Snake was called back to the US military in 2005 when he was deployed by his former commander Roy Campbell to Shadow Moses Island. Here, a rebellion had taken place by the members of FOXHOUND, his former unit, who were threatening the USA with a nuclear missile. The Task fell on Snake, a former operative and expert, to stop them.
In charge of the renegade group was Liquid Snake. His demand, the remains of Big Boss. Solid Snake was charged with ascertaining their nuclear capability and rescuing their hostages, Kenneth Baker and Donald Anderson.
Snake infiltrated the base alone, but quickly gained help in the form of Metal Gear REX developer Hal Emmerich and new FOXHOUND recruit Meryl Silverburgh, the latter of whom was actually Campbell's daughter, although Snake did not know this at the time. Metal Gear REX was a nuclear-armed bipedal walking tank developed in secret by the US Army and weapons manufacturer ArmsTech (later AT Corp). With the help of the two aforementioned, as well as his former comrade Gray Fox (now the Cyborg Ninja, Snake succeeded in destroying REX and defeating the members of FOXHOUND, including (supposedly) Liquid.
