Following The conclusion Of the original Doom series The sole marine Who survived the horrors of hell had returned to earth recliaming in from the invasion that almost eradicated the human race demons still lingered within the abandoned halls and complexes of photos and deimos as a last ditch effort the military decided to bombard the moons with extreme radiation in hopes of killing off any remaining demons initially it was successful however something survived the exposure the radiation blocked the military's sensors and allowed something to slip pass them undetected this mysterious entiy possessing the ability to resurrect any demon it came across recreated the entire demonic horde and made it stronger than ever before a marine strike force was ordered to contain the advancing armies of hell but was mercilessly slaughtered within moments the players character is the sole serviver of this group
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During the opening sequence, the monsters are killing the Marines on a giant Doom logo. See more
Followed by Doom³