Call of Duty Zombies is a popular video game mode in the Call of Duty series, where players must survive against hordes of zombies in a post-apocalyptic setting. The game features cooperative gameplay, where players work together to complete objectives, earn points, and stay alive.

In the context of online gaming, "unblocked" refers to a version of the game that can be played directly in a web browser, without restrictions or limitations imposed by schools, workplaces, or other networks. Unblocked versions often bypass traditional gaming platform requirements, such as console or PC installations.