Who Inspired Doom?
When the game design phase began in late 1992, the main thematic influences were the science fiction action film Aliens and the horror film Evil Dead II. John Carmack instead conceived the basic theme for the game: demons versus technology. Doom was viewed to be a cross between Aliens and the team's favorite horror B movie, Evil Dead II.
John Carmack picked the game's title from The Color of Money. There's a scene in that movie when Tom Cruise shows up with a case. The case, of course, contains his pool cue, but when he's asked what's in it, he says “Doom.” And then he goes on to dominate the pool hall. Carmack said this was how he envisioned id software “springing the game on the industry.”
id Software moved to Wisconsin in the early 90s, and the team indulged their deep love of Dungeons & Dragons, playing extensive games together. The idea to include demons in Doom was inspired by id's most recent Dungeons & Dragons campaign, which had ended with demons overrunning the entire planet.
Although id Software had not designed Wolfenstein 3D to be editable or modified by the players, users did develop character and level editors to create original alterations to the game's content. These efforts strongly influenced id Software to design titles like Doom and Quake to be more easily modifiable for the end user.