(part three of the three part dooms day series.)-after the earth was attacked by the aliens, you hid inside a secret hidden bunker where the aliens found you. killing them all of in the bunker, you hide in for another two years before finaly getting the courage to come out! its an all or nothing mission, get the three energy crystals, put them in the aliens energy camber, and do the same thing they did to the humans, wipe them out for good! fight off any alien that gets in your way. good luck.
