Gunned down in the snowy wilderness and desperate for shelter, Billy Cavanagh is taken in by kooky old lady Agnes, unaware that her isolated log cabin is surrounded by bloodthirsty skinless creatures hellbent on getting inside.

On the same day that Tom Dunn finds out that he is to become a father again, the people of Earth become plagued with terrifying visions of the end of the world. When a gigantic, all-consuming alien mothership launches a ruthless attack, chaos and destruction follow. The ultimate war for Planet Earth is about to begin...