The Marine learns that the survivors of Earth are trapped in a starbase, the only way to escape the planet. He must clear the way for the evacuation ships .
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"Back at last... You've returned home on well-earned leave. Your drop pod lands with a crunch. You open 'er up and look out. Damn! The city ahead is on fire... Hell, not again! You can feel it. It's all starting again, just like on Mars." Intermission Text Screens
The game begins immediately after the events of the original Doom . Upon returning to Earth, the Marine finds the world overrun by demons :