In 2014, the world is in chaos, the "war economy" plunging the world into never-ending battle. This fuels the need for private military companies, the five largest of which (together rivaling the power of the entire United States Army) are owned by a single mother company, Outer Heaven, with Liquid Ocelot at the helm. Liquid Ocelot, a fusion of the consciousness of Liquid Snake and the body of Revolver Ocelot, is once again set on world domination and Solid Snake, now suffering advanced accelerated aging and under the codename of "Old Snake", is dispatched as a personal favor to Roy Campbell to assassinate him.