Monster

Doom/Ultimate Doom

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

Doom 2/Final Doom
All of the original Doom monsters, plus
 * Arachnotron
 * Arch-Vile
 * Commander Keen
 * Former Human Commando
 * Hell Knight
 * Icon of Sin
 * Romero's head
 * Mancubus
 * Pain Elemental
 * Revenant
 * Wolfenstein SS

Doom 64
All of the Doom 2 monsters, minus the revenant, Chaingunner, Arch-vile and Spider Mastermind but includes


 * Nightmare Imp
 * Nightmare Spectre
 * Nightmare Cacodemon
 * Mother Demon

Doom 3
Of the monsters in Doom 3, some are new versions of monsters from the original games, while some are entirely new. Some of the old monsters, such as the Hell Knight and Demon, are very different then their predecessors.


 * Arch-Vile
 * Cacodemon
 * Cherub
 * Cyberdemon
 * Guardian
 * Demon
 * Hell Knight
 * Imp
 * Lost Soul
 * Maggot
 * Mancubus
 * Revenant
 * Sabaoth
 * Tick
 * Trite
 * Vagary
 * Wraith
 * Zombie
 * Chainsaw Zombie
 * Fat Zombie
 * Flaming Zombie
 * Z-Sec Zombie
 * Zombie Commando

Heretic

 * Disciple Of D'Sparil
 * D'Sparil
 * Fire Gargoyle
 * Gargoyle
 * Golem
 * Golem Ghost
 * Iron Lich
 * Maulotaur
 * Nitrogolem
 * Nitrogolem Ghost
 * Ophidian
 * Sabreclaw
 * Undead Warrior
 * Undead Warrior Ghost
 * Weredragon

Hexen

 * Affrit
 * Brown Chaos Serpent
 * Centaur
 * Dark Bishop
 * Death Wyvern
 * Ettin
 * Green Chaos Serpent
 * Heresiarch
 * Korax
 * Maulotaur
 * Menelkir
 * Reiver
 * Slaughtaur
 * Stalker
 * Stalker Boss
 * Traductus
 * Wendigo
 * Zedek

Enemies

 * Acolyte
 * Bishop
 * Ceiling Turret
 * Crusader
 * Entity
 * Inquisitor
 * Loremaster
 * Programmer
 * Reaver
 * Sentinel
 * Shadow Acolyte
 * Specters
 * Stalkers
 * Templar

NPCs

 * Governor Mourel
 * Macil
 * Rebel
 * Peasants
 * Armorer
 * Bar Keep
 * Becoming Acolyte
 * Beggars
 * Kneeling Guy
 * Medic
 * Oracle
 * Weapon Smith

Technical

 * Monster infighting

Background

 * Models