Aliens are an extraterrestrial yellowish-green-skinned humanoid race from an unknown planet. The only thing known about them is that they use their ability to travel space to study other planets and species.
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It is not known from what system and what planet they come. They have orbited and observed the Earth with two motherships (Zeta and an unnamed one) at least since the 1600s in the Solar System, but humans had no real awareness of them and no evidence of their existence. Before the 1960s, only “crackpot” groups such as Quaere Verum believed in them, thinking that aliens existed but that evidence of their existence was covered up by a government conspiracy.
But after the mysterious disappearances (abducted by aliens in Zeta in fact) of the USSA space capsule Clarabella 7 and the pilot, astronaut Colonel Hartigan, during the 1960s Space Race, the aliens became nationally recognized. It is said that alien technology was the basis of many of the Enclave’s more exotic and impressive weaponry and robotics. Toy manufacturers such as Wilson Automatoys weren’t immune to these suspicions. The pre-War United States government was said to keep its alien specimens and technology mainly in Area 51 (such as a flying saucer that was later re-captured by aliens, but crashed in California probably during a flight sometime after the Great War, instantly killing the two alien pilots).

The Brotherhood of Steel1 around 2161 and the Shi2 around 2241 have encountered the bodies of aliens or their spaceships. By extension, the Capital Wasteland Brotherhood of Steel have 72x alien power cells in the Citadel’s armory3 and the Brotherhood Outcasts also have some alien power cells at Fort Independence. Also before 2277, an alien body was discovered in Fort Bannister,4 probably by the Enclave, carrying what may have been recovered (like an alien blaster and some alien power cells) in the armory of the Mobile Base Crawler at Adams Air Force Base.

Some advanced human technologies were created by using alien technology, such as the AI project number 59234, created in the 2050s, which manages the entire Sierra Army Depot Skynet, the device blocking telepathic and psychic commands, the psychic nullifier5 and probably the advanced accelerated organic tissue regeneration processes gel mostly used for brain bots (robobrain, humanoid brain bot, think tank), and the bio med gel developed at the Boulder Dome.

Aliens are diminutive, yellowish-green-skinned humanoids that possess green blood. Their bodies are elongated, small-chested, lean and lacking in muscular definition. Their legs are shorter and jointed differently from a normal humanoid. Their limbs are also proportionally different than a normal humanoid; their humerus and thighs are the same lengths as their forearms and shins.
Their heads are unusually large in proportion to their bodies. They have no hair on their head, or anywhere on the body, and no noticeable external ears or noses, but only small openings or orifices for ears and nostrils. They have very small and very large mouths, no teeth, a light green tongue and large opaque black eyes with no discernible iris or pupil. Their hands have only 3 long fingers and lack opposable thumbs, but the fingers are long and flexible enough to wrap around objects and manipulate them as other humanoid species do with their thumbs. They seem to breathe a similar atmosphere that humans do and subsist on a diet of unknown worm and squid food.

They seem to have a strict society focused on work and progress, with no apparent concern for hobbies and personal pursuits. Their architecture is spartan and purely functional – for instance, their bed (called a stasis chamber) is a sterile metal capsule with no mattress, blankets, sheets, or other pieces of bedclothes typically found in a normal human bed, and no discernible means of entertainment can be seen aboard Zeta. However, the aliens, in their own right, appear to have some degree of emotion since alien workers display obvious fear when confronted with armed assailants. In another notable case, the aliens are shown to have an unusual fascination with Giddyup Buttercup, as demonstrated in a captive recorded log onboard Zeta, of Sally being taken to the recording room and noticing a Giddyup Buttercup. She notes that upon her calling attention to it, the aliens become very excited, though she has no idea why they act this way.
They view other species as laboratory animals, worthy of preservation and storage at best and vivisection and experimentation at worst. They speak in their own language of high-pitched screeches and wails. As such, communication between humans and aliens is impossible. This isn’t helped by the fact that, barring recording some brief biographical information, the aliens simply aren’t interested in discussion.

They are incredibly advanced in their various technological fields, capable of spaceflight and technological feats equal to and often beyond that of even the most advanced human pre-War technology. They also possess technologies such as long-term cryostasis, powerful rayguns, genetic manipulation, teleportation and holograms. However, they are totally dependent on technology. Because of this they are physically fragile, lacking in raw strength, and ineffective in melee-based combat. Very few possess especially protective armor and clothing.

Aliens typically wear spacesuits, the color of the suit apparently indicating rank, and soldiers generally carry shock batons, disintegrators and atomizers. They prefer to attack their foes in large numbers, and tend to have guardian drones with them.


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