Alien



While there is some evidence of the existence of Extra-Terrestial life forms, it is very scarce. Until events of the Fallout 3 add-on, Mothership Zeta there was no record of direct contact between humanity and the creatures.

The Brotherhood of Steel and Shi have encountered the bodies of alien life forms or their spaceships, as did the pre-War United States government, which kept its alien specimens mostly in Area 51. By extension the Enclave and Brotherhood Outcasts also have access to alien technology; Alien Power Cells can be found at Fort Independence and in the armory of the Enclave's Mobile Base Crawler.

Crashed ships
Two alien ships are known to have crashed in the United States, with a possible third: The alien at the crash site appears on the ground outside of its cockpit, the almost spherical window of which is shattered. Judging by the green goo (blood, presumably) inside the helmet, it is reasonable to assume that the alien died of some sort of head injury, likely from its skull breaking against the inside of its helmet upon impact, seeing as how the helmet itself is still intact. Shortly before arriving at the alien's crashed ship, the player will pick up a mysterious radio signal called Recon Craft Theta Beacon. It appears that the alien either released a distress signal shortly before its untimely death or the ship itself sent out the signal automatically to seek aid.
 * Alien Ship in California
 * Recon Craft Theta in Capital Wasteland (Fallout 3)
 * An alien ship can explode over the head of the Lone Wanderer in the Capital Wasteland during a special encounter although the cause of the catastrophe is unknown. Regardless, the wreckage contains an ample supply of Alien Power Cells and the unique Alien Blaster, Firelance.
 * Possibly, you will discover a dead alien in a special encounter.

Alien technology

 * Alien Blaster - a weapon of alien origin.
 * Firelance - a unique variant of the Alien Blaster,(Fallout 3).
 * Alien Power Cell - the power source for the Alien Blaster (Fallout 3).
 * According to its own (potentially unreliable) records, the Skynet computer was created based partly on alien technology (Fallout 2).

Appearances
Crashed alien ships appear in Fallout and Fallout 3. Alien Blaster appears in Fallout, Fallout 2 and Fallout 3. Aliens also appear and abduct the player in the Fallout 3 add-on, Mothership Zeta.