Call of Duty: World at War – Zombies (also known as simply Call of Duty: Zombies) was a first-person shooter video game. It was a spin-off of the Call of Duty series, and based on the Zombies mode of Call of Duty: World at War. The game's setting originally takes place in a German bunker (Nacht der Untoten, meaning "Night of the Undead" in German) during World War II from the viewpoint of a US Marine. SS soldiers who have become zombies attempt to infiltrate the bunker and attack the players, and the players must defend themselves in the process.