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
AerophibianBen 10Manta ray-like humanoids from the misty planet Aeropela, who can fly and swim at supersonic speeds, accelerate to speeds greater than light, and shoot neuroshock blasts from their eyes and tails to disable a victim's nervous system.
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 aliens, they have non-poisonous scorpion tails as a formidable weapon. They lack mouths, so they use a technique called "thought-speak", similar to but not quite telepathy, and they have four eyes: two on their face, and two on stalks that give them 360 degree vision. They are the main enemies of the villainous Yeerks
AndoriansStar TrekHumanoid with blue skin, white hair, antennae
AndromeniBattlelords of the 23rd Century
Angol MoisSgt. Frog
AngosianStar Trek
AnnariStar TrekHumanoid
AnoditeBen 10Free-spirated humanoid energy beings from the planet Anodyne, who can draw life from the mana around them.
AntaransMaster of Orion IIMarauders exiled to a pocket dimension
AntariansImperium Galactica II: Alliances
AntedeansStar Trek
AnteriansThe Suite Life on Deck & Cocoon.
AnticansStar Trek
The Anti-MonitorDC Comics
AppoplexianBen 10Muscular tiger-like humanoids from the planet Apploplexia. They value emotional openness, but this can be a problem since their primary emotion is rage, and they are proud fighters. Primarily, they use claws on their wrists that elongate when their rage increases, but are skilled in wrestling, though are fatally vulnerable to certain high pitched noises.
AqualishStar Wars
AquatoidsX-COM: Terror from the Deep
ArachnichimpBen 10Four-eyed, four-armed monkey-like aliens from the jungle planet Arahnascimmia, they have the ability to produce strong webbing from their tails.
ArachnidsBattlelords of the 23rd Century
ArachnoidsSerious Sam: The First EncounterScorpion-like
ArasPerry Rhodan
ArbrylsAscendancy
Arburian PelarotaBen 10Functionally extinct due to the destruction of their home planet Arburia, they are bulky yellow aliens that can curl into a ball, much like a pillbug, and are very hard to damage in ball form, and they use this to crush enemies either by bouncing around or rolling over them
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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