What Call of Duty game was the first one in the series to features the zombie mode?

Call of Duty: World at War was released in 2008 and returned the setting to World War II. Additionally, this is the first entry in the Black Ops storyline, and was the first game in the series to have the zombie mode, which was expanded upon in subsequent sequels.

Asked by Vasilii Kulev · Last updated 4 years ago · 55 views · SOURCE