List of fictional alien species: A

Name	Source	Type
Aaamazzarite	Star Trek: The Motion Picture	Hairless humanoids that create objects biochemically from their mouths; also known as Therbians
Aalaag	Gordon R. Dickson's Way of the Pilgrim
Abh	Crest of the Stars	Genetically-enhanced humans
Abductors	Invader Zim, Squee
Abzorbalof	Doctor Who	Human-absorbing humanoid
Abyormenites	Hal Clement's Cycle of Fire	floating balloons
Acamarian	Star Trek
Acquarans	Farscape	Humanoid
Adipose	Doctor Who	Tiny, round humanoids made of fat
Advent	Sins of a Solar Empire	Humanoid
Advents (aka Uranus or the Creators)	Guyver: The Bioboosted Armor
Aenar	Star Trek	Telepathic humanoid
Aeodronians	Battlelords of the 23rd Century
Aerophibian	Ben 10	Manta 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.
Affront	Iain M. Banks' Excession
Agorian	Ratchet & Clank
Akaali	Star Trek
Akiss	Harry Turtledove's Worldwar series	Very large and dangerous reptilian animal in the mythology of the Race. It is comparable to Earth's mythical dragons.
Akrennians	Titan 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.
Akritirians	Star Trek
Albategna	The webcomic Not So Distant	Large black-and-white creatures with six tentacular limbs (two for walking and four for manipulating)
The Alien	Satyajit Ray's The Alien and Banku Babu's Friend
Alien	The Hidden and its sequel	Parasitic and having the capability to possess its host
Alien Sex Goddesses	Church of the SubGenius
Alkari	Master of Orion
Allasomorph	Star Trek
Amaut	C. J. Cherryh's Alliance-Union universe
Altarians	Galactic Civilizations	Humanoid
Amazonians	Futurama	Giant humanoid women. Men of this species have died out.
Amnioni	Stephen Donaldson's The Gap Cycle	Humanoid
Amorphs	Schlock Mercenary
Anabis	The Voyage of the Space Beagle by A. E. van Vogt
Ancients	Farscape
Ancients	Freespace	Technologically advanced beings that were wiped out several thousand years ago. Unknown physical description.
Ancient	Stargate SG-1	Humans from Earth, with a developed intelligence, who in the age of the creation of the pyramids, left Earth for universe exploration.
Andalites	K. A. Applegate's Animorphs	Centaur-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
Andorians	Star Trek	Humanoid with blue skin, white hair, antennae
Andromeni	Battlelords of the 23rd Century
Angol Mois	Sgt. Frog
Angosian	Star Trek
Annari	Star Trek	Humanoid
Anodite	Ben 10	Free-spirited humanoid energy beings from the planet Anodyne, who can draw life from the mana around them. Old enough Anodites can use this manipulate reality, while even younger ones have a strong connection to magic.
Antarans	Master of Orion II	Marauders exiled to a pocket dimension
Antarians	Imperium Galactica II: Alliances
Antedeans	Star Trek
Anterians	The Suite Life on Deck & Cocoon.
Anticans	Star Trek
The Anti-Monitor	DC Comics
Appoplexian	Ben 10	Muscular 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.
Aqualish	Star Wars
Aquatoids	X-COM: Terror from the Deep
Arachnichimp	Ben 10	Four-eyed, four-armed monkey-like aliens from the jungle planet Arahnascimmia, they have the ability to produce strong webbing from their tails.
Arachnids	Battlelords of the 23rd Century
Arachnoids	Serious Sam: The First Encounter	Scorpion-like
Aras	Perry Rhodan
Arbryls	Ascendancy
Arburian Pelarota	Ben 10	Functionally 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
Arcadians	Star Trek
Arceans	Galactic Civilizations
Arcturians	Star Trek
Argolin	Doctor Who	Humanoid
Arilou Lalee'lay	Star Control	Humanoid - 'Grey' alien
Arisians and Eddorians	E. E. Smith's Lensman novels
Ark Megaforms	Noon Universe
Arkonides	Perry Rhodan
Armada of Annihilation	Axelay
Arquillians	Men in Black
Airlia	Area 51 novel series by Robert Doherty	Humanoid, see moai
Arnor	Galactic Civilizations II: Dread Lords
Asari	Mass Effect	Blue-skinned feminine humanoids
Aschen	Stargate SG-1	Humanoid
Asgard	Stargate SG-1	Grey humanoid
Aslan	Traveller RPG	Feline humanoid
Asuran	Stargate Atlantis
Atavus	Earth: Final Conflict	Humanoid
Atevi	C. J. Cherryh's Foreigner series	Tall, 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.
Aurelians	Advent Rising
Autobot	Transformers	A machine race that can transform between a humanoid form and that of a certain machine, depending on the specific Autobot
Auronar	Blake's 7
Autons	Doctor Who	Living plastic beings
Axanars	Star Trek
Axons	Doctor Who
Azathoth	Cthulhu Mythos
Azgonians	Perry Rhodan
Aziam	Battlelords of the 23rd Century
Azwaca	Harry Turtledove's Worldwar series	A 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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