Acauly, it was released on the NES and SNES as Metal Gear and Metal Gear two, Then Metal Gear Solid and then Metal Gear Solid 2: Sons of Liberty.
I think there was like three or four games for the NES, but one of them is not officialy a part of the series because it was made without the creators involvment and the story made snake out to be some weird navy seal mercanary wack-job, while the other made him out to be the perfect soilder, no remorse for who he kills, just faces on the battlefield.
basicly, A guy forms a nation in Africa called Outer Heaven, And they have captured a scientist and used his genious to build a huge walking nuclear battle tanks capable of firing a nuke from anywhere on earth. FOX HOUND sends Gray Fox into Outer Heaven to bring it down, but he goes missing, So they send in Snake, a rookie FOX HOUND member, The leader of outer heaven turned out to be Big Boss,the leader of FOX HOUND, who engineered the whoel thing with the intention fo snake coming into the battle, but he expected Snake to fail, he did not. Snake found the scientist and use his info to destroy Metal Gear. Big Boss escaped and Gray fox was taken away, but regarless, Outer Heaven was taken down.
Metal Gear two starts off with big boss building a new place called Zanzibar Nation, and it turns out that Metal Gear was NOT destroyed and moved to this new location. Recently retired Snake is called to active duty by Col. Campbell and he again works to take down this armed milita. During the mission he discovers that Big Boss survived and is trying to breed a world of continued war where soilder like him acauly serve a purpose, a world full of war and conflict, during the final battles Snake is pitted against his old friend and presumed dead collegue, Gray Fox. Snake battles Fox and reluctantly kills him, destroyed metal gear for once and all and most important, Kills big boss and puts an end to his plans.
In Metal gear Solid, Snake is once again recalled to active duty to infiltrate a nuclear waste disposal site to A) rescue two hostages and B)find out if the terrorist are capable of firing a nuke. During the mission snake leans alot about outer heavan and his own origins, but I won't spoil the plot as it's a damn good game, but regardless, there is a new Metal Gear there, Metal Gear Rex, you wind up destroying it as well.
MEtal Gear Solid 2: Sons of Libery is really weird plot, but snake is now a member of an anti-metal gear program as the result of MGS had someone leaking the plans for Rex on the black market, this is spuring Any country with nuclear weapons program their own versions of Metal Gear, Snake and otacon (who he met int he previous game) go around gathering intel on the Metal Gears and destroying them is they can and need be.
The find out the Marines are making a Metal gear that can swim andwhere and make beach landings, it was suppose to be an anti metal gear metal gear and be able to be mass produced, snake is on a mission on the tanker to find on intel on it and is caught in a russian mercanay group takes of the tanker, the tanker is sunk by a group called the patriots and framed for it, so they engineer an elaborate cover up and say snake was killed when the tanker when down, now five years later, the oil spill was covered by a treatment plant as it's in the lower manhattan harbour, this plant is attacked and the president is taken hostage wheile on an inspection tour.
Raiden, A new meber of the newly re-formed FOX HOUND is sent into the plant to resuce the plant and uncover the conspiracy regarding the leader who goes by the name Solid Snake.
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