When crop circles begin mysteriously appearing in the fields of Bucks County, Pennsylvania, widower and ex-minister Graham Hess (Mel Gibson) reassures his two young children that everything is going to be OK. But sightings of an alien figure around the Hess farm, along with news that crop circles are appearing all over the world, soon has everyone anticipating the worse. All the signs point towards an extra-terrestrial visitation, but will it be a friendly encounter or a hostile invasion?