evil increasing, they must confront not only the dark entity, but also the deepest fears of each of them.
Time is running out, and the narrative becomes increasingly chilling, forcing the protagonists to confront their own humanity as they struggle to prevent the impending arrival of a demonic apocalypse. In this desperate fight for survival, they will learn that sometimes, the worst enemy may be within oneself.