World at War (2008)\n\n The fifth Call of Duty installment, World at War, was the official introduction to the famous Zombies mode. This is where Nazi zombies originally came from. World at War's Zombies were not campy, and just genuinely terrifying.

there is no zombie mode in the modern warfare series. there is a multiplayer mode called infected but thats it. besides Advanced Warfare, and WWII, the black ops franchise is the only call of duty with a zombies mode that has been in it throughout the entire franchise.