Doom

Doom is the game that started it all back in 1993.

Monsters

 * Baron of Hell
 * Cacodemon
 * Cyberdemon
 * Demon
 * Former Human
 * Former Human Sergeant
 * Imp
 * Lost Soul
 * Spectre
 * Spider Mastermind

Weapons

 * Fists
 * Chainsaw
 * Pistol
 * Shotgun
 * Chaingun
 * Rocket launcher
 * Plasma gun
 * BFG 9000

Episodes

 * Knee-Deep in the Dead
 * The Shores of Hell
 * Inferno
 * Thy Flesh Consumed (added in Ultimate Doom)