A third Snake brother known as Solidus Snake is introduced as the United States President at the end of "Metal Gear Solid" and serves as the main antagonist of "". During his time as president, Solidus became aware of a secretive cabal known as "The Patriots" who were steadily manipulating the course of history. After his tenure as president is over, Solidus takes control of the "Big Shell" offshore facility, which is being used to develop Arsenal Gear, a mobile undersea fortress designed to house and protect a network of AIs created to influence human development by filtering the availability of information across the Internet. The game is set four years after Liquid's death in "Metal Gear Solid", and it puts the player in control of Raiden, a soldier who fights against Solidus, who is revealed to be his former commander during his time as a child soldier. Raiden joins forces with Snake and learns that they are being manipulated by Revolver Ocelot, who has been working for the Patriots. At the end of the game, Ocelot seemingly becomes possessed by Liquid Snake as the nanomachines from Liquid's arm (which Ocelot took to replace his own arm after Gray Fox slices it off in "Metal Gear Solid") work their way into Ocelot's thought process.