Which Call of Duty game introduced the Zombies mode?

Call of Duty: World at War introduced the Zombies mode to the franchise. Treyarch’s 2008 World War II shooter included the mode as a surprise feature after players completed the final campaign mission.

The first Zombies map was called “Nacht der Untoten,” or “Night of the Undead.” In this survival mode, one to four players fought increasingly difficult waves of Nazi zombies, repaired barricades, earned points, and unlocked new rooms and weapons.

Zombies was not initially the headline feature of World at War. Its unexpected popularity encouraged Treyarch to expand the concept through downloadable maps, including “Shi No Numa” and “Der Riese.” Those maps introduced ideas such as Perk-a-Cola machines and the Pack-a-Punch weapon-upgrade machine.

Black Ops later developed the mode into a major narrative and gameplay pillar. Black Ops 2 continued that tradition, but it did not introduce Zombies. Advanced Warfare also included its own later version, while Modern Warfare is associated with other modes.