Synopsis: Nick Richards is a Biology grad student. He's estranged from his wife, and obsessed with his research.  While at work at the University, six asteroids from deep space, that are too large to burn up in the atmosphere, land on Earth.  Before the asteroids can be examined, they begin to unleash heavier-than-air dust-like spores.  When inhaled, the spores act like a virus and quickly mutate any animal or human into monstrous alien creatures.  This is the aliens’ way of spreading throughout the galaxy. In a matter of weeks the dust spreads across the Earth, reducing civilization to anarchy and a new dark age.  As the “dust level” rises higher and higher, the few remaining uninfected survivors take sanctuary on mountaintops and the upper floors of the world’s tallest skyscrapers - but time is running out. The dust is changing the Earth’s atmosphere into a habitable environment suitable only to the mutants that now roam the dust-covered surface.

After weeks of hiding out in a fallout shelter and without any contact with the outside world, Nick leaves the shelter with two of his colleagues to investigate and find his wife. They find a pitch-black world of desolation that hardly resembles the Earth they once knew.  Almost immediately, they are attacked by the mutants.  Just as Nick is about to be overwhelmed by the creatures, he is saved by a group of survivors wearing makeshift airtight battle-suits.  Nick is air-lifted out of the dust and taken to the top of the Sears Tower where he is introduced to a group of military personnel and survivors who have banded together to stop the aliens.  The resistance has established their base of operations on the top twenty-three floors of the Sears Tower in Chicago.  From here Nick and the team devise a plan to reclaim the Earth.  They must inject the dust-spewing asteroids with an anti-virus that will reform the Earth’s atmosphere.  Using a V-22 Osprey aircraft they go on desperate missions, dropping into the dust, fighting against time and hordes of mutants to save humanity and reclaim the Earth.