First appearance: Prince of Darkness (1987)
In the bowels of a small run down church a secret is hidden. A group of physics students spend the weekend trying to discover what that secret is. Turns out its a big can of liquid Satan and Jesus was an alien. Can the students stop the awakening evil from bringing Anti-god across the dimensional plane and destroying the universe?
The second movie in John Carpenter's Apocalypse Trilogy (the other two are The Thing and In the Mouth of Madness)