After a mysterious illness starts to spread across the world turning people into zombie-like creatures a group of survivors (who have an immunity to the virus for some reason that is never quite explained) take refuge in an old abandoned military base. Our heroes struggle to stay alive, find other survivors, and find a cure for the virus so everything can get back to the way things were before the outbreak occurred. Unfortunately, the virus has mutated and as a result the creatures are starting to change into even more dangerous beings that are intent on ripping anyone they come across to pieces.
