Metal Gear Solid V's primary human antagonist is the mysterious Skull Face, and this being a Hideo Kojima game and all, it was a reasonable player expectation that they'd get to fight him in a ...

Snake returns to the battlefield in Metal Gear Solid 5: The Phantom Pain as Big Boss ... sporting what looks like shrapnel jutting out of his skull, is not, it seems, in peak form.

The Metal Gear Solid games span across decades, though not in chronological order. This should clear the timeline up.