After a successful teleport, our hero ends up on the basement level of AS7 medical research facility. He finds new challenges and evidence of resistance, but still no survivors. The only ones alive are the undead.
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.
In the dawn of the 22nd century, monsters from other dimensions rove the earth as mankind is driven to the brink of extinction. One brave man goes on a mission to rid the earth of these mutants and return them to the hellish pit from which they spawned.