You are Ivan Freeman working another boring day at the gun factory some location at the middle of nowhere in Texas. Night closes in on you strong and lacking life, for you find you and your co-workers trapped in the factory while Hell claims Earth. Aliens from a strange world known as "Xen" come to warn you, but are far too late. Demons find and their way in like spiders.
He walks around, laughs in your face, and beats the life out of you.