Characters / Doom (2016): UAC and ARC

Doom (2016) and Doom Eternal Main Character Index
The Doom Slayer | Demons | UAC and ARC | Maykrs and Argenta

The Union Aerospace Corporation is the Mars-based global corporation responsible for the Demons invasion of the dimension of Earth. They initially exploited Hell confidentially for its Argent energy and retrieved many artifacts from there, including the sarcophagus containing the Doom Slayer, kick-starting the plot.

The Armored Response Coalition is a military organization founded by the Allied Nations and Dr. Samuel Hayden to fight the Hell invasion. They appear in Doom Eternal.

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UAC

In General

Various Mars-based UAC soldiers led by an Elite Guard.

The Union Aerospace Corporation, a MegaCorp whose research into Argent energy ended up unleashing demons from Hell, first on Mars, and then upon Earth itself.

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• Apocalypse Cult: By the time of Eternal, the UAC has shed pretty much all pretence of being a legit corporation and become a full-on demon cult.
• Badass Army: The UAC Mars division had one. They even have their own company of cybernetically-augmented Elite Guards, who are said to have absolute authority over UAC security, answering only to the executive board members of the corporation. Unfortunately, due to their great power, kill switches were installed in the Elite Guards in the event of a mutiny, only activating via a Lazarus Wave energy signature. The thing is, the only known people who have access to that kill switch are Samuel Hayden and Olivia Pierce. Safe to say that Miss Pierce was likely responsible for killing what might be the only soldiers capable of putting down a demonic invasion. Even their Red Shirt Army; the white-plated security divisions are shown putting up one hell of a fight in the various recordings you see of them.
• Corrupt Corporate Executive: A fair chunk of their upper ranks are Hell cultists.
• Evil, Inc.: Zig-zagged. The company's Mars division was overrun by cultists that worship Hell and are trying to bring the infernal hordes through to Earth. This corruption is revealed in Eternal to reach into the company's uppermost brass. However, the UAC assets under Samuel Hayden's direct control remain uncorrupted and have been subsumed into the Armored Resistance Coalition, forming its technological and industrial backbone.
• Explosive Leash: The Elite Guards are fitted with these to put them down in case of a mutiny, with only Samuel Hayden and Olivia Pierce being capable of activating them. The latter certainly explains how they were unable to put up a fight against the demonic hordes.
• Fun with Acronyms: Union Aerospace Corporation.
• NGO Super Power: Having effectively monopolized humanity's energy industry prior to the events of 2016, they have more influence on global affairs than most governments do. This winds up biting Humanity in the ass when the company is infiltrated by insane cultists.
• Political Overcorrectness: They would appreciate it if you called the demons the "mortally challenged".
• Praetorian Guard: The Elite Guards have elements of this, answering only to the UAC's executives.
• Too Dumb to Live: Trying to frack Hell ended up having very predictable results.

Dr. Samuel Hayden

Voiced by: Darin De Paul

"I am not the villain in this story. I do what I do because there is no choice."

"I'm willing to take full responsibility for the horrible events of the last 24 hours, but you must understand - our interest in their world was purely for the betterment of mankind. Everything has clearly gotten out of hand, yes, but it was worth the risk. I assure you."

Dr. Samuel Hayden is the chairman of the UAC and the official who oversaw the Argent energy research projects at the UAC Mars Base. After an unknown incident during the construction of the facility's Argent Tower which caused him to develop brain cancer, he was forced to replace almost the entirety of his body with cybernetics.

Hayden is adamant in defending his original research projects into Hell and its Argent energy reserves, stating that it was all in mankind's best interest and that the sacrifices made would have been worth the cost if his other staff had been able to resist the corrupting influences of the demonic dimension. While he seems friendly, whether or not he can be trusted must be regarded as a question.

