WADs in idGames, BOOM
It's going to be one of those days. Once you get a chance to enjoy the hospitality of the welcoming commitee in this level, the warm receptions you will receive from the inhabitants of these fiendish halls will go downhill. Consider this level as a Gothic exercise in wariness. Beware those empty rooms and reap the benefits from the incarcerated fiends.
The Remains of Hell
Before the first DOOM missions, you were one of the ones "voluntarily" sent through the portal that caused so many problems in the first place. You were immediately captured and tortured repeatedly. (long expanse of time skipped) After the end of DOOM 2, with many of the structures destroyed, you were transferred to some underground caverns. During the confusion, you managed to slip a pistol in your pocket. Now, all you have to do is escape, and hopefully find your way back home. See the extra info on the bottom for more ramblings.