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In the Doom franchise, a monster is any artificially intelligent thing that is not spawned if the -nomonsters parameter is used. In single player and cooperative games, much of a user's playing time is spent in combat with enemy monsters. Monsters are either placed in a level during its design, created by another monster (particularly, the pain elemental spawns lost souls), or spawned by the final boss.

Any monster placed in a level or created by the final boss is initially dormant and becomes active only when it sees a player, when it sustains a damaging attack, or when it hears a player attack, even if this is with the (otherwise silent) fist. When activated, a monster will advance on its target and attack, sensing the location of the thing they are after even if it is out of sight, and advancing toward that location even if it is on the other side of the level. If a monster hits an obstruction during its hunt for its target, it will attempt to walk around it or float around/over it (Cacodemon, Lost Soul and/or Pain Elemental). Monsters that have been alerted normally remain active indefinitely, even after respawning or being resurrected by an Arch-Vile. However, there is a bug which returns any active monsters to a dormant state if the user re-loads a saved game. In general, monsters of different types can accidentally hurt each other and will often turn against each other in such cases, engaging in monster infighting. If a monster defeats an aggressor without ever seeing or hearing a player, it will return to a dormant state.

Monsters can use some types of teleporters, although they do so accidentally or unintentionally, as their intelligence is very limited. Monsters can similarly activate lifts and open certain doors, although some monsters may not fit through doors and openings that are just large enough for the player. Monsters can be hurt and killed by crushing ceilings, but are unaffected by all forms of damaging floors.

The monsters can be classified into two groups: the former humans possessed by demonic forces, and the demonic monsters (demon or hellspawn or if you want to be polite mortally challenged) originating in hell or arriving from there.

Classic Doom games


Doom and its retail extension, The Ultimate Doom, include the following monsters:

  • Baron of Hell: Two of these act as the boss in Knee-Deep in the Dead, resembling large blood red Satyrs. It can hurl streaming balls of green flame or energy and employs a powerful clawing attack at close range. They can take enormous punishment before being slain.
  • Cacodemon: A large flying head-like monster with red scales, horns, and one eye. It moves relatively slowly, but has strong jaws and spits out "lightning balls" from a distance.
  • Cyberdemon: The massive boss in The Shores of Hell, a monstrous humanoid cyborg as tall as two men that can absorb more damage than any other monster and moves at a relatively rapid rate for its size, pausing only to fire rockets from its mechanical arm at anything foolish enough to oppose it.
  • Demon: About the size of a gorilla, this muscular pink brute runs quickly on its two hind legs to bite opponents. While not an immediate threat on their own, when in groups they do have a tendency to try and outflank their targets.
  • Imp: A brown, human-sized humanoid demon that throws round fireballs and claws nearby opponents.
  • Lost soul: A floating, flaming skull that can rush quickly to gore an opponent.
  • Shotgun Guy: A bald, more durable zombie in black armor with a shotgun. A bit tougher than the former human (perhaps due to his rank), but still very easy to gun down.
  • Spectre: Identical to the Demon, except that it is partially invisible.
  • Spider Mastermind: The cybernetic boss in Inferno and Thy Flesh Consumed. It appears as an enormous brain with eyes, a mouth, and comparatively small arms, atop a four-legged metal chassis with an incorporated triple-strength chaingun which will mow down the unwary to bits within moments.
  • Zombieman: Once a marine or guard like the protagonist, now a green-haired, hell-possessed soldier carrying a rifle. The weakest of the enemies in Doom and therefore, the easiest to kill.

See also Player and Barrel.

Doom II

Doom II (and thus also Final Doom) includes the same monsters as Doom in addition to the following monsters:

  • Arachnotron: Strongly resembles the spiderdemon, but is much smaller, and shoots greenish plasma instead of super-chaingun rounds.
  • Arch-vile: A peach-colored, emaciated humanoid demon who is quite tough for its size. It can summon fire, raise dead monsters and is the fastest monster in Doom II (almost one and a half times as fast as the cyberdemon).
  • Commander Keen: A hanged effigy of the cosmonaut from id Software's pioneering series of games only appearing in MAP32: Grosse. It neither moves nor attacks, although killing all four Keen figures is necessary to reveal the exit switch and finish the level.
  • Heavy weapon dude: A tough, corpulent zombie with a darker skin, red armor and carries a chaingun.
  • Hell Knight: Identical to the Baron of Hell but tanned in color, emits higher-pitched sounds and endures only half as much damage.
  • Icon of Sin: Though not technically a monster, it does still represent one of the protagonist's opponents. The principal one, to be exact, that must be defeated to win the game.
  • Mancubus: A grotesquely bloated humanoid with flamethrowers instead of forearms. It moves slowly, but takes a fair amount of ordinance to bring down.
  • Pain elemental: A large flying head resembling a brown cacodemon with small arms. It attacks by spitting lost souls at its target, and even creates a few more as it dies.
  • Revenant: A tall, skeletal demon wearing silver body armor that can launch ballistic or guided missiles, and punch opponents when at close quarters. These are the results of recycled demon combatants.
  • Wolfenstein SS: Populates the two Wolfenstein-themed secret levels and attacks with a medium-strength machine gun.

