An epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet's surface, to a subterranean lava-flooded mining facility.
Evilcorp is a one map campaign for Alien Swarm by GRRRR aka Schleicher. This is the original version but packed in VPK with fixed file conflicts, crashes and download link. EvilCorp has stolen the Parasite from Mars! Kill Everything!