A small band of urban survivors fight to avoid being turned into zombie slaves when New York City is invaded my evil aliens. Laura Sommers was confiding in her psychiatrist that she'd been hearing disembodied voices when the sky suddenly went dark, and all hell broke loose. Awakening later to find the streets of the city eerily empty, Laura crosses paths with a rambling drifter named Neil who gives a terrifying account of the horrors that have just unfolded. Though it quickly becomes apparent to Laura that Neil is psychologically disturbed, he quickly ushers her to the safety of a nearby warehouse, where many others have gathered to avoid the alien space probes and zombie hordes. In time, the group discerns that the extraterrestrials have been using nanotechnology to enslave the human race, and that the only ones who remain unaffected are the mentally imbalanced. As the voices in Laura's head grow increasingly difficult to ignore, she and the rest of the survivors make one last, desperate attempt to destroy the device being used to control mankind, and send the aliens back into the stars.