A massive demonic invasion has overwhelmed the Union Aerospace Corporation's Mars Research Facility, leaving only chaos and horror in its wake. As one of only a few survivors, you must fight your way to hell and back against a horde of evil monsters.
After inspecting the seismic installation (read "Prelude to Evil" readme) you have entered the catacombs of the entrance to Hell where the demons of the invasion. Now that you have come this far, you are not willing to stop and go deeper into the darkness, where beings from the underworld await you, impatient for the taste of burning human flesh...