"Metal Gear Solid" elaborates on the storyline of the earlier games and reveals that Solid Snake is a genetic clone of Big Boss, created as part of a secret government project. An antagonist is introduced in the form of Liquid Snake, Snake's twin brother who takes control of FOXHOUND after Snake's retirement. Liquid and FOXHOUND take control of a nuclear weapons disposal facility in Alaska and commandeer REX, the next-generation Metal Gear weapons platform being tested there. They threaten to detonate REX's warhead unless the government turns over the remains of Big Boss. Solid Snake destroys Metal Gear REX and kills the renegade FOXHOUND members, with the exception of Revolver Ocelot.