Doom is a computer game, released in 1993. Numerous sequels and spin-offs have been made since then.
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Doom and Ultimate Doom 
- "Once you beat the big badasses and clean out the moon base you're supposed to win, aren't you? Aren't you? Where's your fat reward and ticket home? What the hell is this? It's not supposed to end this way! It stinks like rotten meat, but looks like the lost Deimos base. Looks like you’re stuck on the shores of Hell. The only way out is through."
- Knee-Deep in the Dead ending
- "Besides, someone was gonna pay for what happened to Daisy, your pet rabbit."
- Thy Flesh Consumed ending
Doom II 
- "You’ve done it. The invasion is over. Earth is saved. Hell is a wreck. You wonder where bad folks will go when they die, now. Wiping the sweat from your forehead you begin the long trek back home. Rebuilding Earth ought to be a lot more fun than ruining it was."
- Doom II ending
Final Doom 
- "Remember to tell your grandkids to put a rocket launcher in your coffin. If you go to Hell when you die, you’ll need it for some final cleaning-up..."
- Plutonia ending
About Doom 
- This ultimately wonderful classic is truly the most inspirational first-person shooter ever created, and if you had to choose between Doom and another game, I don't care what it is, Doom would always be the winner.
- David Keyes
- In 1993, we fully expect to be the number one cause of decreased productivity in businesses around the world.
- Doom press release by id Software (1993)
- I remember playing Doom 'til 3 o'clock in the morning. It was the first time I had ever been frightened while I was using a computer. And it really opened my eyes - experiences like that are why we play computer games.
- Those seeking the ultimate in home demon protection can now protect their plane of existence with a double-barreled, pump-action combat shotgun that blasts more holes than Mobil Oil.
- GameSpot on Doom II
- Doom is to id Software what Revolver was to the Beatles
- Thematically, Doom was viewed as 'Aliens' meets 'Evil Dead 2'.
- There is a scene in 'The Color of Money' where Tom Cruise shows up at a pool hall with a custom pool cue in a case. 'What do you have in there?' asks someone. 'Doom.' replied Cruise with a cocky grin. That, and the resulting carnage, was how I viewed us springing the game on the industry.
- John Carmack on why the game was named "Doom"
- Bobby Prince was a lawyer before he was a musician. He knew the legal amount of sampling that he could do without getting into trouble.
- John Romero on the Doom & Doom II soundtracks
- I jumped out of my seat the first time I saw one of those pink bruisers, and I cringed when I heard the imps the first time - but when I walked out into that big arena with that rocket spewing giant chasing me down I literally broke out in a cold sweat. Nothing before or since has induced that same mix of adrenaline fueled terror.
- Mark Terrano on the Cyberdemon
- His sound would cause great fear during my gaming sessions. Upon discovery of this character I felt frozen watching him methodically reanimating his brethrens one by one. Carefully he walked to each of the fallen corpses summoning his endless energy into the once lifeless body calling upon it to walk again. The feeling of helplessness combined with a shear state of panic had set in. If left unattended he would resurrect all of the characters I had painstaking silenced one by one. If I was to confront him, I was surely to become engulfed in flames and loose all sense of direction looking for the nearest corner to block his line of sight. If unsuccessful in my search for shelter, I would be dealt with swiftly and forcibly by a power so great I would surely be catapulted high in the air and my lifeless body left to fall to the floor. I'm talking about no other then the Arch-Vile of Doom II.
- Paul Butterfield
- Give a man a fish, and you'll feed him for a day; teach a man to play Doom, and you'll never get another day's work out of him.
- An old Doom map was the inspiration for 2forts, as well as TF itself
- Along with Doom II, we also saw the first traces of multiplayer gaming. Playing it against your friend was something so different, and that is also why we continued to play today.
- It has to be well timed. It needs to have the right components that maybe contain emerging technologies or something like, say, when Doom came out -- the Network play -- there weren't many games like that. There was a really great 3D world that a lot of people hadn't seen. It was light-years ahead of Wolfenstein. It was shareware, so it had Internet distribution. We used the Internet to get it all over the place. So it used a lot of stuff that was just becoming popular at that time. id just capitalized on it.
- It's gonna be like fucking Doom man - after the bombs explode. Tick, tick, tick, tick... Haa! That fucking shotgun [he kisses his gun] straight out of Doom.
- Over the centuries, mankind has tried many ways of combating the forces of evil...prayer, fasting, good works and so on. Up until Doom, no one seemed to have thought about the double-barrel shotgun. Eat leaden death, demon...
- When any device gets smart enough, someone, somewhere ports the classic first-person shooter to it, simply because they can.
- Playing this game for one hour may be acceptable. Playing for many hours could be cause for anxiety and/or depression. Playing for hundreds of hours is getting you ready to take action against anyone who gets in your way.
- John Gocke, in a review of Doom published at Christian Spotlight's Guide to Games in 2000 
- These games are getting really realistic. Next year I might even play in the big Doom tournament. You might wonder what I'm doing here. Well, I'm getting kind of an inside look at some of these new games.
- Don't interrupt me.
- Bill Gates, in the same presentation, shooting a zombie.