This page contains tropes for the unique characters, enemies and boss-monsters of Doom 3. For tropes relating to characters of the classic games, see Characters.Doom. For those found in DOOM (2016), see Characters.Doom 2016.
In Doom 3, Doomguy is a marine who simply happens to have the bad luck of being transferred to the UAC's Mars base the day Betruger unleashes hell upon the planet. Through determination, sheer luck, and large volumes of gunfire, he manages to stop the invasion and close the portals, trapping Betruger in Hell after slaying Hell's ultimate warrior, the Cyberdemon.
In Doom 3: Resurrection of Evil, yet another new marine takes up the mantle of Doomguy, this time a marine Engineer exploring Mars as part of an expedition to try and figure out just what Betruger actually did. Discovering a demonic Artifact that Betruger attempts to use to generate a second invasion, he fights his way into Hell and slays Betruger, stopping his plans cold.
In Doom 3: The Lost Mission, the player takes up the role of The Bravo Marine, the sole survivor of the massacred Bravo Team that Doomguy found in the Enpro Plant. Tough enough to survive the carnage, after being dragged through a vent into a different part of the Plant, he fights his way up to Exis Labs, where he travels into Hell at the behest of the surviving scientist Dr. Richard Meyers. His mission: to destroy a teleportation platform that was drawn through the dimensions, which could possibly be used to invade Earth from Hell.
- Action Survivor: Due to the games' restructuring to a more actiony Survival Horror setting.
- Heroic Mime: In typical Doom fashion, they never speak beyond Voice Grunting.
- Hyperspace Arsenal: Carries a pistol, machine gun, shotgun, a chaingun, plasma gun, rocket launcher, chainsaw, grenades, flashlight and Soulcube on him all at once. Resurrection of Evil adds the Grabber Gun, double-barrel shotgun, and Artifact.
- The Stoic: He never shows any kind of emotion, except for shock upon seeing the Cyberdemon.
- Weapon of Choice: Always has his shotgun out in cutscenes.
- Heroic Sacrifice: He enters Hell knowing it's a one-way trip, and apparently dies after defeating the Maledict.
- Nice Job Breaking It, Hero!: The Engineer technically caused the second demon invasion of Mars by disturbing the Artifact. He makes amends by stopping it singlehandedly.
The Bravo Marine
A UAC official sent in to investigate the shady activities of Doctor Betruger in Doom 3.
- Almost Dead Guy: When you finally manage to meet him face to face near the game's end, he is gravely wounded, but he lives long enough to give his PDA (and access) to the Marine.
- Big Good: Got called in to sort through Betruger's shenanigans and get the project's bottom line back on track. When things literally end up going to Hell, he spends most of the game trying to contain the crisis so it doesn't reach Earth, and aiding the marine in trying to figure out just what the hell is going on.
- Badass Bookworm: Despite being a bureaucrat-type, he manages to survive the demonic invasion, and even after his bodyguard's death, he manages to stay alive almost to the end of the game.
- Honest Corporate Executive: He's certainly a refreshing authority to have around given Betruger keeps putting lives in danger (while simultaneously creeping the shit out of all his employees rather than displaying leadership) and is more interested in his infernalist secret agenda than actually running the day to day operations he's supposed to be in charge of. Swann gets fed up with his bullshit pretty quickly.
- Reasonable Authority Figure: Sent in because Betruger has gone off the deep end, and tries to solve it as best he can with the Marine's help.
- The Needs of the Many: Warns against sending a distress signal to the fleet, as this could potentially lead them into a demonic trap that could expose Earth to attack. He's 100% correct.
A tough, imposing looking figure who serves as Swann's bodyguard.
- BFG: He's armed with one of the first functional models and uses it to fight the invasion. Gets stolen by Kelly / Saboath when he mortally wounds Campbell.
- Hero of Another Story: He manages to keep Swann and himself alive and well through most of the game. His mission through the Mars facility matches the Doom Marine's almost step for step, tho he was always just ahead.
- Sacrificial Lion: He gets killed by Saboath.
