The world was fine till it had lost is all ,humans had no slight clue that the government lost control of there plan.For years now killing one by one the experiments that went crashing down in failure.For a while now they thought they had killed them all but the thing is the experiments where breeding making more,its your job to kill the governments agents that are coming to kill you,there are other experiments that aren't here for the better,they where made to either find other experiments and kill them or they just like to kill.Either you live or die,you cant blow your cover just yet.
Thats the base of the story