The year is 2091, 70 years after the events in Killing Floor 2, and megacorp Horzine has produced the ultimate army: an obedient horde of bio-engineered monstrosities called Zeds. Now, the only thing standing between these infernal creations and the future of humanity is the rebel rogue group known as Nightfall. Take on the role of a Nightfall specialist, joining forces with up to five teammates as you battle through a war-ravaged, dystopian future, surviving unrelenting waves of Zeds, unlocking new skills, and building the ultimate arsenal.