Activision Blizzard's top-selling first-person shooter franchise marches on with Call of Duty- Modern Warfare 3. Players must deal with the fallout from the devastating attacks on U.S. and British soil in a storyline that picks up where 2009's Modern Warfare 2 left off. The single-player campaign has you battling Russian ultranationalists, led by Vladimir Markov, as members of the U.S. Delta Force and British SAS. You'll battle across war-torn areas of New York City, London, Paris, Mogadishu, Dubai, and other regions as you prepare to end the global threat once and for all. As with previous entries in the Call of Duty series, Modern Warfare 3's campaign features a heavily scripted, cinematic experience with Hollywood-style special effects. One new mission, for example, has you involved in underwater travel with a sonar-equipped submersible watercraft. You'll then fight inside an enemy-controlled submarine before guiding an inflatable raft across turbulent waters while a naval battle .