He is an ex-Fox-Hound operator. He has an IQ of 180 and speaks 6 lanquages fluently. He is also known as "The Legendary Mercenary", "A man who changes impossible into possible", since his outstanding activities in "Outer Heaven" and "Uprising of Zanzibar". Colonal Campbell called Snake back from his solitary life in Alaska which he has been living since he left Fox-Hound, to ask him to infiltrate Shadow Moses island.