When an oil rig drills too deep, it unleashes a torrent of nightmares - the creatures of legend, always thought to be figments of our imagination, are now a real threat to the survival of humankind. But when he kills a seven foot tall demon with an axe to the skull, Dave Hooper - a booze-soaked, middle-aged oil rig safety manager - is transformed into a honest-to-god monster slayer.