Call of Duty Zombies works best when fans have some time to miss it, returning every few years alongside each Treyarch game. Having a Zombies mode for every Call of Duty game can not only put too much pressure on the developers, like with Vanguard, but it also leads to an over-saturation of Zombies content.

It first appeared in Call of Duty: World at War and became highly popular upon the game's release, resulting in the mode returning in Call of Duty: Black Ops, Call of Duty: Black Ops II, Call of Duty: Black Ops III, Call of Duty: Black Ops 4, Call of Duty: Black Ops Cold War, Call of Duty: Vanguard, and Call of Duty: ...