Doom (1993 video game)
Doom (typeset as DOOM in official documents and stylized as DooM in other media) is a 1993 first-person shooter (FPS) video game by id Software. It is considered one of the most significant and influential titles in video game history, for having helped to pioneer the now-ubiquitous first-person shooter. The original game was divided into three nine-level episodes and was distributed via shareware and mail order. The Ultimate Doom, an updated release of the original game featuring a fourth episode, was released in 1995 and sold at retail.
Doom (franchise)
The "Doom" video games consist of first-person shooters in which the player controls an unnamed space marine also referred to as "Doomguy". The player has to battle the forces of Hell, consisting of demons and the undead. In the games, the player's character will often go back and forth through hell. "Doom II: Hell on Earth" follows after the events in "Doom", the player once again assumes the role of the unnamed space marine. After returning from Hell, the player finds that Earth has also been invaded by the demons, who have killed billions of people.