"Afraid of death, the helpless young Isabelle, a researcher of the UAC facility within mars sought a last-ditch effort to save herself from the invading forces of hell - she woke a legendary warrior. Inevitably she found herself accompanying the warrior in their efforts to save humanity by closing the portal in hell." Doom Retribution is merely a fan-fiction of DOOM, with a few modified features of the universe and an integration of a Doomgirl which should be a better (if not properly) executed as opposed of the horrible film "Doom: Annihilation". The Doom: Retribution hopefully does Doom-Girl better with more respect to the franchise, and to the Doom-Slayer, all the while introducing some more ideas to the game. Yes, Isabelle is Isabelle because of the Animal-Crossing meme. Also yes, part 1 means there's more parts to come. I had my own concept designs in the form of diagrams, but sadly I don't have the skill, or money to produce them. Oh well.