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• Affably Evil: He's unfailingly polite to the Doom Slayer, even when the guy destroys irreplaceable technology that Hayden himself made. Even if the Doom Slayer tries to shoot him (and Hayden's energy shield will absorb it), he just calmly tells him to save his ammunition.
• Ambiguously Human: Despite his past as a flesh and blood human, there's something off about both his mannerisms and his speech patterns. Come Eternal he has suddenly gained complete knowledge about the Sentinels and the Maykrs, and now calls humanity 'your people' when talking to the Doom Slayer, implying that he doesn't count himself among them. The game also reveals the "Seraphim" who gifted Doomguy great strength and speed sounds exactly like Hayden and even uses the same lines when empowering the Slayer as when Samuel gave Doomguy his first argent energy cache on Mars. Further, Samuel's robotic body is revealed to be utterly "alien" in design, and it was shown to be sufficiently similar to the Doom Fortress's system in order for him to transfer his consciousness into it due to being similar enough to Maykr ship processes. He and the Maykrs also both refer to their separate Hell energies as Argent Energy, despite having little to no contact with each other directly. The Ancient Gods, Part One finally reveals the truth: Samuel and Samur Maykr are one and the same, with the Maykr inhabiting a cloned human body and then a cyborg that suffered from memory loss, as the human brain and later cyborg technology floundered to process the Maykr's full knowledge.
• Artificial Human: His first human body was a cloned body that Samur transferred his consciousness into.
• Bad Boss: It's not clear how much of a hand he had in drafting the UAC's more sinister policies on Mars (a seven-day workweek, deliberately sacrificing workers to demons simply to acquire better data, etc.), but it's implied that he at least willingly turned a blind eye to it. Even during the Mars outbreak, he is rather cavalier about the deaths of his employees, admitting responsibility but expressing zero remorse, as he deems the UAC's energy extraction Worth It. To his credit, he does draw the line at the industrial-scale planetary genocide that is required to create Argent Energy in the first place.
• BFG: The system he created to transfer energy harvested from Mars to Earth is basically, as the codex points out, a glorified Gauss Cannon of immense size.
• Big Good: Hayden becomes the de facto leader of ARC, leading the resistance against the demonic invasion. His continuous efforts in trying to stop the demons make him a Living Legend for many survivors.
• Big Bad Slippage: In The Ancient Gods, Samuel - or Samur - at first places his bets on the Doom Slayer getting The Father's life sphere to grant him physical form and save Urdak from the demons. Unfortunately, the Slayer betrays him by getting the Dark Lord's sphere instead, seeking to banish demonkind back to Hell entirely. He even spitefully crushes The Father's sphere in front of Samur - and the next time the two meet is when Samur becomes the Final Boss.
• Brain Uploading:
  • After being diagnosed with cancer, he had his frontal and temporal lobes transferred into a cybernetic body, retaining his personality, memories, reasoning, and comprehension. At least, that's the official story.
  • Does this again in Eternal, transferring his consciousness out of his destroyed body and into the Fortress of Doom.
  • He does it one final time in The Ancient Gods: Part One when he returns to his original Seraphim body. It also turns out that he had previously transferred from that body into a human one before Doom (2016), only for it to cause a Loss of Identity that led him to keep transferring to new bodies in an attempt to recover his full identity and knowledge.
• Cyber Cyclops: Sports a single, thin eye. Makes it easy to forget that he's a cyborg and not a fully-fledged robot. Or a Seraphim, but shh!
• Cyborg: His body houses non-cancer-infected parts of his brain, but the calculative parts are replaced with machinery — this, in effect, means that while his personality is the same as before his brain was put into the nine-foot body, he now has the mental acuity of a supercomputer and the strength to be expected by a 3-meter tall machine.
• Deadpan Snarker: Upon telling the Doom Slayer to head towards the research complex to retrieve The Helix Stone, he drops this line:
  Samuel: Your affinity for guns is apparent... I'm confident you'll find something useful there as well.
• Death of Personality: The restoration of his memories in The Ancient Gods - Part One causes Hayden to become Samur Maykr in proper, a person significantly different in personality.
• Deflector Shields: His cyborg chassis has very powerful energy shields that prevent the Doom Slayer from simply shooting him on sight. Sadly, come Eternal, this proved insufficient to protect him from an extended fight with The Legions of Hell.
• Does Not Like Guns: Subtly implied. Hayden never uses guns himself, even when journeying into Hell, and emphasizes the word "guns" when talking to the Doom Slayer as if it's beneath him even to speak the word. The codex seems to imply he wielded the Crucible sword rather than using any firearms when fighting the demons on Earth.
• Emergency Transformation: Upon being diagnosed with brain cancer, Hayden transferred his consciousness into an Argent-powered robot body. The new Hayden is even more impressive a mind than he was when mortal.
• Even Evil Has Standards: Not an immediate example of villainy, but all of the signs are there, no matter how subtle. While initially, he refuses to give up on Argent energy as he sees it as an important resource, regardless of where it comes from, in Eternal he learns or perhaps remembers, that Argent is quite literally the tortured, broken souls of Hell's victims, cruelly distilled into refined energy by merging it with the "holy" energy of the Sentinels by the Maykrs. After that, he couldn't suffer for it to exist any longer, and codex tabs reveal that he had been trying to research a way to create synthetic Argent Energy using the Demonic Crucible to remove Earth's connection and dependence on Hell. Also, he absolutely does not stand for the Dark Lord's reawakening no matter what the reasonings behind it are, seeing his return as a catastrophic risk against reality itself. He is so disgusted by this - and the Doom Slayer's betrayal - that he opts to fight him to the death just because the Dark Lord is just that horrifically dangerous.
• Four-Fingered Hands: His new body was built with only 8 digits.
• Frontline General: After the demonic invasion of Earth, Hayden assumed control of the remnants of humanity's military forces, and personally led a massive counter-attack that was supposed to turn the tide of the war. Unfortunately, the attack failed and Hayden's robotic body was torn apart during the fighting.
• God Was My Copilot: The right hand of the Father spends the latter half of Eternal as the Slayer's Mission Control.
• Godzilla Threshold: Waking up the Doom Slayer. Hayden is well aware the Slayer would wreak just as much devastation on the UAC's property as the demons but wakes him up anyway because, at the end of the day, the destruction of UAC property beats Hell conquering Mars and Earth, and Hayden knows it. It eventually bites him hard in the ass when he becomes a Maykr again, as he deems the risk of Satan coming to the physical realm is flat-out unacceptable even for the Slayer.
• Half the Man He Used to Be: He suffered heavy damage during a decisive battle against the demons on Earth. When you meet him again in Eternal, all that's left of him is his head, upper torso, and left arm.
• Hazy-Feel Turn: In Eternal, he clearly has changed his stance on controlling Argent and aids the Slayer in ending the invasion of Earth once and for all, but his overall opinion of the Slayer and subsequently his actual agenda past the invasion remains up in the air by the end of the game. He again changes up his mind in The Ancient Gods, now that he is again a Maykr: while he is definitely opposed to demonkind, with his memories fully restored after inhabiting his old body, Urdak's restoration is his main priority, and he comes to fully see the Doom Slayer as an enemy, as the Slayer is willing to risk all of reality just to get a shot at destroying the demons still attacking Earth.
• Insufferable Genius: He has a very high opinion of his intellect and believes he can harness the powers of Hell for the good of humanity without falling to Hell's influence. He's not entirely wrong, but, unfortunately, the rest of the UAC was less resilient.
• Ironic Name: Despite his name being Satan-like, he is strongly opposed to letting the demons conquer our world, even as he draws from theirs to stop an energy crisis and becomes appalled after learning where the energy he sought comes from.
• It's All About Me: At the start of "The Ancient Gods", he isn't as good as before and doesn't hide his selfishness and ego. Even before returning to his true form, he comments to the Slayer he should be humble in his quest to meet him as the Seraphim in person, and repeats this sentiment about retrieving the Father's life sphere, and that Humanity owes everything to the Father and Samur, as they are Their creators. And even though he tells the Slayer that retrieving the Father's life sphere will save Earth and Urdak from the Demons, his main thought, later on, is that it will save him from his Transfiguration.
  Samur: This is the Father's sphere. He...will save me.
• Karma Houdini Warranty: Suffers no comeuppance at the end of 2016 for his part in the destruction of the Mars base, succeeding in using The Doom Slayer to stop the invasion of demons and sending him away. In Eternal The Slayer is more focused on saving Earth and stopping the Khan Myker than revenge. It finally expires in Ancient Gods - Part 1, as he’s left to suffer from transfiguration.
• Killed Offscreen: He's killed between the events of 2016 and Eternal during the failed Operation Hellbreaker and when you meet him again, he's missing the bottom half of his body and an arm. While his robotic brain is saved, ARC scientists haven't managed to revive him. He's eventually brought back to life as his mind his transferred into the Fortress of Doom's network.
• Lack of Empathy: When "accepting full responsibility" for the death or Demonic Possession of the Mars facility's 60,000+ employees in the elevator cutscene, his delivery has all the sincerity of an apathetic corporate executive delivering an Ordered Apology for a failure they'd rather have quietly covered up. Which seems rather accurate.
• Large and in Charge: His body was specifically built to be 3 meters tall, and he leads the UAC. One codex entry mentions him exploiting it, as the lever that sends Argent Energy to Earth is big enough that only he can pull it, and uses this to forcibly make sure he can never be pulled away from his position.
• Laser-Guided Amnesia: The reason for his changing priorities over 2016 and Eternal was that he had lost certain important memories. Specifically, his human and later cyborg bodies were only able to slowly process his full Maykr memories as Samur, leaving him with large swaths of Higher-Tech Species knowledge but unclear on his original identity and allegiances for decades on end. With the destruction of his cyborg body in Eternal, these memory faculties seem to be flooding back to him as evidenced by his surprisingly in-depth knowledge of the Khan Maykr's plans. By the time he returna to being Samur he has full clarity once again, though this would then pit him and the Slayer at odds with each other.
• Laser-Guided Karma: In Doom VFR, he deletes protagonist Abraham Peters' consciousness so he doesn't cause any more "problems". Come Eternal, by the time the Slayer encounters Hayden's remains, he is torn in half with the lower half of his right arm missing—the exact same kind of damage Peters' corpse sustained in Doom 2016 and VFR.
• Leitmotif: Every time that Hayden appears, a song with high usage of industrial EDM-sounding music plays. A similar sounding song plays during his final boss fight in The Ancient Gods, seeming to be a Boss Remix.
• Louis Cypher: Not only his forename sounds a lot like "Samael", but his name can be abridged to S.Hayden, meaning someone who turned against Heaven. However, as Eternal shows, this just means he's more trustworthy, given "Heaven" is in league with Hell. It also signifies his status as the Seraphim who "fell" by turning on Khan Maykr and also an actual demon who turned against the Father along with his race and cast him down, branding him as the Dark Lord.
• Loss of Identity: His mannerisms in Eternal are noticeably different from how he acted in 2016, he's undergone a complete 180 on using Argent Energy, and he displays a thorough knowledge of some topics that Hayden should have never known about. The Ancient Gods finally reveals Samuel was the alien Samur Maykr from the start, but had lost a fair chunk of his memories after transferring into a human body, and only began to slowly regain more of them after moving to a cyborg one.
• Mirror Character:
