The Vault - Fallout Wiki

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The Vault - Fallout Wiki
FO01 NPC Lieutenant N.png
Biography and appearance
RaceCybernetic Mariposa super mutant
RoleOverseer of Mariposa Military Base
Right-hand of the Master
LocationMariposa Military Base
Dialogue FileLT.MSG
Mentioned inFallout: New Vegas
Dead Money
QuestsDestroy the source of the Mutants.
SPECIALStrength: 10
Perception: 8
Endurance: 10
Charisma: 4
Intelligence: 8
Agility: 7
Luck: 6
Derived StatsHit points: 250
Armor class: 37
Action points: 8
Carry weight: 275
Unarmed damage: 5
Melee damage: 19
Sequence: 16
Healing rate: 3
Experience points: 1500
Normal DT/DR: 10/60%
Laser DT/DR: 10/70%
Fire DT/DR: 10/60%
Plasma DT/DR: 8/40%
Electrical DT/DR: 8/40%
EMP DT/DR: 15/50%
Explode DT/DR: 10/50%
Tag SkillsBig Guns: 92%
Energy Weapons: 92%
Unarmed: 121%
Melee Weapons: 111%
Throwing: 71%
Proto id00000023 (Super Mutant Lieutenant)
00000145 (Super Mutant Lieutenant)
ActorTony Jay
Gametitle-FO1.pngGametitle-FNV DM.png
Gametitle-FO1.pngGametitle-FNV DM.png
The Super Mutant is the next advancement in human evolution. To save the world, we will convert all the worthy individuals. Simple, efficient, glorious.
— Lieutenant

The Lieutenant of the Master's Army[1] (sometimes called Lou Tenant,[2] or simply Lou,[3] by the less mentally capable men under his command) is the right hand of the Master and the commander of the Mariposa Military Base.[4]


The Lieutenant is the model super mutant: Faster, tougher, and more intelligent than standard humans. He was the strongest of his batch, capable of withstanding the regimen of the FEV transformation without losing his intellect and skills (possibly even receiving an increase). His transformation created a sense of religious awe in him, focused on the Master and the Unity. He became his most devoted follower, supporting his master's ideals and firmly believing that the super mutants shall inherit the earth. For his devotion, he was rewarded with the highest position in the army, cybernetic implants, and personalized equipment.[5][6][4] The Lieutenant is unlike any other super mutant in this aspect: He bears the pauldrons of what apparently is power armor, has an eye prosthetic and cerebral implants, and what seems to be an apparatus pumping his body full of stabilizing drugs, to contain the severe viral overdose contained within that would otherwise cause his body to tear itself apart.[7]

In terms of personality, the Lieutenant is further unlike any other mutant. Soft spoken, urbane, and well read, his firm belief in the superiority of super mutants borders on conceit. Yet he believes it is simple honesty, for the super mutants are truly better adapted to the demands of the post-nuclear world.[8][9][4]

Yet for all his intelligence and refinement, there are darker sides to the Lieutenant's personality. Though he considers torture crass, he finds it only satisfying. Unlike regular sadists, he does not employ it needlessly, especially if he can obtain the knowledge through normal coercion.[10][4]


The Lieutenant ultimately perished, though whether he fell at the hands of the Vault Dweller or died in the destruction of Mariposa remains unknown.[11]

Interactions with the player character

Interactions overview

Perk empathy synthesizer.png
This character is involved in quests.


  • Destroy the source of the Mutants.: The Lieutenant is an optional encounter on the fourth level of Mariposa. He provides information on the Master's plans and can be killed to ensure his demise. Killing him will allow the player to pilfer his locker, which contains the nuke key that can be used to unlock the nuclear bomb console beneath the Cathedral.

Other interactions

  • Harry will take the Vault Dweller to the Lieutenant if they allow him to. The Lou will then interrogate the Vault Dweller concerning the location of their Vault. Divulging it will lead to dipping and conquest of Vault 13.
  • Sneaking up on the Lieutenant (simply coming near his room will suffice) allows the Vault Dweller to overhear a conversation between VanHagan and the Lou concerning their imminent discovery of Vault 13. This is worth 1500 experience points.
  • Killing the Lou will trigger an unique death animation:
Lou's death animation

