This is a paralell dimension which is played between doom episode 1 and 2 and which means after you take the teleporter at the end of the map08 of episode 1 you not die, you will be teleported to earth. As the story, doom guy found's out after he take the teleporter that, this isn't hell or phobos not even deimos no... this is the earth. In his anger he destroy the portal and fight's his way through everything that's come's in his way...
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