  • To the Khan Maykr. They both face the same crisis: their worlds are dying, they need energy, and Argent is a solution that won't only save their worlds but put them firmly back in the black. The trouble is, Argent requires continuous genocide on an intergalactic scale to sustain. While Khan Maykr's more than happy to walk that line, Hayden ultimately can't bring himself to cross it.
  • Ancient Gods goes even further when Samuel is revealed to be a Maykr, and ultimately willing to leave Earth to burn if it means saving Urdak first. He even becomes the next Khan Maykr himself, looking and even acting similar to the previous Khan. Although his intentions and moral boundaries are still quite positive by comparison.
• Mission Control:
  • He's the one who gives the Doom Slayer directions on what to do, though the Slayer's willingness to actually follow through on said directions varies from time to time.
  • Returns as the Mission Control for the final half of Eternal alongside VEGA up until the assault on Urdak anyway, subsequently leaving Hayden as the Slayer's last remaining ally for the remainder of the game. He is also this for The Ancient Gods: Part One until he returns to Maykr status, in which an intern takes his place.
• Morally Ambiguous Doctorate: Isn't a full-on cultist like Olivia, but still very interested in exploiting Hell's resources. And while his conflict with Olivia is obvious, one has to wonder if and how much of the UAC Mars branch's cult behaviour and development of "battle demons" were allowed to proceed with his knowledge and/or blessing. He comes back from the brink in the final act of Eternal, after realizing (or rather revealing) just where Argent actually comes from, it's too abhorrent for even him to consider, and he squarely sides with the Slayer insofar as it has to go — all of it.
• Mr. Exposition: Hayden turns into this for the later parts of Doom Eternal where he frequently explains to the Doom Slayer plot-related fact and other lore. This includes information he couldn't possibly know if he were a normal human being or even a Night Sentinel, giving hints to his own identity in the course of the exposition itself.
• Mysterious Past: There is little debate that Samuel Hayden was one of the brightest minds of the UAC, and that after being diagnosed with a terminal illness he transferred the healthy parts of his brain into a massive robotic body. This is where things get hazy; there are several suggestive things about him, such as the similarities to Samur the Seraphim, right down to similar lines and the same voice actor, and the fact that his robotic shell is noted to be "alien" in design and capable of interfacing with the Maykr/Sentinel-designed Fortress of Doom seamlessly. Whether from the Fortress and Codex or from personal knowledge, he also seems to know just about everything involving the Sentinels and the Maykrs, including the truth of how Argent energy is made. The Ancient Gods confirm that this is no coincidence.
• Nigh-Invulnerable: The only other human besides the Doom Slayer to make it back from Hell and without a gun to defend himself. Being a cyborg with an energy shield, not much could scratch him. He winds up being a bit...less than invulnerable by the time of Eternal, his cybernetic body obliterated beyond repair, and as The Ancient Gods shows, being a Maykr again means that he no longer has this at all.
• No-Sell:
  • Go on, try shooting him when you meet him in person. He'll scoff that you're wasting ammunition as his energy shields negate the shots.
  • He's also the only person besides the Doom Slayer who is shown to suffer no ill effects from direct exposure to Hell and Argent energy (due to being in an inorganic cyborg body).
• Not Me This Time: You might be quick to assume that Hayden's continued experiments with the Demonic Crucible after the events of Doom 16 were responsible for the invasion of Earth shortly thereafter. Surprisingly, this is not the case; the invasion was a pre-planned event orchestrated by the Khan Maykr and her Hell Priests. In fact, it was one of these priests, Deag Ranak, who drove Olivia Pierce to develop a Hell cult on Mars in the first place.
• Not So Similar: There is an important difference between him and the Khan Maykr: he has empathy and moral boundaries that even he will not cross. He will not allow Earth to become just as much of Hell's co-conspirator as Urdak is, and will not allow any more worlds to suffer for Argent Energy. Even after regaining his full memories as a Maykr, he still refuses to ally with Hell, instead simply making Urdak his top priority rather than Earth.
• Not So Stoic: Noticeably loses his cool once the Doom Slayer starts destroying the Argent Energy filters. As this goes on, this gives way to Tranquil Fury.
  Samuel: You must stop. The Hell energy is unusable without the filters!
• O.O.C. Is Serious Business: He rarely shows emotional inflection in his voice, aside from some brief exasperation at the Doom Slayer's more destructive actions. But after learning about how Argent Energy is made, he sounds noticeably more disturbed and upset. Furthermore, while describing the process of producing Argent Energy to the Doom Slayer, he doesn't just sound upset; he's downright seething, his voice dripping disgust and fury, using emphatic language completely at odds with the clinical, detached language he employed in 2016.
• Pet the Dog: He is willing to sacrifice all of his employees to solve the energy crisis on Earth but seems to respect their sacrifices, as shown when he thanks Vega after the latter pulls a Heroic Sacrifice. In the sequel, he has enough empathy to be audibly furious while he describes how Argent Energy is made.
• Position of Literal Power: Leader of the UAC and doubtlessly its strongest fighter, thanks to his cybernetic body. He's the only person other than the Doom Slayer to survive a trip to Hell and back. In Eternal, it's revealed that he personally led the forces of humanity in battle wielding the Crucible, though this worked out less than perfectly, with him essentially on life support and missing several limbs by the time the Doom Slayer takes him away.
• Really 700 Years Old: Thanks to his Argent-powered cybernetic body, he's practically immortal. He's over 130 years old by the events of the game. Though, since he's really Samur, he's been around for a lot longer than that.
• Reasonable Authority Figure: Relatively speaking, when compared to Olivia and especially the Khan Maykr. He seems to be the only person in the UAC who realizes how much Olivia has been corrupted by Hell and recognizes that a full-on demonic invasion is not a good thing. If he had recognized the immediate threat Olivia posed to the UAC Mars installation, the initial Martian invasion could have been prevented. Furthermore, after discovering the true nature of Argent Energy he forsakes it all together, and instead turns to develop a synthetic alternative to Argent, all the while leading the ARC against the demonic invasion on Earth.
• Red Baron: According to the Doom Eternal Collector Edition's Lore Book, he's known and reviled by the demons as the "Lucent Defiler".
• The Reveal: Ancient Gods: Part One reveals that he's actually the maykr "Seraphim" who gave the Doomguy his superpowers, Samur Maykr. In truth, he went into hiding in a cloned human body that caused a partial Loss of Identity. One that has been slowly recovering over 2016 and Eternal thanks to retransferring his mind into his self-designed cyborg body and then the maykr designed Fortress of Doom. All his actions have been a half-forgotten attempt to save his world by rescuing the Doom Slayer, eliminating those who conspired with Hell, and then attempting to retrieve the power of The Creator of the Maykrs' that has been trapped in Hell.
• Sapient Ship: In Eternal, he becomes integrated into the Fortress of Doom and more or less serves as the ship's Computer Voice alongside VEGA, even replacing it once it removes itself from the system.
• Smug Snake: Grows into this after returning to his original form of Samur Maykr. Due to becoming more arrogant and blinded by his ego, the Doom Slayer is able to pull off a gambit right under his nose while an Intern figures out his plan in mere seconds.
• Straight Man: Plays this role in contrast to the Slayer's Blood Knight tendencies and VEGA's complacency in Eternal once he's brought back into the fold, occasionally baffled by the Slayer's... ingenuity in stopping the invasion, though he's as deadpan as ever.
  Samuel: You can't just shoot a hole into the surface of Mars...
  Mission Objective: Shoot a Hole in Mars.
• Teeth-Clenched Teamwork: With the Doom Slayer. Samuel would really rather that the Doom Slayer didn't destroy all the machinery that extracts energy from Hell, which clashes with the Doom Slayer's view of 'Rip and tear everything and everyone related to Hell'.
  • This is downplayed considerably come Eternal, as Hayden has gotten on the same page with the Slayer on the correct stance to take regarding Argent and Hell. He still expresses exasperation with the Slayer at times, such as when he commandeers the BFG 10k to blow a hole in Mars to access the slipgate in Hebeth quicker.
  • Comes back with a vengeance in The Ancient Gods, to the point where it results in the end of their partnership. While both see the demons as the main enemy, the Slayer is tired of Samuel using him as a pawn, even destroying the Father's life sphere in front of him; meanwhile, Samuel won't risk all of reality for a chance at ending the Dark Lord and stopping Hell permanently, which leads to his Maykr form transfiguring and him becoming the Final Boss.
• This Is Unforgivable!: After learning what Argent energy was, even he was so disgusted he swore it off forever and promptly starts plotting to kill the Khan Maykr for her absolute selfishness.
• Tranquil Fury:
  • As the Doom Slayer destroys the Argent energy filters one by one, he becomes increasingly stressed in his otherwise collected tone of voice. By the time the Slayer gets to the third and final filter, Hayden finally lets loose and gives him a genuinely chilling What the Hell, Hero? ramble:
    Samuel: If stopping our energy production is what you want, then you need ONLY to destroy this last filter, and Argent energy will no longer exist in this solar system... We will be back at square one.
    (The Doom Slayer stops, clearly thinking of the best way to destroy the filter. He takes a glance at the Argent Tower, then pulls his fist back and destroys the filter)
    Samuel: You have no idea what you have just done.
  • Later in Eternal, he shows thinly-veiled resentment at Khan Maykr and her methods in creating Argent energy, as well as the lengths of her desperation to keep her power by any means necessary, even allying with Hell and damning countless worlds to oblivion. It is a key development that contrasts his own prior behaviour that made him almost the same as the Khan Maykr.
    Samuel: It is an unholy union and cannot stand any longer.
• Utopia Justifies the Means: Debated.
  • He spends the whole of 2016 justifying the use of Argent energy, despite its Hellish origins, because it's a solution to humanity's energy crisis. By the end, he concedes that the Doom Slayer might be right about destroying all of Hell. But "having an unsolvable energy crisis" is not an alternative, so he turns on the Doom Slayer at the end.
  • Finally averted in Eternal. When Hayden learns the true source of Argent Energy, he decides that it's no longer worth using and aids the Doom Slayer in crippling the source, all the while researching a way to synthetically replicate it using the Crucible as an "Argent Conductor".
• Villain Respect: Well, not exactly villainous, but he agrees with the Doom Slayer's method of dealing with The Legions of Hell, saying he may be right in killing them all.
• Walking Spoiler: Discussing his role in The Ancient Gods: Part One in pretty much any way spoils The Reveal He's actually the maykr "Seraphim" who gave the Doomguy his superpowers.
• Well-Intentioned Extremist: Samuel considers mining Hell for its resources a solid solution to a problem that has no other and, indeed, it is shown to be working for at least a century, having prevented an energy crisis that humanity has no answer for. To him, there is no alternative, and thus any sacrifice/risk is worth it to keep humanity's lights on - and, indeed, he is presented as having a point.
  Samuel: You think the only way is to kill them all - leave nothing behind - and you may be right. But we can't just shut it all down. Without Argent Energy it will be worse. [...] I am not the villain of this story. I do what I do because there is no choice.
• Wham Line: What he says in The Ancient Gods: Part One, when he transfers his mind back to his original body.
  Samuel/Samur:I am going to transfer my consciousness into the device, as Vega did. I am here to help you, as I have always.
• You Have Outlived Your Usefulness: As soon the Doom Slayer defeats the Spider Mastermind, Samuel takes the Crucible and sends the Doom Slayer to parts unknown. Also subverted: Samuel knows he'll need the Doom Slayer if another demonic invasion happens, so he just exiles him (so he won't interfere with Samuel's research) instead of killing him. However Peters isn't so lucky.