- The Worf Effect: he is mortally wounded and his BFG stolen by Sarge, to show how much of a threat Sarge is.
The Marine's superior officer in Doom 3.
- Bad Boss: He's verbally abusive and denigrating even for a Drill Sergeant Nasty type character. Then he turns into a cyborg-demon-zombie and tries to kill you.
- BFG: He sports a BFG-9000 when you fight him as Saboath.
- Body Horror: Is fused to a tank and various mechanical parts in the aforementioned fight as Saboath.
- Drill Sergeant Nasty: He has little patience for anyone who slacks off, as the player learns at the beginning.
- FaceHeel Turn: He gets subverted by the demons at some point after the invasion, and ultimately he becomes a cybernetic demon warrior named Saboath, whom you face as a boss-fight.
- Wrong Genre Savvy: After the demons invade, his priority is contacting the Earth fleet for reinforcements. Unfortunately, this is exactly what Betruger wants, so he can use the ships to bring hell to Earth. Although it may very well be that Kelly had been working with Betruger all along even before he was turned into Saboath
A UAC scientist who, having survived the demonic invasion of Doom 3, returns to oversee the operations in Resurrection of Evil.
- Heroic Sacrifice: Tells the Engineer to shut down the Mars base's life support so she has enough energy to power a teleporter to Hell, in order to ultimately destroy the Artifact.
- Morally Ambiguous Doctorate: Zigzagged. Despite her connection to the teleportation experiments, she's the one who blew the whistle on Betruger's activities prior to Doom 3, and attempts to stop the demonic incursion in Resurrection of Evil.
- Small Role, Big Impact: She does not appear at all in the first game (only her PDA can be found), but she's the reason Swann got called to Mars, and is partially responsible for Betruger's plan failing.
The UAC research director on Mars in Doom 3. The revolutionary teleportation experiments are his brainchild and personal project, but he's becoming increasingly unhinged, to the point it's raising concerns amongst the UAC.
- Big Bad: Of Doom 3 and Resurrection of Evil.
- Deal with the Devil: It's revealed in The Lost Mission that the demons contacted him in his dreams, offering him unlimited power in exchange for Earth.
- Devil in Plain Sight: A nearly literal example as he's affiliated with demons, yet despite looking rather like Hannibal Lecter, having a name that's German for "Deceiver", and generally reeking of evil most of the other people don't seem to suspect anything.
- Evil Sorcerer: Betruger turns out to be an evil demon cultist, and wields powerful demonic magic throughout the game.
- Mad Scientist: Responsible for the teleportation experiments that brought the demons to Mars to begin with.
- Meaningful Name: "Betruger" is German for "Deceiver" or "Trickster", and also sounds a lot like "betrayer".
- Morally Ambiguous Doctorate: Firmly on the side of the demons.
- One-Winged Angel: Becomes the Maledict near the end of the original game, and has to be fought in this demon-dragon form at the end of Resurrection of Evil.
- Red Right Hand: His clouded, eerie-looking right eye is a subtle warning that there's something wrong with this guy.
When Hell first breaks loose in Doom 3, the majority of the civilian population are quickly possessed by Demonic spirits and transformed into Zombies. Alone, they're very little threat, due to their lack of agility, but they have a nasty habit of popping up from behind corners.
- Chainsaw Good: Averted. An extremely rare variant with a hunched back and a leather mask shows up in a few spots in the late game that carries one.
- Dead Weight: Fat zombies are a little stronger and do more melee damage than thin ones.
- Everything's Deader with Zombies: They're created by Demonic Possession and arguably Technically Living Zombies (the very first zombie we see is converted straight from a living victim, implying at least some of the others you fight subsequently went straight from alive to zombie without dying first). They have some capacity for tool use, but these basic zombies are slow and stupid.
- Facial Horror: Some zombies come with this, depending on model type; thin zombies can have their lower jaw ripped clean off, whilst fat ones can have their face peeled off, exposing naked skull amidst bloody meat.
