Due to a legal dispute between the game’s publisher Activision and the former co-executives of Infinity Ward – which caused several lay-offs and departures within the company – Sledgehammer Games assisted in the development of the game, while Raven Software was brought in to make cosmetic changes to the menus of the game. The game was said to have been in development since only two weeks after the release of Call of Duty: Modern Warfare 2.
The game continues the story from the point at which it ended in the Call of Duty: Modern Warfare 2 and continues the fictional battle story between the United States and Russia, which evolves into the Third World War between NATO allied nations and ultra-nationalist Russia.
