A bank teller discovers he is actually a background player in an open-world video game, and decides to become the hero of his own story. Now, in a world where there are no limits, he is determined to be the guy who saves his world his way before it's too late.

Hundreds of gremlin-like mutant creatures from a melting glacier violently descend on a survivalist cabin in the mountains where an unsuspecting circle of high school seniors are celebrating their last weekend together before college.