- Glass Cannon: They can deal surprising damage (especially the fat ones) but their slow speed and lack of durability cause them to be minimal threats unless they sneak up on you.
- The Goomba: These are the most vanilla enemies you face in the game.
- Unique Enemy: There's exactly one Chainsaw Zombie in the game wearing a party hat (a reference to a PDA email about a party in the Delta Labs), encountered within Delta Labs.
- Zombie Gait: With a few exceptions, most shamble slowly towards you.
Stands for "Zombie Security", the basic security troops of Mars are also quickly turned to Hell by the demonic spirits. They avert their civilian counterpart's Zombie Gait and attack with whatever weapons they had while alive. Though armor style varies slightly (shotgun-wielders are more likely to have open faced helmets), and weapon loadout varies from pistol to machine rifle to shotgun, they're all equal in strength. They equate to the Zombie Troopers of the classic series.
- Everything's Deader with Zombies: They're a variant of the regular Zombies above created from the former Marines serving security detail on Mars. Unlike their brethren, they display no cannibalistic traits and are fast agile, and smart enough to use projectile weapons and basic tactics.
- Eye Scream: Judging by what we see on one of the monitors, as well as the suspicious amount of blood of the machinegun variant's visor, when they were possessed their eyeballs exploded.
- It Can Think: Unlike the normal zombies, these guys can use guns and cooperate with each other to kill you.
- Short-Range Shotgun: Averted: the shotgun-wielding variety has a narrow spread on his weapon, allowing him to shoot from far distances.
- Zombie Gait: Averted: these zombies retain their full mobility from life.
Former elite UAC Marine troops corrupted by demonic energies and mutated into monsters that now serve as Betruger's personal warriors. Dramatically stronger, quicker and tougher than humans, they tend to fight with chainguns or their own bare fists. They're analogous with the Chaingun Zombies from the original games.
- Close-Range Combatant: The tentacle Commandos have no ranged attack, relying on their tentacle and kick attacks.
- Combat Tentacles: Most Commandos sport a single long tentacle for their right arm, which they use to attack with.
- Everything's Deader with Zombies: They're a particularly different version of the Z-Secs above.
- Gatling Good: Later in the game, you encounter Commandos carrying chainguns.
- Made of Iron: Much, much tougher than the Z-Secs you've fought up until this point, even though they're barechested instead of wearing armor.
A heavily augmented demon encountered in Doom 3: Resurrection of Evil and Doom 3: The Lost Mission. Sort of a hybrid of Hell Knight and Mancubus.
- Arm Cannon: Two flame cannons, like the Mancubus.
- Beam Spam: What makes him feel more dangerous than the Mancubus; his attacks do the same damage, but he launches volleys of them with far greater speed than the Mancubus.
- Hollywood Cyborg: Cybernetic legs, guns for arms, and an electronic screen implanted into his face that displays snarling teeth.
- Lightning Bruiser: He's actually squishier than the Mancubus (825 health to their 1000 health), and less potent in melee (he barely does half the melee damage they do), but he moves — and shoots! — a hell of a lot quicker and can easily kill you if you're not careful.
- Playing with Fire: Hurls rapid-fire volleys of fireballs, like the Mancubus.
- TV Head Robot: Their lower face consists of a television screen, which displays a different image depending on its alert state.
These demons are functionally imps on steroids, having a similar attack set.
- Authority Equals Asskicking: They're very high up in the demon hierarchy.
- Composite Character: They're a combination of the original games' Hell Knights and Barons of Hell, with the Baron's resilience.
- Eyeless Face: Played; while they do have eyes (they're in the fleshy parts on both sides of their mouths), they're tough to see, giving them this appearance anyway - perhaps as a contrast to the multi-eyed Imp.
- Informed Ability: An audio log indicates they move quite fast, though in gameplay, they aren't.
- King Mook: They stand head and shoulders above the other demons.
- Lightning Bruiser: In an audio log, the recorder specifically says that something that big should not be able to move that fast, though they move nowhere near as fast in the main game.
