A zombie is a reanimated corpse that has a taste for brains. They are supposed to be scary, but they are not. This is especially the case in the Call of Duty games, where they run like a drunk who had just came out of a pub. Also in this game is the hellhound, which spawns from lightning; then chases you around the maps. It eventually gets stuck somewhere on the map, so you can walk up to it, and even shoot its head without it so much as moving. Also of note are the Crawler zombies, which when killed release a poisonous gas (from their backside?) which can harm you. In all, zombies are not scary, but quite the opposite.