Call of Duty: Zombie Operations

Call of Duty: Zombie Operations, abbreviated as CoD: ZO, ZO, or simply Zombie Ops, is the tenth main Call of Duty game, and the only game in the series focusing around the popular Zombies gamemode. The game was published by Activision and for PC, Xbox 360, PlayStation 3, and the Wii U.

Plot
Following the end of Richtofen's Grand Scheme, four groups of survivors on Earth fight the impending zombie hoards who have taken over the Earth.

In the Prologue to the game, three CIA agents, who are on a mission to stop an attack on the US, gets caught up in the zombie apocalypse, and Samantha's wrath. This map also describes the creation of the Crawler Zombie: monkeys who were killed and zombified and came in contact with the Nova Gas.

Downloadable Content
Certain downloadable content was released for the game on the game's release. All of the classic Zombies maps from World at War and Black Ops, are available for downloadable content. It was confirmed that none of these will be released for any system aside from the Xbox 360.