- Made of Iron: They can take three direct hits with a BFG-9000 (or one level-3 BFG charge).
- Mighty Glacier: They don't move very fast, but hit hard, and can take a lot of damage.
Large floating demons that spit plasma.
- Airborne Mook: They float in the air.
- Breath Weapon: They spit slow-moving globes of ball lightning, which you can actually disperse with a well-aimed shot.
- Extra Eyes: Have two extra pairs of eyes.
Disturbing enemies, consisting of babies with fly wings and claws.
- Deadly Lunge: They attack by jumping at you from a pretty long distance.
- Fragile Speedster: They're not very strong, but they move very quickly, especially when jumping.
- Mix-and-Match Critters: They have human baby bodies, fly wings, claws, and no legs.
A large quadrupedal demon with an eyeless face and cybernetic lower body.
- Body Horror: According to id Software, they're born with flesh covering their face, forcing them to eat their own face in order to survive.
- Close-Range Combatant: Possessing no ranged attacks, they simply charge at you.
- Cyborg: Their lower bodies are mechanical.
- Eyeless Face: They have no visible eyes.
- You Don't Look Like You: For some reason they look completely different than the original version, being quadrupeds with no eyes or horns and having a cybernetic back half. The only similarity is they are both (mostly) pink.
Leathery creatures with multiple eyes that attack by throwing plasma balls.
- Deadly Lunge: They often surprise you by pouncing at you from unexpected areas.
- Extra Eyes: They have multiple eyes.
- The Goomba: They're one of the most common enemies in the game.
- No Sneak Attacks: They're often kind enough to alert their presence to you by screeching first.
- Took a Level in Badass: They're more dangerous than the imps in the first two games. Instead of just throwing easily to dodge fireballs and scratch you if you get too close, their plasma balls are faster, gives more damage and they will lunge at you with incredible speed.
- Wall Crawling: They often show up by clambering out of vents, climbing up to balconies, crawling down walls or squeezing their way out of gaps in the walls.
Floating head demons propelled by rockets.
- Airborne Mook: They float around.
- Fragile Speedster: They move quite quickly, but go down with just two or three pistol/machine gun shots.
A two-headed demon with five legs.
- Close-Range Combatant: Possessing no ranged attacks, they simply charge at you and try to claw you.
- Fragile Speedster: Much faster than Imps, but even weaker.
- Multi-Armed and Dangerous: They have five limbs.
- Multiple Head Case: They also have two heads.
Giant demons with flamethrowers instead of arms.
- Arm Cannon: Each arm has been replaced by a huge cannon, which they use to kill anything in their way.
- Cthulhumanoid: Their faces have tentacles that make them look a lot like Cthulhu.
- Mighty Glacier: They're the toughest enemies in the game, and their flamethrowers deal a lot of damage, but they thankfully move slowly.
- Playing with Fire: Use flamethrowers.
Skeleton demons equipped with shoulder-mounted missile launchers.
- Artificial Stupidity: They can't attack you if you're standing on a higher elevation, even if it's just a foot.
- Deadly Lunge: Attack by jumping at you.
- Unique Enemy: They're only encountered in Delta Labs in the original Doom 3 after returning from Hell, though they appear a couple more times in Resurrection of Evil.
- Zerg Rush: Like the trites, they attack in large groups.
Demons that resemble upside-down human heads with spider legs.
A demon that can teleport.
- Teleport Spam: They teleport every few seconds to mask their approach.
Floating skulls, only encountered in Resurrection of Evil.
- Revisiting the Roots: Unlike the vanilla Doom 3's Lost Souls, the Forgotten Ones are meant to be closer to the original game's Lost Souls, as floating flaming skulls.
A grayish demon that appears only in Resurrection of Evil. They attack by throwing blue balls of plasma.
A large monstrosity with the body of a spider with a humanoid torso, similar to a centaur.
- Degraded Boss: Downplayed. After being defeated as the first boss, only two more show up as a mini-boss fight, and another in a similar fashion in The Lost Mission, though by that time they're not much more threatening than a Mancubus or Hell Knight.