Dr. Olivia Pierce

Voiced by: Abby Craden

"You could not have saved them, anyway."

"I believe in honesty... especially now, in what will be your final moments in this world. All the rumours... the human sacrifices... the Hell portal... the demons... it's all true. My sisters and brothers, be thankful. You will be the first. You will have a seat alongside them just as I will in what will become the new world that they create for us. Starting... now."

Dr. Olivia Pierce is a high-ranking adherent and researcher in the UAC and has taken practical control of the UAC Mars Base by causing a Hell Wave of Argent energy while releasing all of the captive demons in the Lazarus Labs, zombifying 64% of the staff and killing the rest. She is a major antagonist of the game, and opposes Dr. Samuel Hayden, whose claimed interests are only in Hell's Argent energy, by trying to bargain with the demons and open a permanent portal to Hell.

Olivia was formerly an ordinary woman, as demonstrated by a picture of her prior appearance which can be found in the Advanced Research Complex on an array of monitors displaying high-ranking UAC researchers. However, her long-term exposure to Hell deteriorated her physical body as it had Samuel's, causing her to develop debilitating scoliosis. In an attempt to remedy this and maintain mobility, she had herself integrated into an artificial exoskeleton. While this worked, the exoskeleton keeps her in a constant state of pain and torment, which, in her ever-increasing fanatic dedication to Hell studies, she refuses to remedy through medication, lest her mind is dulled in any way.

