When an oil rig off the Gulf of Mexico digs too deep, a torrent of nightmares is unleashed - the creatures of legend, always thought to be figments of our imagination, are now a very real threat to the survival of humankind. Safety worker Dave Hooper has the hangover from hell, and the last thing he needs is an explosion on his oil rig. But this is no accident, and despite the news reports, terrorists aren't to blame for the carnage. The rig is swarming with monsters. As he fights to save his co-workers from the ravenous demon horde while holding down last night's tequila, Dave is suddenly transformed from a foul-mouthed, overweight, booze-soaked slacker into something else entirely. An honest-to-goddamn monster slayer.