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Zombies can be gibbed, but will continue to attack the player even after having lost half of their limbs. Zombies will only attack a player through melee attacks they do not use weapons. Zombies are deceased humans reanimated by Element 115 and are the primary enemies of the game mode of the same name. Perk-a-Colas are a feature that can be found in all Zombies maps, except for Dead Ops Arcade, and the Call of Duty: World at War version of Nacht der Untoten. Each drink gives the player a perk to help them survive and fend off the zombie hordes. Some are based off of perks found in multiplayer (such as Juggernog and Speed Cola mirroring Juggernaut and Sleight of Hand respectively). Points are spent on a variety of things, including buying new weapons, Perk-a-Colas and opening doors or clearing debris. Points are on all of the maps and are awarded for shooting/killing Zombies, boarding up windows, reviving a downed teammate and successfully hacking some things. There are a total of 35 (seven sub-maps) maps in the Zombies game mode, which are Nacht Der Untoten, Verrückt, Shi No Numa, Der Riese, Tutorial (ZOMBIES), Kino Der Toten, "Five", Dead Ops Arcade, Ascension, Call of the Dead, Shangri-La, Moon, four revamped World at War maps, Tutorial (Black Ops Zombies), House, Overlook, Temple, Facility, Nevada (featuring Nuketown Zombies), Green Run (featuring TranZit, Town, Farm, Bus Depot, and Diner), Great Leap Forward (featuring Die Rise), Alcatraz Island (featuring Mob of the Dead and Cell Block), Resolution 1295 (featuring Buried and Borough), Excavation Site 34 (featuring Origins), Shadows of Evil, The Giant, Dead Ops Arcade 2: Cyber's Avenging, Der Eisendrache, Zetsubou No Shima, Gorod Krovi, and Revelations. In Black Ops II, Grief mode features up to eight players online when played. Zombies become stronger and faster upon completion of each round, forcing players to make tactical decisions about point spending and progressing through the map. This can be played alone, splitscreen (two players maximum on World at War and Black Ops (except Dead Ops Arcade), up to four on Black Ops II and Black Ops III), LAN party, or online. In Zombies, players face endless waves of zombies, buy and use weapons, perks, and utilities, use power-ups to support them and repair nearby defenses to keep zombies out.

Other variant gamemodes were made by Treyarch, Sledgehammer and Infinity Ward which base off of Zombies, called Dead Rising ( Call of Duty: Online), Exo Zombies ( Call of Duty: Advanced Warfare), and Infinite Warfare Zombies. More installments of Zombies mode were made into Call of Duty: ZOMBIES, Call of Duty: Black Ops Zombies, and Call of Duty: Black Ops DS.

Zombies, originally known as Nazi Zombies, is a tertiary gamemode developed by Treyarch, Ideaworks, and N-Space and was first introduced in Call of Duty: World at War (with the exception of the Wii, which was cut due to data limitations), later returning due to its popularity in Call of Duty: Black Ops (being introduced to the Wii), Call of Duty: Black Ops II (being introduced to the Wii U), and Call of Duty: Black Ops III.
