Lieutenant

The Lieutenant of the Master's Army (sometimes called Lou Tenant, or simply Lou ) is the right hand of the Master and the commander of the Mariposa Military Base.

Background
The Lieutenant is the model super mutant, being 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.

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.

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

Abilities
The Lieutenant is noticeably tougher and smarter than standard super mutant soldiers. He has about 250 HP, and is equipped with a Gatling laser. He has several cybernetic augmentations (including a bionic eye), and also appears to be wearing metal armor custom-made for his super mutant bulk. During the battle, he is aided by Van Hagan and two heavily armed super mutant commanders (plus, some robobrains that can intervene and strike the Vault Dweller from behind).

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. Lou and Van Hagan need to die in order to obtain the key.

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 the player being dipped 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 Van Hagan and the Lou concerning their imminent discovery of Vault 13. This is worth 1500 experience points.

Death animation

 * Killing the Lieutenant will trigger a unique death animation:

Appearances
The Lieutenant appears in Fallout as a talking head. He is seen briefly in the intro for Fallout 2. He is indirectly referenced in Fallout: New Vegas and mentioned in its add-on Dead Money by Dog. He is also mentioned in the Fallout Bible.