You've probably heard that the Old West was a dangerous place, that the rugged terrain and lawlessness was an incredibly tough environment in which to carve out a peaceful living. But history books and spaghetti Westerns never told you the real threat that dominated that period of American history. No it wasn't contagious diseases, or bears, or bears with contagious diseases. It was zombies. The Old West was absolutely riddled with the undead.