Since the incident on Shadow Moses Island, Metal Gear's top-secret technology has been leaked into the black market through the machinations of Revolver Ocelot. As a result, countless variations of Metal Gears have sprung up in every corner of the globe, making the weapon an increasingly common component of the armed forces of nuclear powers. In the midst of all of this, Solid Snake, now a member of the anti-Metal Gear group "Philanthropy," has learned that a new prototype Metal Gear has been...