These formerly human hosts of a fatal parasite have evolved into dreadful beings determined to eat what civilization has left behind. It is up to you and your friends to take on the enemy, defeat the Ridden, and retake the world because humanity's extinction is at stake. In this four-player cooperative story campaign, you must cooperate to survive increasingly difficult missions as you battle your way through a dynamic, dangerous world. You can lead your team in combat or play online with up to three friends. As you plan against a constantly changing adversary determined to destroy you completely, you can select from eight customizable Cleaners, one of the immune survivors, and a variety of deadly weapons and items.