The mainland is lost, conquered by the armies of walking dead that now roam the earth, consuming all in their path as they spread like a black plague through the wasteland that had once been civilisation. As the remains of the human race retreat to the islands, clinging to them like life rafts in an ocean of terror, the ravenous monsters, the evil shadows of humanity, become the dominant species on the planet. Disease, famine, and death begin to spread through the cramped refugee camps, threatening the continued existence of the living and forcing the remnants of the government and armed forces to begin an offensive that would recapture the ground that they have lost to the infected hordes. The survivors of the team, finding themselves placed at the spearhead of the great counterstrike, are given a special mission that would help tip the scales against their rotting enemy. Now they must fight for the entire world.