Everyone thought of it as a harmless lightning storm. When Dave Drayton notices a strange mist on the lake, he thinks nothing of it. When his son, Billy Drayton, his neighbor Brent Norton, and himself travel to the supermarket, the unthinkable happens. On their way to the market, they see the army, the firefighters, and the police, heading toward the mist. When he sees this Brent mentions something about "Project Arrowhead", a secret military plan that no one knows about. As they are shopping, they see three army men walk in, just to pick up a few things then head toward the mist. All eighty of the store's shoppers had no clue what was going on until an old man runs in the market with a bloody nose and declares "Something in the mist!" He tells them to close the door. About five seconds after they do close the door, the entire store shakes, as though it was lifted feet above the ground. When David is asked to check on the generator...