As in the game Doom.
This dude uploaded this on YouTube a few months ago, it's probably my favorite of all the Doom remixes/re-recordings/etc. from the doom community:
Album art is laughably terrible, but holy shit, the music:
That's a lot better of a cover than the Megadeth cover of the Doom theme song.
The music for both Doom and Doom II just sounded like metal music that had been done MIDI style, so covering it metal style is a no-brainer.