A group of survivors fail to reach an evacuation point set up by the US Army and are forced to fight their way back down to the streets. They are soon contacted by another group of survivors who have procured a subway train that will take them to another evacuation site. 

The group manages to reach the train and help prepare it for departure while fighting off swarms of zombies trying to overrun the train. Though they manage to get the train started, they are stopped by a sealed door that was previously manned by other survivors who were meant to open it upon their arrival. 

After opening the sealed door, the group fights their way to the last Army evacuation site but finds all the ships have left and the remaining soldiers and survivors have been killed. Finding a boat attached to a winch, the group desperately tries to bring it ashore as their last chance of escape while fighting off a massive zombie horde. 

After boarding the boat, the survivors leave New York. Somewhere along the way, however, the boat runs out of fuel and the survivors are once again left stranded in a zombie-infested town. They eventually come across another evacuation site still manned by the Army and full of wounded civilians. 

With the help of a gunship, the group desperately tries to defend the site under siege from multiple hordes as the soldiers evacuate the civilians. Things take a turn for the better when the Air Force arrives and destroys the remaining hordes, allowing everyone else to escape via helicopters.