A terrorist operation, involving Revolver Ocelot and a man under the codename "White Mamba", is taking place in an island of the coast of Costa Rica.They have a weapon simply titled "Metal Gear", that has the power to destroy the world. Legendary soldier, Big Boss, sends his subordinate, Solid Snake to investigate the cause and neutralize it. However, Snake notices something is off. Once he digs into this deeper, he discovers a conspiracy involving Big Boss that will change the world as we know it.