your taken to a science lab from your mom, u have been in the lab since u where 5 and your now 14 when the science lab broke down, u can walk out the door in the large hall and the lights flicker and the halls are empty and cold, u walk out into the world and the city is destroyed and the world seems to be infected by the dead, u can only kill them by shooting them in the head, and u become a badass as it, u find this group of people and u join them but the thruth was that u where the infection