A family in emotional turmoil is taken by surprise in this quirky adventure where an eccentric 8-year-old American boy, Wes, has an existential epiphany - He believes that he is in fact a Mongolian goat herder.

When a meteor crashes on Earth, a group of people seek shelter in a bunker. Ten years later, they need supplies and leave the bunker, discovering that the survivors have turned into mutants.