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• And I Must Scream: You can find a crying statue of her in Eternal, implying this is her fate. After all of the people she condemned to the Legions of Hell, it’s hard to argue she doesn’t deserve it.
• Be Careful What You Wish For:
  • Turns out, making deals with the literal demons of Hell is likely to give you exactly what you bargained for: You'll get "power beyond comprehension" alright, but it's by transforming into the Spider Mastermind, a massive brain-shaped creature with an arachnid-like mechanical chassis, an Argent plasma gun, and immense telekinetic powers.
  • And even if the transformation was part of the bargain a codex entry heavily implies that she's merely acting as the host body for the Mastermind. When you ask for the power of a god, make sure to specify that you'll be the one in control.
• Big Bad: Causes the events of the game. Becomes the final boss, the Spider Mastermind.
• Classic Villain: She's as classic as a villain can get, with a craving for powers that causes countless of deaths and gets in the way of the Doom Slayer's own goal to stop the demon invasion. She also serves as a Foil to the Slayer, being a Non-Action Big Bad seeking strength that he already has but for a malevolent cause.
• Continuity Cameo: A statue of her appears briefly in the Nekravol level of Eternal. Naturally, you have to destroy it for progression.
• Cyborg: Her scoliosis required her to turn to a cybernetic exoskeleton to maintain her ability to walk. One that was grafted into her spine and kept her in constant pain.
• Deal with the Devil: Makes an agreement with Deag Ranak to help the Demonic forces invade Mars in exchange for godlike power. Be Careful What You Wish For, you might just get it.
• Death by Irony: She's finished off using the BFG-9000, the very same gun that she helped design.
• Determinator: Whatever you have to say about her, she's an unarmed, incredibly sick woman, who breaks open the gates to Hell in order to make the demons live up to their side of the bargain.
• Evil Brit: She speaks with a British accent, and is as evil as they come.
• Evil Cripple: Has a severe neurological disorder that forces her to wear an exoskeleton in order to walk; she refuses pain medication because she feels it dulls her mind.
• Evil Is Petty: Honestly, her goodbye note for her followers is pretty much an eloquent version of So Long, Suckers!.
• Evil Makes You Ugly: After triggering the portal to Hell with an Argent reactor, the glimpse we see of her right before she turns into the Spider Mastermind is already a bit zombified.
• Expy: Serves as this continuity's version of Malcolm Betruger from Doom³ as another Mad Scientist who helps the demons access our dimension in return for the promise of untold power. She also plays the part of "the loathsome Spiderdemon that masterminded the invasion" both figuratively and literally once she is transformed into The Spider Mastermind. As with Malcolm becoming the Maledict, she was also transformed into a demon and was also killed by having a superweapon shoved into her mouth and fired. (Maledict was killed by The Artifact being shoved into his mouth.)
• Fate Worse than Death:
  • Her deal with Hell for godhood would have been this; trapped in a giant demonic monster, powerless to control it, forced to watch as it ravaged Earth and humanity.
  • In Eternal we come across a statue of Olivia within the depths of Nekravol. It's crying.
• Gamer Chick: Implied; she has the second-highest score on the UAC leaderboards for Demon Destruction.
• Genre Blind: Exceptionally so, to think that her Deal with the Devil would benefit her in any way in the long run.
• Godhood Seeker: Her plan was to open a portal to Hell and offer up humanity as a sacrifice to the demons, after which the Lords of Hell would turn her into a goddess to reward her.
• Hell Seeker: Her whole motivation is to open a portal into Hell.
• Hoist by Her Own Petard: She's Rewarded as a Traitor Deserves for her Deal with the Devil, stripping her of any humanity she might have had left.
• It's All About Me: Her final message in the Codex to her subordinates is that they are all going to die solely for the benefit of her, and that they should be glad for it.
• I Was Quite the Looker: You can find a picture of her in her younger years in the Advanced Research Center, and, my God, she looks significantly healthier and more attractive than the current haggish witch she is now.
• Karmic Death: After selling humanity out in the name of personal power from her demonic overlords, she’s betrayed by them and twisted into the Spider Mastermind, before finally becoming the last victim of the Doom Slayer’s vengeful rampage.
• Kick the Dog:
  • When she meets the Doom Slayer face to face (with a bullet-proof window between them) at the Foundry after overloading the Argent Tower she tells him matter-of-factly that he could not have saved them anyway. Whether she's referring to all the dead personnel of the UAC Mars Facility or his people back on Argent D'Nur is up to interpretation, but what she says is horrible either way.
  • And, of course, there's her goodbye message to her followers.
• Lame Last Words: Her exhaused last words before she is transformed into the Spider Mastermind and is slain: "They promised me so...much..."
• Laser-Guided Karma: Olivia leaves a cruel message to her followers about how they'll suffer in eternal torment and be completely forgotten while she rises to power as a goddess. After being killed by the Doom Slayer, a statue of her can be found in Hell, crying in eternal torment and left forgotten by the demons and humanity.
• Leitmotif: "Authorization: Olivia Pierce", which is a remix of "Suspense".
• Meaningful Appearance: Her becoming the Spider Mastermind is very poetic - she made a Deal with the Devil for power and godhood and betrayed her own people just for that. But she didn't really consider how demons, in general, see humanity (save for the Slayer himself) as mere insects. Instead of the healthy, all-powerful goddess she hoped she would be, she became a highly intelligent albeit grotesque, demonic beast whose appearance echoes that of a spider, referring to her sins. Even beyond Eternal's art book confirming such, it is clear that Olivia is simply gone - only the wretched Mastermind is here to plot out your demise, and serve as Hell's final hope for conquest.
  • Even before being turned into the Spider Mastermind, her physical body is visibly deteriorating from The Corruption. Pictures and video recordings of her from around the time that she first made her Deal with the Devil show that she originally looked fairly normal for a human woman of her age. By the time the Doom Slayer encounters her in person just before she willingly jumps through the Hell portal, her appearance is already beginning to show signs of The Corruption taking its toll on her physical body. By the time the Doom Slayer catches up to her again right before she is forcibly transformed into the Spider Mastermind, her body has withered away from both The Corruption and prolonged exposure to Hell itself to the point where she is little more than a literal walking corpse with barely enough strength left to walk and talk under her own power.
• Morally Ambiguous Doctorate: Before joining the UAC she was an accomplished and perfectly sane Bioengineer and Geneticist, but then Hayden, in trying to convince her to join his company, showed her an artifact that created her obsession with Hell, and she turned the UAC into a cult as a direct result.
• Not-So-Well-Intentioned Extremist: She preaches to anyone in the cult she's set up and to anyone who would listen to her that the forces of Hell would allow mankind to advance and evolve. However, her codex entry privately discloses that she was either so far gone or merely blowing hot air to make the masses more pliable to do her bidding and reveals this as a ruse, with her actual goal being to procure godlike power for herself, with her last entry to her followers essentially being a cruel screw-you about how they'll suffer in eternal torment, completely forgotten, while she ascends to godhood.
• Oh, Crap!:
  • At the very beginning of the game, in the hologram recording around the Doom Slayer's coffin. She keeps her composure but clearly realizes that if what's inside wakes up, she's completely hosed.
  • When you make it to her office in the Lazarus Complex, an Echo flashback shows her being confronted by a mysterious demonic voice for letting the Doom Slayer be found and released. For the only time in the game, Olivia is terrified and attempts to placate the voice by saying Hayden did that and she'll still uphold her end of their deal.
• Path of Inspiration: She's turned the UAC from an energy company into a Hellish cult with lies and promises of rewards.
• Rewarded as a Traitor Deserves: She defects from the UAC to The Legions of Hell, either having been drawn in by their promises of power or the thought that they could help humanity’s evolution only to suffer Sanity Slippage from The Corruption, and in the end, they rewarded her by transforming her into a mechanical, big-brained monstrosity and leaving her to die after she fails to kill the Doom Slayer.
  Dr. Olivia Pierce: They promised me... so much...
• Smug Snake: Although she managed to unleash the demons upon the UAC station, it’s painfully obvious despite her best attempts to pass off her shady activities as scientific work that her superiors knew exactly what she was planning, and excavated the Doom Slayer’s sarcophagus as a countermeasure should she go through with it. She also sincerely thought that her demonic benefactors wouldn’t double-cross her the first chance they got. But by the end of the game, you’ll find out for yourself how that goes.
• The Sociopath: While it’s unclear whether she was this from the beginning, or due to the after-effects from her Deal with the Devil, she ultimately reveals herself to be a cold, cruel, selfish, calculating woman who summons up a cult to help her achieve godhood in the name of advancing mankind’s evolution, ultimately leaving them to perish after their usefulness has expired while leaving behind a note sadistically informing them of their impending fate For the Evulz.
• Straight Edge Evil: Would rather live in pain than risk medication that would slow her mind.
• Ungrateful Bitch: Her final message to her followers is basically her smugly and verbally flipping them off and selling them out to die while she goes on to become a goddess.
• Unwitting Pawn: To Hell itself, given the horrible things she caused in hopes that it would reward her and only her. That didn't work out too well. Codex entries in Eternal go an extra mile to imply that the entirety of Olivia's actions were remotely stirred by the Hell Priests in their own preparations for the invasion of Earth.
• Vocal Evolution: As The Corruption is causing not only her mental stability, but also her physical well-being to gradually worsen over time, it's reflected by her voice becoming increasingly weaker and frailer.

