Visari is gone, but the war is far from over. Helghast forces have mounted a devastating counter-attack, prompting the ISA evacuation of planet Helghan. As new Helghast battalions with more powerful weapons appear, the ISA find themselves outmanned, outgunned and surrounded. The player reassumes the role of Sev, a surviving member of the Special Forces unit Alpha Squad, who must fight against vindictive, merciless enemy forces in a desperate attempt to escape Helghan alive.