Why not toss all three together?
The [url=http://www.wikipedia.org/wiki/Godwin%27s_law]-godwinslaw!-[/url]'s, the Demons of Hell, and the Strogg all team up to butt-blam!- Earth, and it's up to Doomguy, B. J. Blazkowicz, and Bitterman to kick their asses.
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That would be an awesome game I would like to play, all 3 army's vs 3 badass soldiers.