- Early-Bird Boss: The most powerful weapon you'll have when you first encounter her is the chaingun.
- Fan Disservice: The Making of Doom 3 book states she was built with the concept "Sexy + Gross = Creepy".
- Giant Space Flea from Nowhere: Unlike all the other bosses there is no forshadowing for her and she seemingly just appears at random.
- Monster Is a Mommy: Possibly. Earlier in the game the player hears "They took my baby" said by a voice similar to the Vagary's.
- Also, given that the Vagary's boss fight takes place at the end of the Alpha Labs, which is literally crawling with the other spider-based enemies, the Trites, there is a popular theory among the fandom that the Trites have established an insect-like colony within the Alpha Labs with the Vagary as their queen.
- If you can spare the time to look at the Vargary's abdomen when fighting her, you'll see it's translucent, with a giant demonic fetus floating inside! It actually looks somewhat similar to the Mancubus.
- Spider People: Of the spider-centaur variety. Also has spider-like eyes on their face.
Guardian of Hell
A massive blind beast that chases the player through the bowels of Hell.
- Attack Its Weak Point: The Soul Cube even tells you to.
- Cores-and-Turrets Boss: Half of one; it uses orbiting "Seekers" to compensate for its blindness
Saboath & Sgt. Kelly
The possessed form of Sgt. Kelly. Most of his body has been replaced with military hardware.
- BFG: He has his own version of the trope naming weapon.
- Braggart Boss: He loves to trash-talk you as he fights.
- Tank Goodness: The lower half of his body.
The final boss of Doom 3. Even bigger than before.
- Arm Cannon: His right arm has been replaced with a missile launcher.
- Contractual Boss Immunity: To everything but the Soul Cube.
- Flunky Boss: He's escorted by a lot of minor demons for you to recharge your Soul Cube with.
- Giant Foot of Stomping: His melee attack, which is a One-Hit Kill.
A trio of elite demons sent to retrieve The Artifact and spearhead the second invasion of the Mars base in Resurrection of Evil. The team consists of the Helltime Hunter, Berserk Hunter, and Invulnerability Hunter, which you fight in that order.
- Attack Its Weak Point: The Berserk Hunter. Shoot its "heart".
- Burning with Anger: The Berserk Hunter.
- Flash Step: The Helltime Hunter.
- Shielded Core Boss: The Invulnerability Hunter uses four nearby power couplings to recharge his energy shield.
- Shockwave Stomp: One of the Invulnerability Hunter's attacks.
- Tennis Boss: The Helltime Hunter.
- Victor Gains Loser's Powers: After death, their powers are absorbed into the Artifact for the player to use against the next one.
- Warmup Boss: The Helltime Hunter exists mostly to teach the player how to use the Grabber.
The new leader of Hell, fought at the end of Doom 3: Resurrection of Evil. A giant dragon-like demon that spews fire and summons meteor showers.
- Be Careful What You Wish For: In the final cutscene, he demands that the marine gives him the Artifact. The marine complies, alright... by shoving the Artifact down the Maledict's throat, killing him almost instantly.
- Big Bad: Of Doom 3 and Resurrection of Evil.
- Draco Lich: He looks quite a lot like an undead dragon.
- Contractual Boss Immunity: Inverted; his attacks cut through your invulnerability if you try to use the Artifact.
- Final Boss, New Dimension: Naturally, facing off against the Maledict is done in a particularly isolated part of Hell.
- Flunky Boss: He likes to summon a lot of Forgotten Ones.
- Heads I Win, Tails You Lose: After his health is depleted, the fight immediately switches to a cutscene where he knocks the player character on his ass.
- Nested Mouths: The grotesque "head has a smaller head in its mouth" variant. Inside the skeletal, draconic head of the Maledict is the ranting face of Malcolm Betruger.
- Shows Damage: His wings get more tattered as you cut through his health, serving as a visual indicator for how much damage you've dealt to him.
- Was Once a Man: He was originally Malcolm Betruger.