Ocelot is a GRU Major who leads a special unit within Spetsnaz known as the "Ocelot Unit". He first encounters Snake during the Virtuous Mission, where he is subdued in front of his subordinates.
During Operation Snake Eater, Ocelot worked as a triple agent. He was at first an agent of The Philosophers, sent to Russia to infiltrate Colonel Volgin's army and steal The Philosophers’ Legacy for America. He was then asked by the DCI to aid Naked Snake in his mission to destroy The Cobras, destroy the Shagohod, and kill The Boss, while also trying to get the Philosophers' Legacy for the American branch of The Philosophers. However, before Ocelot turned up to meet Snake, a Chinese spy posing as EVA pretended to aid Snake in his mission while secretly plotting to take the Philosopher's Legacy for the Chinese government.
Ocelot decided to keep his identity as ADAM a secret and aid Snake subtly and secretly. Throughout the mission, Ocelot and Snake have a mutual rivalry and fight on several occasions. During the fight between Snake and Volgin, Volgin orders Ocelot to shoot Snake. However, Ocelot refuses, not only hinting at his triple-crossing before it is fully revealed, but also alluding to the fact that Ocelot looks up to Naked Snake. At the end of the game, a secret conversation between Ocelot and the DCI reveals that the American branch of the Philosophers have only acquired half of the Legacy, and that the KGB has the other half. By 1970, Ocelot manages to obtain the other half of the Legacy, waiting until the time is right to use it.
