When Dave Drayton notices a stange mist on the lake, he does not think much of it. When his son, Billy, his neighbor Brent Norton, and himself travel to the grocery store, strange things begin to happen. On their way to the market, they see the army, the local firefighters and police, heading toward the mist. When he sees this, Brent mentions something about "Project Arrowhead," a secret military plan that no one knows about. All of the store's shoppers...