Newer Doom franchise games

The newer games of the Doom franchise generally include a set of monsters from the PC Doom games or inspired on them and possibly a number of new creations. Various ports include the same sprites as their predecessors, although some change their appearances either to achieve a new style (such as in Doom 64) and the newer games (such as Doom 3) provide polygonal versions that suit their more advanced technology and rendering capabilities.

Doom RPG

Doom RPG features almost all of the monsters from Doom II, with the exception of the shotgun guy, spectre, arachnotron, Wolfenstein SS, Commander Keen and spiderdemon (as well as the final boss). It includes the following unique monsters:

Non-boss enemies in Doom RPG are organized into classes. For example, there are three types of imps, while the knight and baron of hell both belong to the "baron" class. Monsters in the same class use the same sprites, but are somewhat differently colored and vary in difficulty.


The Doom RPG sequel Doom II RPG has almost the same enemy entity set as Doom RPG, but adds a few of its own, even adding a few boss entities. The game adds the following new enemy types:

  • Chainsaw Goblins (Lesser Sawcubus, Greater Sawcubus, Chainstrosity)
  • Sentinels (Brier, Watcher, Sentinel )
  • Zombie Civilians (Zombie Civilian, Zombie Worker, Zombie Tech)
  • Sentry Bots (Red only)

In addition to the new classes of enemies, the game has two new boss class entities; the Pinkinator and VIOS. All the sprite artwork used for the enemies was hand-drawn specifically for this game--even for "classic" monsters returning from previous games in the series--in order to allow for higher-resolution sprites than what was used in the original Doom games (though the higher-resolution sprites are only used on higher-end devices).

Sony PlayStation

The official port of Doom to this platform removes the Arch-Vile but includes an additional monster over the PC versions.

Doom 64

Doom 64 includes newly illustrated versions of the Doom and Doom II monsters, created from high-poly rendered models rather than sculptures or hand-drawings. The revenant, heavy weapon dude, arch-vile, spiderdemon, Wolfenstein SS, Commander Keen and final boss are not present, but instead it features some new monsters:

Doom 3

Doom 3 includes its own versions of many monsters from the original games. Some of these, such as the demon and the hell knight, are considerably different from their predecessors.

Additionally, the following new monsters are encountered:

Some concepts of monsters, one of which resembles the spider-like monsters from Doom and Doom II, were shown by id Software during development of the game but did not make it to the finished product.

Doom 3: Resurrection of Evil

All the monsters in Doom 3 appear in Resurrection of Evil, except the sabaoth, vagary, cyberdemon, guardian, seeker, and lost soul. Additionally, some new monsters are included:

Doom (2016)

The Doom reboot features a lot of returning monsters from the previous three games.

  • Baron of Hell - Are larger than more agile than previous appearances, easily capable of outrunning the player.
  • Cacodemon - Their attacks now blurs the players vision.
  • Cyberdemon - A boss, with several new abilities, including a laser attack and a flame wall.
  • Hell Knight - Resemble their Doom 3 incarnation, but can no longer throw fireballs. Instead they have increased speed and agility to chase and pummel the player.
  • Imp - Far more agile, capable of climbing up walls and leaping over large gaps. Can also charge their fireballs into more powerful versions.
  • Lost Soul - Now explode upon impact.
  • Mancubus - Now covered in armour plating that protects their chests, and can launch their flames in streams rather than just fireballs.
  • Pinky - Covered in thick armour on their faces and have a charging attack, making players have to dodge and attack their vulnerable tails.
  • Possessed - Essentially renamed zombies.
  • Revenant - Now equipped with jetpacks and can unleash much larger barrages of rockets.
  • Spiderdemon - Final boss, equipped with a plasma cannon, lasers, an electric attack and telekinesis.
  • Summoners - Essentially renamed Arch-viles; they have similar abilities to their Doom 3 counterparts, but now float, can travel at untouchable speeds, and have a revamped appearance.

It also includes some new monsters.

  • Cyber-Mancubus - Mancubi with heavier armour, and shoot toxic slime rather than fire, at greater ranges.
  • Gore Nest - Not technically demons, but an important part of fighting them. Gore nests appear as objects to be destroyed to remove "demonic presence" from areas. Destroying them summons a wave of demons.
  • Hell Guard - A trio of bosses, biomechanical suits inhabited by Parasites. They have various flame and energy-shield based attacks.
  • Hell Razer - Similar to an upgraded Possessed Soldier, Hell Razers are demons with an arm cannon that fires a beam of hell energy.

Multiplayer includes two new demons for players to play as.

  • Harvester - A demon that absorbs life energy to fuel its attacks.
  • Prowler - Demons similar to imp, but stronger and without the fireballs.

Doom Eternal

Doom Eternal features several returning monsters, along with a selection of new ones. In this game, they are split into one of five categories: ambient, fodder, heavy, super-heavy and boss monsters.


