Aliens are special type of enemies in some custom Nazi Zombies maps. It appears as a large Alien with the size of the a Human. They are bosses, so they appear in some rounds. They either wield a Ray Gun or a Shrink Ray. If an Alien has a Ray Gun the player will be downed in 2 hits without Juggernog and with Juggernog the player can resist up to 4 hits. Aliens can sometimes use a Shrink Ray, it will shrink the player, but the player will get back to his normal size after 30 seconds.