The third zombie level, 'Shi No Numa' from the second DLC pack, was the first to flesh out Nazi Zombies as more than a simple easter egg. When the minigame unexpectedly became extremely popular, the developed Treyarch was prompted to make more zombie levels as DLC. They first appeared in World at War for Xbox/PS3/PC in a simple easter egg minigame intended as a joke. In the earlier Zombie maps from WaW the zombies weren't as 'zombiefied' and still resembled humans, but in the Black Ops maps they become progressively more corpselike and mutilated.

There is no way to win zombie mode, the only goal is to survive as long as possible before eventually dying, although most of the later maps in Black Ops contain complex easter egg missions with unspoken objectives.

There seems to be an infinite amount of them, and in all levels they continually increase in HP as the game goes on, eventually reaching a point where the only feasible way to kill them is with weapons that are automatically one-hit kills. Though zombies were originally featured in the Treyarch video games, they have also appeared in Call of Duty: Online, Call of Duty: Advance Warfare, Call of Duty: Infinite Warfare, and Call of Duty: WWII. The Zombies, also known as Nazi Zombies because Nazis are their most common form, are the titular main enemies of the secret game mode in Call of Duty: World at War, Call of Duty: Black Ops, Call of Duty: Black Ops II and Call of Duty: Black Ops III. They were reanimated by an extraterrestrial chemical known as 'Element 115', which came to Earth in meteors. Or perhaps, it is better to say that I have birthed him.

And a soldier who does not shy away from the shadow of death. The Führer had asked for something exceptional from my staff.

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