By extension, the Capital Wasteland Brotherhood of Steel have a moderate amount of alien power cells kept in the Citadel's armory and the Brotherhood Outcasts also have some alien power cells at Fort Independence. The Brotherhood of Steel around 2161 and the Shi around 2241 encountered the bodies of aliens or their spaceships. The Pre-War Olney Powerworks stored alien power cells near their tesla coil research. Even toy manufacturers such as Wilson Automatoys weren't immune to these accusations and the United States government, which was said to keep its alien specimens and technology mostly in Area 51 (like a flying saucer that was later recaptured by aliens but crashed in California, instantly killing the two pilots). Sources suggest that many of the Enclave's more advanced weapons and robotic systems were based on alien technology. But after the mysterious disappearance, or rather abduction, of the USSA space capsule Clarabella 7 and the pilot astronaut Colonel Hartigan during the 1960s Space Race suspicions arose, and in 2062 the existence of aliens became internally recognized by government analysts, even though to the general public their existence was still covered up and believed only by 'crackpot' groups such as the Quaere Verum.

For the majority of this time, aliens were unknown to humanity and the realm of science fiction.

The zetans' interactions with Earth date back centuries before the Great War, but it is unknown if the other species also visited around this time or came later. The only known purpose of the zetans is implied to be experimentation and study on human subjects.

Fallout 4 abduction mod