  • Buff Totem - A new threat which continually summons empowered demons until it is tracked down and destroyed. The Buff Totem is completely immobile and must be destroyed with a melee attack.
  • Cueball - Similar to the Possessed Engineers from Doom (2016), the Cueball will simply stand in place and will become an explosive missile when damaged.
  • Tentacle - Tentacles can be found on certain levels. When approached, they will emerge from holes in the ground and damage the player.


  • Gargoyle - The Gargoyle behaves similarly to the Imp, albeit with the ability to fly.
  • Imp - Returning virtually unchanged from Doom (2016), Imps make up one of the main fight forces of the demonic invasion.
  • Lost Soul - Lost Souls are much rarer than in previous games, with them now almost exclusively being spawned by the Pain Elemental. Other than this, they behave as in Doom (2016).
  • Maykr Drone - The only non-boss Maykr enemies in the game, these drones have highly resistant bodies but can be easily dispatched with headshots. When killed with a headshot, they explode into a pile of ammo, similar to Chainsaw kills.
  • Soldier - The Soldier comes in two variants which resemble the Possessed soldiers from Doom (2016):
    • Soldier (Blaster)
    • Soldier (Shield)
  • Zombie - Returning from previous games, the Zombies behave similarly to the Possessed from Doom (2016) and come in a number of visual variants:
    • Zombie
    • Mecha-Zombie
    • Cultist Zombie
    • Unwilling


  • Arachnotron - Returning from Doom II, the Arachnotron is an agile and tough early-game demon. It has an automatic cannon on its back which can be destroyed with enough damage.
  • Cacodemon - The Cacodemon of Doom Eternal seems to have received a health buff from Doom (2016), however it can be easily staggered for a Glory Kill if a grenade is fired into its mouth.
  • Carcass - This deceptively tanky demon has the ability to summon shields which are similar to those of the shield Soldier.
  • Hell Knight - The Hell Knight returns from Doom (2016), albeit with a tweaked visual design and a more aggressive attack pattern.
    • Dread Knight - This variant of the Hell Knight is a faster, tough and all around meaner variation with twin arm-blades. It is able to use a number of area-of-effect and ranged attacks not available to the Hell Knight.
  • Mancubus - In Doom Eternal, the twin arm cannons of the Mancubus serve as weak points. By destroying them, its attack patterns will be changed and the demon will be weaker overall.
    • Cyber-Mancubus - Returning from Doom (2016), the Cyber-Mancubus differs from the normal Mancubus in that its twin arm cannons can't be destroyed. This demon's armour can, however, be destroyed in a single Blood Punch.
  • Pain Elemental - Returns from the classic Doom games. As before, it summons Lost Souls as its main form of attack.
  • Pinky - The classic Pinky returns in Doom Eternal with behaviour much the same to Doom (2016).
    • Spectre - The Spectre is identical to the Pinky, albeit with the added advantage of invisibility.
  • Prowler - Transitioning from the multiplayer mode of Doom (2016) into the campaign of Doom Eternal, the Prowler is like a bigger, stronger, teleporting Imp.
  • Revenant - The Revenant's shoulder-mounted rocket launchers can now be destroyed, preventing it from using its ranged attacks.
  • Whiplash - A new female demon with a snake-like lower body. The Whiplash is quick-moving and uses a combination of melee and ranged attacks.


  • Arch-Vile - The Arch-Vile returns from the classic Doom games. In Doom Eternal, it behaves similarly to a Buff Totem by summoning and empowering demons for the Slayer to fight. This version of the Arch-Vile can also summon a shield to protect itself from the front.
  • Baron of Hell - Returning from Doom (2016) with an entirely new design, the Baron of Hell is an aggressive and powerful enemy which can attack with a combination of ranged and melee attacks.
  • Doom Hunter - This surprisingly-agile demon is first encountered as a boss in the early game. The Doom Hunter has an energy shield which protects it from incoming damage and a hover-sled which must be destroyed before it can be killed.
  • Marauder - The Marauder is a powerful new demon type which uses an energy shield. He can only be damaged when performing a melee attack with his axe, shortly after his eyes flash green.
  • Tyrant - The Tyrant is the biggest and toughest of the standard demons. It resembles and behaves like a classic Cyberdemon.


  • The Gladiator - A large shield-wielding boss with a two-stage boss fight. His shield mechanics behave similarly to the Marauder.
  • Khan Maykr - The leader of the Maykr race. She has a shield which must be depleted before she can be damaged with a Blood Punch.
  • Icon of Sin - An enormous monster, the Icon of Sin is a rather straightforward fight which simply needs to have its body parts destroyed to defeat it.

Other games based on the Doom engine

Games powered by a modification of the Doom engine include a particular set of monsters suiting their setting, style and game behavior. These monsters share various basic characteristics of the Doom game monsters but may show some differences, such as being capable of multiple types of ranged attacks or being subject to the additional possibilities of game scripting (namely ACS in Hexen).









Doom 1993-2016 Monster Comparison

See also

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