All appears normal at first, but one morning you see chaos in the streets, people begin fleeing in all directions. It turns out an unknown virus is in the air, and almost all the people turn into uncontrollable psychos! To survive you begin to take stock of what you have on hand! The first thing you find is your old chainsaw, which hasn't been started for several months, and is stored in a shed near the house. What happens next depends on you!