An undead apocalypse has ravaged the Earth whilst America's last surviving humans study them from within an underground military establishment. The survivors in the film are horrified at the prospect that they "are the only ones left", creating a crisis within human civilization over whether or not the idea of human society should be continued or abandoned. The living characters in the film are made up of three distinctive groups, each of whom have been given a task by the government - but since the government is no longer providing oversight (and may no longer exist) each group is becoming increasingly subject to temptations that go beyond their instructions. The scientists have been ordered to find a resolution to the epidemic but are tempted to violate nature's boundaries guarding life and death, soldiers who are assigned to protect the doctors appointed to study the zombies but are tempted to enforce fascistic martial law and destroy the specimens in an act of rebellion, and the civilians who are assigned to serve both groups with basic though necessary services like transportation and communication but are tempted to abandon the cause and, instead, live out their last days in reckless abandon.
