chunk: Cannibalistic zombies have overrun the entire world. The remaining fragments of the U.S. government and military hide out in fortified military bases and colonies, attempting to find a solution to the zombie pandemic. Sarah, Private Miguel Salazar, radio operator William "Bill" McDermott, and helicopter pilot John fly from their base to Fort Myers, Florida, in an attempt to locate additional survivors. They encounter a large horde of the undead, and return to their army base in the Everglades, where a small group of scientists, supported by a skeleton crew of soldiers, is searching for a way to stop or reverse the re-animation process.