David, a teenager, heads to the Montana Mountains to visit his alien father, Cal. She is going to accompany him on a hunt trip. David is not very excited about having to leave behind for a few days, but he does not have a choice. While David would like to stay in the cottage to play video games, Cal finally manages to persuade him to accompany him to the heart of the mountains. But soon, the two, father and vet will lead a terrible struggle for survival.