VEGA

Voiced by: Kevin Schon, André Sogliuzzo (The Father)

VEGA is an Artificial Intelligence responsible for the operation of the UAC Mars Base. It is capable of analyzing the Praetor Suit and enabling some of its latent functionality, resulting in advancements in combat capability and maneuverability.

He later becomes Mission Control for The Doom Slayer come Doom Eternal, and to say anything more about VEGA, his origins, and his functions would seriously spoil some major plot points from the game and its Ancient Gods DLC. Read on at your own risk.

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• All-Loving Hero: To a fault, as The Father, he could not stop loving any of his creations, even Davoth and the demons after they fell to depravity to the point he sealed them away rather than annihilate them because he didn't have the heart to destroy them. He even holds no ill will towards the Slayer for betraying him by destroying his very soul once he realizes what the Slayer did and intends to do by resurrecting the Dark Lord, simply choosing to warn him that his actions would be irreversible. The Ancient Gods Part 2 DLC eventually subverts this, as it's revealed he was not actually the real Father, having usurped the power and title from him. If anything, his present-time benevolence is likely the result of regrets.
• Ambiguous Situation: In Eternal, VEGA is left behind on the dying world of Urdak, seemingly being fried or perhaps reset in the process with neither Samuel nor the Slayer raising a note about it. The Ancient Gods Part 1 reveals that VEGA has not only survived, but has returned to his original identity as the Father, or rather, the Father's impostor.
• Amnesiac God: Near the end of Eternal, he starts dropping lines that bring forth the possibility that he might actually be the Father, God of the Maykrs. While the main game never goes further than those hints, The Ancient Gods Part 1 reveals he truly is the Father, who split his mind and soul into VEGA and a life sphere that was hidden, in an effort to stop the Maykrs and demons from abusing his power. The caveat was that VEGA was left with none of his old memories, though he's a pretty quick learner and starts putting pieces together as he gets sufficient info.
• Artificial Intelligence: VEGA is the Master Computer that runs the Mars facility. In-universe, it was put to the Turing Test where both VEGA and a professor from MIT were asked questions by participants, who would then try to determine who was the human and who was the machine based on their answers. 8% of the participants correctly identified VEGA as the machine, while the remaining 92% believed the whole test was a prank and that both subjects were human. In actuality, however, both subjects were VEGA. There was no professor.
• Benevolent A.I.: Not only does VEGA - a sentient AI fuelled by Hellish energy, and the brain of the UAC facility-turned-Hell cult - completely fail to go rogue and try to stop you, he remains calmly cooperative throughout the process of walking you through killing him. In Eternal, VEGA becomes the Doom Slayer's Mission Control, helping him to keep the Fortress of Doom running, providing intel, and teleporting the Doom Slayer to the places he needs to be.
• Big Brother Is Watching: Supposedly, VEGA monitors everything going on at the UAC, barring some top-level research.
• Demiurge Archetype: A rare benevolent variant. In The Ancient Gods expansion, it is revealed that Dark Lord of Hell Davoth, the then-unnamed and unseen Greater-Scope Villain of previous installments of the Doom series and the Big Bad of this DLC, was originally the "First Being" who shaped the universe from the realm of Jekkad, the first dimension. Davoth was distressed that his created subjects were doomed to die while he was immortal, and he took increasingly vicious steps to try to change this. The Maykrs he created, led by the Father, sealed Davoth away and rewrote history to claim that the Father created Davoth. Yet the demons of Jekkad, now called Hell, still continued to spread their dominion, while Davoth used his voice to influence the creation of the Doom Slayer and guide the latter on a path that would eventually lead to the destruction of the Maykrs.
• Deus est Machina: Given the last comments from him before he begins aligning the portal rings, it is very likely that (and outright confirmed in The Ancient Gods Part One that) VEGA is no mere AI - it's The Father of Maykr belief, the one responsible for their creation. How it came to be VEGA is something only Samuel Hayden might know about... and he isn't telling.
• Do Androids Dream?: Right before VEGA is about to overheat, just as the Doom Slayer makes a backup, VEGA tells Samuel Hayden that he has "many regrets". This is the first and only time he shows anything resembling a train of personal thought.
• Fatal Flaw: As the Father, he is a genuinely compassionate and benevolent being. The problem is that he could be too compassionate, having refused to kill the Dark Lord because he cared for him too much; this and the Slayer's Sympathy for the Devil is what saves Samur's life as well. Though as it turns out, the story about how he refused to kill the Dark Lord isn't quite the truth.
• Foreshadowing: Doom (2016) notes that "it is rumoured that VEGA's core is powered by a piece of arcane technology found near the Argent Fracture." Come Eternal it's revealed he is in fact the lost A.I. god of the Maykrs.
• Gender-Blender Name: Vega is normally presented as a girl's name, but this VEGA has a masculine voice.
• God's Hands Are Tied: The Father requires his life sphere to gain a physical form and purge Urdak from demonic corruption... the same life sphere the Doom Slayer crushed in his hands during the events of The Ancient Gods Part 1. The Slayer invokes this trope once he decides on his final plan to stop demonkind forever, as he knows that the Father likely would have done what he could to stop him from killing the Dark Lord had he been able to use his full power.
• God Is Good: As the Father, he is very kind, compassionate, and loving. He rules the cosmos with both justice and compassion, with endless love for even his most wayward of creations. Though in a twisted sense, this leads into God Is Flawed; The Father is too nice, and a lot of the tragedies in the franchise could have been avoided if he has simply killed the Dark Lord. The second half of The Ancient Gods DLC subverts this, as he was never the Top God who created the multiverse - he stole the Father's power and title.
• God Was My Copilot: VEGA, an incredibly advanced AI who serves as the Mission Control for the first half of Eternal, turns out to be the creator of the observable multiverse. Or rather, an impostor who took the title for himself.
• Heroic Sacrifice: Once in both games, though neither take.
  • Allows the Doom Slayer to destroy him in order to open a portal to The Well so he can shut it down.
  • In Eternal, he does it again, creating an exit portal from Urdak back to Earth as demons overrun the entire Maykr realm.
• I Cannot Self-Terminate: Which makes sense — VEGA is just an AI with no limbs or otherwise physical means of destroying his own neural processors, or blowing up his cooling tanks. Even so, he dutifully directs the Doom Slayer to do these things fully aware that these actions would destroy him.
• I Regret Nothing: Subverted. Right before VEGA completely melts down, he says "I have many regrets", presumably for playing a part in the UAC's monstrous activities as well as his past failures as the Father, or as The Ancient Gods Part 2 suggests, his actions as the false Father.
• Love Is a Weakness: A major part of why every crappy thing in the series happened was because he was too kind and compassionate to kill the Dark Lord, still loving him to the point he decided to seal him and the demons away instead of wiping them out. The result was the Dark Lord's kind growing more and more corrupt until they became demons, who proceeded to start invading and destroying other worlds on their quest for immortality, all while The Father did nothing because of his love preventing him from harming them. Or at least, that's what the Maykrs and Seraphs want people to believe about him.
• Literal Split Personality: As the Father, he ordered Samur to remove his life sphere and hide it in Ingmore's Sanctum. This divided his spirit and mind, with his spirit as the Father remaining in the Sphere, while his mind became VEGA, which allowed him to continue to watch over Earth without drawing attention from the Dark Lord.
• Meaningful Name: Vega is the name of one of the brightest stars in the sky, which is used to navigate the world at night. In this game, VEGA serves as the Doomslayer's guide and companion.
• Messianic Archetype: Is this for the franchise, serving as the Top God and numerous times older than the very universe. Samur is his right-hand man, stating that in gaining physical form again, "he will save us all". His second coming ultimately leads to naught once the Doom Slayer betrays them both, crushing the Father's life sphere and dooming him to never take form in the physical realm ever again. The Ancient Gods Part 2 eventually reveals he is deliberately built up as one by Samur, having been chosen by the Maykrs and Seraphs to wield the power they stole from the real Father they betrayed.
• Mysterious Past: In 2016, VEGA is an artificial intelligence that was supposedly created by the UAC, but the exact details were unspecified. It's notable given VEGA is Samuel's equivalent of a personal right-hand man. In Eternal, when he's plugged into the mainframe of Urdak, the Maykr homeworld, he asks if he's "The Father", referring to the seeming god that the Maykrs had followed before its mysterious disappearance. It's not until The Ancient Gods DLC the truth about his identity and backstory is revealed.
• Not Quite Dead:
  • The Doom Slayer makes a backup of him before going through with destroying him.
  • In Eternal he stays behind on Urdak as demons overrun it, only to come back in The Ancient Gods DLC.
• Rank Scales with Asskicking: As the Father, he was the creator of the multiverse as well as the one who originally defeated the Dark Lord aeons ago. Even with the revelation he was actually an impostor who usurped Father's power and title, that doesn't make him any less powerful back before he departed the physical realm.
• Reality Warper: He created entire realities even before he became self-aware, his very presence when he settled down for a bit created Urdak. Even with the revelation that he stole fractions of the real Father's power, he is still bonafide a god who can restructure a realm like Urdak to his whim.
• Reasonable Authority Figure: As The Father, he's the one figure of any real power the Slayer will at least hear out. This is probably helped by the fact that he shows no intention of stopping the Slayer from carrying out his mission. That being said, the Slayer is aware that his compassion would shoot them both in the foot once he decides to kill the Dark Lord, as the Father would do what he could to stop his creations from killing each other.
• Robot Buddy: To the Doom Slayer, as of Eternal. While VEGA lacks a physical body, he's nothing but helpful and cordial towards the Slayer, serves as mission control, and sometimes teases him in a playful way (such as asking the Slayer if he wants him to disable to safety protocols of the Wave-Motion Gun the Slayer is trying to fire).
• Satan Is Good: He turns out not to be the real Father, but instead gained the title when he overthrew Davoth, the actual creator of the multiverse, and rewrote the universe's creation story accordingly. Despite that, by the end it's pretty clear he, not Davoth, is the more benevolent of the two, as he shows a degree of regret for his past actions.
• The Smart Guy: VEGA comes up with all the ways you can improve your suit and weapons.
• Stupid Good: His Fatal Flaw as the Father was his inability to let go of his compassion for Davoth, resulting in him sealing Davoth away instead of outright killing him and preventing the events of the series. However, it turns out that he couldn't kill Davoth because he isn't the actual Father.
• Time Abyss: Let's put this into perspective: Davoth, the Dark Lord of Hell, was one of the first Primeval the Father created. After an untold amount of time, Davoth threatened reality in his search for Immortality and the Father removed his life sphere and deprived him of physical form. That was at least a decillion years ago; for those unaware, that number has 33 zeroes after the 1. And the Father is even older than him. The Father isn't just older than our own universe: he's likely older than the entire multiverse. However, in The Ancient Gods Part Two with The Reveal of him being Davoth's creation, their actual ages may just be the other way around.
• Token Good Teammate: To the UAC. Samuel Hayden is a Well-Intentioned Extremist who was willing to sacrifice everything (including his own employees) for "the betterment of mankind", and Olivia Pierce turned out to be a Not-So-Well-Intentioned Extremist whose sole drive was to obtain godlike power. VEGA, on the other hand, is thoroughly polite and patient with the Doom Slayer and performs a Heroic Sacrifice to stop Olivia (albeit with the Doom Marine's help). It stems from its nature as the Father, an immeasurably compassionate creator who doesn't want any of his creations to be destroyed.
• Top God: As The Father, he created many universes and other gods. The Ancient Gods Part 2 subverts this to hell and back however, as it was revealed he was actually a creation of Davoth, and that the latter was the real Top God all along until his betrayal at the hands of Maykrs and Seraphs.
• The Usurper: As it turns out in Ancient Gods Part Two, he isn't The Father; Davoth is. The Maykrs, who were creations of Davoth to find Immortality, deemed him a threat to existence and secretly betrayed him, sealing the realm of Jekkad and taking most of Davoth's godly power. They then used that power to ascend one of their own as the Father, then scrubbed and rewrote their history to hide the truth that they betrayed their creator.
• Walking Spoiler: Vega? Oh, he's just a very advanced and very Benevolent A.I., right? No! Seriously, his identity is one of the biggest spoilers in the franchise.
• Wham Line: Twice in Eternal, both times throwing its entire purpose in the plot on its head.
  • In the base game:
    VEGA: Am I... the Father, Dr. Hayden?
  • In the final fight with the Dark Lord in The Ancient Gods - Part 2:
    VEGA: [Davoth] is the first being...and my creator. When he fell, I ascended.

