The Sundance Kid is the frontier's fastest gun. His partner, Butch Cassidy is always dreaming up new ways to get rich fast. If only they could blow open a baggage car without also blowing up the money-filled safe inside. So Butch and Sundance pack their guns, put on new duds, and, with Sundance's girlfriend, head down to Bolivia.

An alien bacterium that transforms steel objects into furious killing machines has crash landed in Idaho and infected the local scrap yard. Can a local contractor and his estranged ex-girlfriend find a way to stop a heavy metal monster from tearing a path of biological and mechanical destruction through small-town America?