You're Ben Riley, Zombies have happened. Time to go Find a Headquarters to hunk down for the Horde. Which is the first mission. You are then tasked with finding supplies (Weapons, Ammo, Food, Medical Supplies, etc.) and some homies to help you hold down the fort. Some of the Zombies have peculiar abilities (A Doctor Zombie can fix up defeated zombies, complete with giving them new limbs.). A Game that was kind of ahead of it's time and has quite a few good ideas.