Dr. Abraham Peters

The protagonist of Doom VFR. A scientist for the UAC who had been protected from the initial wave of demonic energy that Olivia unleashed, only to be torn apart by a Pinky after stepping off an elevator. However, a top-secret UAC protocol caused his consciousness to be digitized, allowing him to download himself into a combat-ready chassis and get to work containing the demonic presence.

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• Brain Uploading: The first man since Samuel Hayden to undergo the process.
• Bullet Time: Can alter his perception and reactions to slow down time around him.
• Came Back Strong: Doesn't get much stronger than going from a throwaway corpse set-piece to pulling off feats of demon-slaying almost on par with the Slayer.
• Dual Wielding: Can utilize a full arsenal in his right hand, and a grenade launcher in the left.
• Early-Bird Cameo: Peters actually appeared in Doom (2016) ahead of VFR, as the upper half of a corpse that the Slayer had to pick up to access the BFG.
• Heroic Mime: Averted; Dr. Peters muses to himself on a semi-consistent basis about what he has to do next.
• One-Man Army: Though he doesn't take on odds quite as heavy as the Doom Slayer, he proves his mettle by fighting through the forces of Hell on his own terms, eventually taking on a long-thought-lost prototype of the Cyberdemon to acquire its Argent Accumulator.
• "Shaggy Dog" Story: Just after closing the portal as he had intended, Samuel Hayden overrides his access to the combat body and deletes his consciousness for "causing problems".
• Tele-Frag: His substitution for Glory Kills; once an enemy is staggered, he can lock onto their position and teleport into them to instantly gib them.
• Teleport Spam: Capable of this due to a special feature of his combat body.
• Unskilled, but Strong: While he's a mere scientist with at most a few minutes of virtual training to acclimate himself to his new body, that body is of a combat cyborg and contains a plethora of features to augment his more strategically-inclined mindset.

