Here is my idea...
In the future, some countries during Wartime creates supersoliders.
Soldiers genetically altered to be freaks of humans, super strong, super reflexs, and with there weapons built in, dependent on their structure. (IE: The big one gets a helicopter mini-turret in their stomach)
They were obedient and listen to there orders and etc etc.
They won the war, thats great, but, they all get sent to a nuclear bunk.
Why? So the outside world wouldn't be hurt by them.
Then it the worse came.
They became self-aware.
Why should the strong be forced to serve?
They rebelled. All of them, but one.
The one Retarded supersoldier did not realize that.
When they searched the bunker after the uprising, they find him.
And you play as that retard. Set to stop the Uprising from conquering the world.