What is probably the most confusing and defended series ever conceived started off as a mostly unknown NES title. Before the time of PlayStation and 3D graphics, Snake was doing what he does best - sneaking past 8 bit soldiers and guard dogs in Metal Gear.
If it was any other franchise, it would have probably fallen by the way side after its sequel, but when CD based gaming became the way to go, Metal Gear Solid came along and created a legacy that would forever cement cardboard boxes as the top echelon of stealth based technology.
Oh yeah and it gave us nanomachines. Lots and lots of gabbing about nanomachines.
Image source: Kotaku