Battle: New York, Day 2 (2011)

Laura Sommer's therapy for hearing voices in her head is cut short when New York City is rocked by an alien invasion. Laura is knocked out and awakens to a city in which the population has been enslaved. The only ones who have kept their humanity are those with imbalances in brain chemistry. Laura must fight off the zombies to reach the Alpha but the voices in her head are growing stronger.