The roughneck skeleton crew of an off-shore oil rig battles a mysterious beast that's killing them off one at a time as a massive tropical storm makes any hope for escape impossible. When the folks at headquarters notice a big storm blowing in, they evacuate the main crew of the "Charlie" rig, leaving only a few highly skilled workers behind to ensure that production continues uninterrupted. Later, as the storm rolls in, one of the crew members vanishes without a trace. And he's just the first; over the next few hours, the remaining workers realize that something horrible is hunting them from the dark. It's killing for sport, and their only hope for surviving until the rescue crew can make it through the storm is to band together, and fight back with everything they've got.