The characters include people from previous games in the Modern Warfare series such as: John 'Soap' Mactavish, Captain Price, Makarov and Macmillan. Russia continues its invasion of the United States of America and expands its attack to Europe, including the coutries England, France and Germany.
The campaign follows the events of Call of Duty: Modern Warfare 2. There are three main sections to the gameplay: campaign, special ops (the cooperative mode) and multiplayer. The game is a first-person shooter, like the other Call of Duty games.