The Perses Effect

In August 2012 an amateur astronomer spotted a comet; which was later dubbed Perses, Greek god of destruction. While NASA was tracking its trajectory they discovered it would pass dangerously close to the moon causing Earths gravitational field to shift leading to a global catastrophe. The worlds entire nuclear arsenal was launched. Perses was destroyed and rained down on the unsuspecting world. A dormant alien virus triggered by the nuclear radiation swept across the planet leaving death and mutation in its wake.Now its time to survive