Despite their similarities, however, Warzone 2 and MW2 are two entirely separate games. With that being said, can you play Warzone 2 without buying MW2? Yes, you can.

The eleventh major installment in the Call of Duty series, the game was developed by Sledgehammer Games for PlayStation 4, Windows and Xbox One, while High Moon Studios developed the versions released on PlayStation 3 and Xbox 360, and Raven Software developed the game's multiplayer and the Exo-Zombies mode.

In Exo Survival, Gideon appears in the cutscene on the map Riot when zombies appear, picking up the player and asking them are they alright. After doing so, Gideon looks out at the prison to see it swarming with zombies, and is pulled out of the helicopter by one of them.