STORY SO FAR: [Level 1--Contamination (invade1.wad)] Mars Base sent an urgent distress call after a new gateway opened up there. You had been sent on the battlecruiser INQUISITOR to combat this new INVASION... ...but not all had gone according to plan. The ship was attacked and boarded just as it entered orbit around Mars. You awakened from hypersleep to find your crewmates either mutated or dead. Your objective was clear: end the CONTAMINATION or die trying... You finally managed to eradicate all the evil hellspawn from the lower levels of the ship. But, just as you were about to proceed to THE UPPER DECKS, through a viewport, you spotted a huge alien space hulk approaching the INQUISITOR... [end of Level 1] [Level 2--The Upper Decks (invade2.wad)] You must now not only annihilate all intruders aboard the INQUISITOR, but somehow deal with the entire shipload of the alien hulk.