You and a handful of others form the Last Line of Defense, pooling your remaining stockpile of weapons, special ammo, bunker defenses, and super-weapons to fend off the onslaught by virus infected, bloodthirsty Ravagers.
Humans are all dead and only zombies are alive who have now turned on each other for food. You're one of the zombie factions and must destroy others to survive now.
Try to escape a city that is infested with flesh eating zombies. Find new weapons, upgrade them and kill hundreds of zombies in 10 levels and 3 challenge levels.