Metal Gear and Metal Gear 2: Solid Snake center around the rivalry between protagonist Solid Snake and his commanding officer-turned-nemesis Big Boss. This rivalry served as the basis of the Les Enfants Terribles storyline introduced in Metal Gear Solid, where Solid Snake is revealed to be a clone/son of Big Boss, along with his two brothers: Liquid Snake and Solidus Snake. In Metal Gear Solid 2, Raiden is initially introduced with the codename "Snake" before being given the codename "Raiden". In Metal Gear Solid 3, it is revealed that Big Boss's former codename was "Naked Snake".