Tell me about

Lou's Tell-me-abouts
Query Response
Unity The Unity is the goal of all Super Mutants. Through the FEV virus, we will bring all of humanity together in peace.
FEV The FEV virus was discovered by the Master many years ago. It is what makes us the Chosen Ones. But you will soon learn that, I assure you.
Master The Master is father to us all.
Cathedral Nothing but a device to further our plans. No matter, all humans will be Chosen...or dead.
Vats The Vats are where the FEV is stored, and where you normals become one of us. Of course, some die horrible, excruciatingly painful deaths, but well, those are the breaks.
Normals They are humans who have not been exposed to radiation. They tend to fare better in the Vats than others. You are a perfect example of this.
Vaults They were constructed before the war. They are also our main source of Prime Normals.
Morpheus Morpheus. It's quite amusing. He thinks he's so much more than just a slug the Master recruited to head his Children of the Cathedral nonsense. Ah, well. He, too, will be dipped in the Vats and he'll probably die a horrible death...I hope.
Virus The FEV virus was discovered by the Master many years ago. It is what makes us the Chosen Ones. But you will soon learn that, I assure you.
None of the above That question is irrelevant to the Unity.
I won't even dignify that with an answer.


Icon armored vault suit.png
Assault carbine icon.png
Gatling laser
Icon briefcase.png
Carried items
Icon male severed head.png
Drops on death



The Lieutenant appears only in Fallout and mentioned in the Fallout: New Vegas add-on Dead Money. In Fallout: New Vegas, during G.I. Blues, Roy and Wayne will have an exchange where the former corrects the latter that the attackers called their leader Lieutenant, not Lou Tenant, and state that the boy can be "dumber than a mutant."


  1. 1.0 1.1 Lieutenant's character description: "{100}{}{You see the Lieutenant of the Master's army.}"
  2. Harry: "{177}{Harry301}{He Lou Tenant. He my boss. Not tell him, but Harry could take on good day.}"
  3. Harry: "{155}{Harry_23}{Ummm...yes. You prime normal. The Lou will be happy. Take away, take away.}"
  4. 4.0 4.1 4.2 4.3 Fallout Official Survival Guide p.102: "The Lieutenant: The Master's Right-Hand Mutant"
    "Think of an urbane and well-educated college professor who has become the very essence of evil incarnate. He is highly intelligent, and is second-in-command to the Master himself. He genuinely believes that the super-mutants and the Unity are the future of the planet, and will do anything to see them succeed. His attitude toward the player, at least at first, will be amused and curious; humans, from his point of view, are less than insects, good only for the Vats, or for being crushed. He will interrogate the player to learn about the Vault, but along the way he can be induced to speak at length about the Master, the Unity, Morpheus and the Children of the Cathedral, and the FEV virus that causes the mutations."
  5. The Vault Dweller: ""
    Lieutenant: "{167}{LIEUT21}{Fate. Luck of the draw. I was the strongest of my batch to be dipped in the virus, and I have always supported the ideals of the Unity and the Master, for he is right. And for my devotion, I have been rewarded.}"
  6. Fallout Bible 5
    "7. Just a question about the LuietantQuoted verbatim, error appeared in the original sourceIcon sic.png from Fallout 1, was he a Brotherhood soldier that got dipped? Or was he just a mutant that got lucky and scored himself some nice armour (that looks a lot like PA) - Stainless
    He's a human that got lucky when he was dipped and managed to keep his intelligence (or possibly, got greater intelligence). As for armor and weapons, yeah, he lucked out, especially with that gatling laser. :)"
  7. Death animation.
  8. The Vault Dweller: ""
    Lieutenant: "{139}{LIEUT11}{The Super Mutant is the next advancement in human evolution. To save the world, we will convert all the worthy individuals. Simple, efficient, glorious.}"
  9. The Vault Dweller: "{171}{}{So where is this Master?}"
    Lieutenant: "{173}{LIEUT23}{He's busy with the Children of the Cathedral. They actually consider us gods. But then, who can blame them.}"
    The Vault Dweller: "{174}{}{My, aren't we conceited?}"
    Lieutenant: "{176}{LIEUT24}{Is honesty conceit? We're the next step in evolution. Through our Unity, the world will survive. Where is the conceit in that?}"
  10. The Vault Dweller: ""
    Lieutenant: "{209}{LIEUT36}{Feel better now? Since torture is such a crass, yet oddly satisfying and effective technique, I'll ask you once more nicely. Where . . . is . . . the Vault!}"
  11. Fallout events.