List of fictional alien species: A

NameSourceType
AaamazzariteStar Trek: The Motion PictureHairless humanoids that create objects biochemically from their mouths; also known as Therbians
AalaagGordon R. Dickson's Way of the Pilgrim
AbhCrest of the StarsGenetically-enhanced humans
AbductorsInvader Zim, Squee
AbzorbalofDoctor WhoHuman-absorbing humanoid
AbyormenitesHal Clement's Cycle of Firefloating balloons
AcamarianStar Trek
AcquaransFarscapeHumanoid
AdiposeDoctor WhoTiny, round humanoids made of fat
AdventSins of a Solar EmpireHumanoid
Advents (aka Uranus or the Creators)Guyver: The Bioboosted Armor
AenarStar TrekTelepathic humanoid
AeodroniansBattlelords of the 23rd Century
AffrontIain M. Banks' Excession
AgorianRatchet & Clank
AkaaliStar Trek
AkissHarry Turtledove's Worldwar seriesVery large and dangerous reptilian animal in the mythology of the Race. It is comparable to Earth's mythical dragons.
AkrenniansTitan A.E.Rat/hyena-like humanoids who apparently do not dream (or bathe much); the character Preed is an Akrennian. The food "Akrennian Beetle Sushimi" is also featured in the film, hinting that insect-like life-forms are also found on their home planet.
AkritiriansStar Trek
AlbategnaThe webcomic Not So DistantLarge black-and-white creatures with six tentacular limbs (two for walking and four for manipulating)
The AlienSatyajit Ray's The Alien and Banku Babu's Friend
AlienThe Hidden and its sequelParasitic and having the capability to possess its host
Alien Sex GoddessesChurch of the SubGenius
AlkariMaster of Orion
AllasomorphStar Trek
AmautC. J. Cherryh's Alliance-Union universe
AltariansGalactic CivilizationsHumanoid
AmazoniansFuturamaGiant humanoid women. Men of this species have died out.
AmnioniStephen Donaldson's The Gap CycleHumanoid
AmorphsSchlock Mercenary
AnabisThe Voyage of the Space Beagle by A. E. van Vogt
AncientsFarscape
AncientsFreespaceTechnologically advanced beings that were wiped out several thousand years ago. Unknown physical description.
AncientStargate SG-1Humans from Earth, with a developed intelligence, who in the age of the creation of the pyramids, left Earth for universe exploration.
AndalitesK. A. Applegate's AnimorphsCentaur-like, with non-poisonous scorpion tails, and blue fur
AndoriansStar TrekHumanoid with blue skin, white hair, antennae
AndromeniBattlelords of the 23rd Century
Angol MoisSgt. Frog
AngosiansStar Trek
AnoditeBen 10 Alien Force
AntaransMaster of Orion IIMarauders exiled to a pocket dimension
AntariansImperium Galactica II: Alliances
AntedeansStar Trek
AnteriansThe Suite Life on Deck
AnticansStar Trek
The Anti-MonitorDC Comics
AqualishStar Wars
AquatoidsX-COM: Terror from the Deep
ArachnidsBattlelords of the 23rd Century
ArachnoidsSerious Sam: The First EncounterScorpion-like
ArasPerry Rhodan
ArbrylsAscendancy
Arburian PelarotaBen 10
ArcadiansStar Trek
ArceansGalactic Civilizations
ArcturiansStar Trek
ArgolinDoctor WhoHumanoid
Arilou Lalee'layStar ControlHumanoid - 'Grey' alien
Arisians and EddoriansE. E. Smith's Lensman novels
Ark MegaformsNoon Universe
ArkonidesPerry Rhodan
Armada of AnnihilationAxelay
ArquilliansMen in Black
AirliaArea 51 novel series by Robert DohertyHumanoid, see moai
ArnorGalactic Civilizations II: Dread Lords
AsariMass EffectBlue-skinned feminine humanoids
AschenStargate SG-1Humanoid
AsgardStargate SG-1Grey humanoid
AslanTraveller RPGFeline humanoid
AsuranStargate Atlantis
AtavusEarth: Final ConflictHumanoid
AteviC. J. Cherryh's Foreigner seriesTall, dark, mysterious humanoids. Culture progresses rapidly from steam-age to contemporary and beyond perhaps due to their numerological language. Assassin's Guild rather than police.
AureliansAdvent Rising
AutobotTransformersA machine race that can transform between a humanoid form and that of a certain machine, depending on the specific Autobot
AuronarBlake's 7
AutonsDoctor WhoLiving plastic beings
AxanarsStar Trek
AxonsDoctor Who
AzathothCthulhu Mythos
AzgoniansPerry Rhodan
AziamBattlelords of the 23rd Century
AzwacaHarry Turtledove's Worldwar seriesA large stock animal native to Home and used by the Race as food. They are also edible to humans. The Colonization Fleet brought azwaca and several other species of livestock to Tosev 3 (Earth). As Earth plants were not equipped to deal with the extremely economic grazing patterns of these animals, some ecological damage resulted. This in turn led to diplomatic tensions between the Race and the various human powers that shared borders with Lizard-territory.
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