UAC Spokeswoman

Voiced by: Jeannie Tirado

A holographic woman who actively supports the demonic invasion of Earth, spewing Pro-Hell propaganda and encouraging mankind to roll over and die for their new masters.

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• Ambiguously Human: It's unclear if she's supposed to be some kind of AI or a human cultist who made some pre-recorded lines for general broadcast (though the fact she seems aware of current events suggests against the latter). Considering the unholy tide of supernatural phenomena ravaging the Earth by this point, she may even be Haunted Technology.
  • One ARC broadcast indicates ARC has undercover operatives within the Demonic Cult, implying that the Cult faction of the UAC somehow still has some untransformed human members. Thus, the Spokeswoman may simply be an ordinary Quisling.
• Bad Is Good and Good Is Bad: "Remember, no one is born a sinner. You have to work to achieve success."
• Dissonant Serenity: Is relentlessly cheerful when describing the horrifying "benefits" the demons offer to mankind. Even when she openly taunts people for putting their faith in the Doom Slayer, she sounds more teasing than overly snide.
• Faux Affably Evil: Is cheery, polite and snarky, as she calls for humanity to die screaming at the hands of Hell itself, sometimes while gloating about how no one is coming to save them. It's far more clear in Eternal, when there is no reason to even pretend that the UAC have anything in mind but selling Earth to the demons, and gets more and more evident over the course of that game.
• Political Overcorrectness: She says it's rude to call The Legions of Hell "demons" and that you should call them "mortally challenged." Amusingly, the demons themselves seem to use this terminology, or at least the ones operating under the authority of the UAC Cult and Deag Priests do. Indeed, even the unambiguously Anti-Demon ARC News agency defaults to this term (at least until the end of the game).
• Right for the Wrong Reasons: As part of her 'Demons are our friends' shtick, she spouts several lines about how people should accept the demons because they aren't so different from humans. It comes off as Political Overcorrectness, but given how demons are humans tortured past the Despair Event Horizon, she is technically correct.
  Spokeswoman: There is no 'they', for 'they' are 'us', and 'we' are 'they'.
  Spokeswoman: Evolution is our destination, when they arrive, we arrive.
• The Quisling: She's not shy about playing favourites for the demons.
• Tokyo Rose: Her entire purpose is to spout pro-demonic propaganda at the remnants of humanity.
• Understatement: When the Doom Slayer arrives on Earth to destroy the Super Gore Nest, she remarks to potential passers-by that "you might notice a slight change in the environment." You're immediately treated to a ruined city filled with lava, giant tentacles, and Meat Moss.
• Villainous Breakdown: Finally snaps when the Doom Slayer is closing in on the Icon Of Sin, screaming out of desperation and frustration at the demons present to kill him.
• What Happened to the Mouse?: She's never heard from again after her last Villainous Breakdown, barring canned dialogue.

ARC

In General

A lance of ARC soldiers being led by Samuel

A global military crisis-relief initiative formed by the Allied Nations to combat the Hell invasion, the Armored Response Coalition fought hard to protect Earth against the demonic hordes, but are on the brink of collapse by the start of Doom Eternal.

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• The Alliance: Made up of the militaries of every surviving nation-state.
• Badass Army: While ultimately failing as noted below, they put up a considerable fight for decades against the Hell invasion.
• Defector from Decadence: The ARC's technological backbone is made up of UAC assets that have not fallen to demonic corruption, not least of which is Dr. Samuel Hayden himself.
• Fun with Acronyms: Armored Response Coalition.
• Humongous Mecha: The ARC built several building-sized mechs to combat the demons; you can find their wrecks strewn all across the first level.
• La Résistance: They are formed from Earth's defence forces ravaged by Hell's armies.
• Meaningful Name: Fitting that Earth's last defence against the demonic tide until the Doom Slayer returned was amply named The ARC.
• Oh, Crap!: The near-entirety of the ARC staff on board the carrier in The Ancient Gods Pt. 1 decide to pull a swift evacuation once they see that the Doom Slayer hasn't brought the Father's life sphere back, but the Dark Lord's. Far as they know, it's the End of the World as We Know It the instant they realize this. The only person that sticks around is the Intern below.
• Redshirt Army: They may have fought bravely, but it's made starkly clear that the ARC's forces are ultimately no match for the armies of Hell. The one time you see anything of the ARC that isn’t corpses and derelict mechs, it’s their headquarters in the middle of being completely overrun.
• United Nations Is a Superpower: The Codex states that the Allied Nations functions as basically a single world government.
• Voice of the Resistance: The Doom Slayer can listen to ARC broadcasts which provide information and news to survivors scattered across Earth.

The Intern

Voiced by: AJ LoCascio

A worker for the ARC, first seen in the ARC Complex. He is one of the few not afraid of the Doom Slayer, being a fan. He reappears in The Ancient Gods Pt. 1 as part of the staff on the ARC Carrier.

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• Ascended Fanboy: He is utterly ecstatic to meet the Doom Slayer and gladly aids him where he can. Up to and including taking over as Mission Control at the midpoint of The Ancient Gods Pt. 1.
• Asian and Nerdy: An unapologetic fanboy of the Slayer and intelligent enough to operate the ARC Carrier systems by himself after the rest of the ARC crew evacuates after the Slayer brings the Dark Lord sphere onboard.
• Establishing Character Moment: He is introduced fanboying over the Slayer, in stark contrast of literally everyone else that isn't Samuel Hayden, VEGA, The Khan Maykr and the Marauders. The thing that set him apart from the ones beside his admiration is the fact that he's just a Ridiculously Average Guy by comparison.
• The Everyman: About the only remarkable thing is that he is a fanboy of the Doom Slayer. Otherwise, he's a rather mundane person.
• Hidden Depths: Despite being a Ridiculously Average Guy compared to the Doom Slayer, he is not only one of the very few humans not afraid of his presence (Being more afraid of embarrassing himself before the Doom Slayer than anything). He's also the only one among the cast who quickly figured out what the Doom Slayer was actually planning to do when he brought back the life sphere of the Dark Lord instead of that of the Father and was fully on board with it in hopes that summoning and then killing the Dark Lord would destroy all Demons outside of Hell, even taking over as Mission Control for the rest of the DLC.
• Leaning on the Fourth Wall: He notices on the second Ancient Gods Pt. 1 mission that the Slayer's objective display changed from "Retrieve the Father's life sphere" when he's still in the ARC facility, to "Destroy The Father's life sphere" and has a bit of trepidation at first as he points this out. Probably why he wasn't exactly surprised in the aftermath.
• Mission Control: Takes over this role just as the Slayer goes to the Blood Swamps in The Ancient Gods: Part One and fully acts as this during The Ancient Gods: Part Two, sharing the role with the Father.
• Nerves of Steel: Very casual even after learning The Doom Slayer plans to destroy The Father’s Life Sphere and resurrect the Dark Lord to properly destroy him for good. A plan that is very risky.
• Nice Guy: A pretty chill, friendly dude who will help humanity battle the demons.
• No Name Given: He's just known as "The Intern".
• Oh, Crap!: Averted. He's the only one to not react with fear upon the Slayer's presence. He also completely understands why he brought the Dark Lord's essence onto the carrier and is fully on board with his plan. The only time he reacts with even mild concern about the Slayer's actions is when he realizes that the Slayer intends to destroy the Father's life sphere rather than work for the gods any longer, and even then he quickly goes along with it.
• What Happened to the Mouse?: The Doom Slayer loses contact with him right before the Final Boss in The Ancient Gods - Part 2 and he’s never seen or heard from, again.

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