In a nutshell.
[spoiler]In the past there was this super awesome soldier called Naked Snake. Who later went evil and became Big Boss. The government saw how awesome he was and created 3 clones: Solid Snake, Liquid Snake and Solidus Snake. Liquid Snake was pissed at getting the recessive genes, Solid Snake trained huskies in Alaska and Solidus Snake became President.[/spoiler]
English
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President? what
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Yeah it's a long ass complicated story. There's lots of videos explaining the story and they do it well, you should check them out.