- "They" (Star Control)
- 'Owon
- 'Zangian
- 2I's species
- 3-Eyed Alien (3-2-1 Penguins!)
- 3-Eyed Alien (Arthur)
- 3-Eyed Alien (The Loud House)
- 333
- 61 Cygni Native
- @At
- A'askvarii
- A't'trr
- A-440's Species
- A-Chiltarian
- AAnn
- ASPF
- ASW:Classifications
- ASW:List of Needed Articles
- ASW:Policy Amendments
- ASW:Rules and Policies
- ASW:Sandbox
- Aaamazzarite
- Aakon
- Aalagar
- Aamaarazan
- Aandrisk
- Aar'aa
- Aaris
- Aaroun
- Aatheriexa
- Aawkwaard
- Ab'Ugartte
- Ab-human
- Abaddon's Species
- Aballonian
- Abbai
- Abductor (Invader Zim)
- Abductor (Star Trek)
- Abednedo
- Abinyshi
- Ablat's Species
- Abomination (Fallout)
- Abomination (Resistance)
- Abominor
- Above
- Abronian
- Abyormenite
- Abyssin
- Abzorbalovian
- Acamarian
- Acanti
- Acceptor
- Accipiptero
- Achaia
- Achernonian
- Achivar
- Achom
- Acid Lizard
- Ackdarian
- Acklay
- Acquaran
- Acrobatic Fish
- Acrosian
- Actuary Class
- Adam's Species (The Twilight Zone)
- Adarian
- Adarnian
- Adder Moss
- Adinian
- Adipose
- Adjezezii
- Admiral B'tang's species
- Adnerem
- Adorian
- Adosian Slug
- Adumbrali
- Advanced Hybrid
- Advent
- Advozse
- Aedian
- Aefan
- Aegenan
- Aelfar
- Aeluri
- Aemt
- Aenar
- Aeolian (K9)
- Aeolian (Lost in Space)
- Aeon
- Aeosian
- Aepox
- Aerophibian
- Aerophyte
- Aesdherian
- Aesir (Freespace)
- Aesiri (Roswell Conspiracies)
- Aether Drake
- Aetherian
- Aethersteed
- Af'El Lion
- Affytechan
- Aganof
- Agee
- Agellae
- Agent X's Species
- Aggedor
- Aggle-ack
- Aggoron
- Aggressiveness Level
- Aggrocrab
- Agi Jabi
- Agletsch
- Agolian Blob
- Agon Bearerpod
- Agorffi
- Agorrian
- Agr
- Agrax Goat
- Agusa
- Ahak Maharr
- Ahamkara
- Ahannu
- Ahimsa
- Ahra Naffi
- Aihai
- Aileen's Species
- Ailon
- Ailoprobe
- Aing-Tii
- Air Elemental
- Air Hammer
- Air Whale
- Airam
- Airborne Algae Sack
- Airlandian
- Airsquid (Alien Legion)
- Airsquid (Star Wars)
- Airthorn
- Aiwha
- Ajisa
- Ak'Haireth
- Akaali
- Akadi
- Akata
- Akela
- Aki-Aki
- Akiridion
- Akk Dog
- Akkabarran
- Akko Grain
- Akl-bing
- Akman
- Akoszonam
- Akrennian
- Akrennian Beetle
- Akrid
- Akrida
- Aksellan
- Akul
- Akurian
- Akwin
- Al Packa
- Alabamian
- Alabyew
- Aladnean
- Alain
- Alamite
- Alarevi
- Alashan
- Alata Nimos
- Alazhi
- Albeniz
- Albinor
- Alcazar's Species
- Alcidian
- Alcoon
- Aldebaran (Bucky O'Hare)
- Aldebaran (Zagubieni)
- Aldebaran Bat-leopard
- Aldebaran Beidafang
- Aldebaran Eel
- Aldebaran Gopher
- Aldebaran Mantis
- Aldebaran Mud Leech
- Aldebaran Serpent
- Aldebaran Shellmouth
- Aldebaranian
- Aldebarian Wheat Grass
- Aldereenian
- Aldore's Humanoid
- Aleena
- Alex from Galax' Species
- Alfa 177 canine
- Alflololian
- Alfur
- Algernon (Spore)
- Algolian (Of All Possible Worlds)
- Algolian (Star Trek)
- Algor
- Algorian Mammoth
- Alibar
- Alien (12 to the Moon)
- Alien (A Centaur's Life)
- Alien (A Close Encounter with a Strange Kind)
- Alien (A Walk in the Dark)
- Alien (Alien Abduction, 2005)
- Alien (Alien Apocalypse)
- Alien (Alien Hunter)
- Alien (Alien Opponent)
- Alien (Alien Outpost)
- Alien (Alien Simulator)
- Alien (Aliens: Earth Angel)
- Alien (Aliens: Incubation)
- Alien (Aliens: Taste)
- Alien (Aliens vs. Parker)
- Alien (Allegiance)
- Alien (American Warships)
- Alien (Animal Crossing: The Movie)
- Alien (Apollo 18)
- Alien (Assimilate)
- Alien (Attack the Block)
- Alien (Back at the Barnyard)
- Alien (Bad Taste)
- Alien (Bart's Not Dead)
- Alien (Battle: Los Angeles)
- Alien (Bermuda Tentacles)
- Alien (Bermuda Triangle)
- Alien (Body Bags)
- Alien (Chicken Little)
- Alien (Close Encounters of the Third Kind)
- Alien (Corporate Monster)
- Alien (Dexter's Laboratory)
- Alien (Dino Run)
- Alien (Dinosaurs vs. Aliens)
- Alien (Dissension)
- Alien (Earth 21)
- Alien (Earth vs. the Flying Saucers)
- Alien (Everything You Know is Wrong)
- Alien (Fantasy)
- Alien (Ferocious Planet)
- Alien (Final Days of Planet Earth)
- Alien (Fine Tuning)
- Alien (Fire in the Sky)
- Alien (Frost Giant)
- Alien (Gadget and the Gadgetinis)
- Alien (Garfield)
- Alien (Grand Theft Auto V)
- Alien (H. G. Wells' War of the Worlds)
- Alien (Heatstroke)
- Alien (Hellboy)
- Alien (High Plains Invaders)
- Alien (Horror Express)
- Alien (Hulu)
- Alien (Hybrids)
- Alien (I Married a Monster from Outer Space)
- Alien (Inseminoid)
- Alien (It Came from Outer Space)
- Alien (Jeff and Some Aliens)
- Alien (Laserblast)
- Alien (Latent Image)
- Alien (Life of Brian)
- Alien (Lost Tapes)
- Alien (Love is the Plan the Plan is Death)
- Alien (Mammoth 2006)
- Alien (Monsters)
- Alien (Mr. Wuffles!)
- Alien (My Best Friend Is Invisible)
- Alien (Night Skies)
- Alien (Night of the Blood Beast)
- Alien (Oculus Dreamdeck)
- Alien (Parents from Space)
- Alien (Plan 9 from Outer Space)
- Alien (Proximity)
- Alien (Reactor)
- Alien (Red Dead Redemption 2)
- Alien (Redemption Trail)
- Alien (Riverworld, 2003)
- Alien (Scooby-Doo and the Ghoul School)
- Alien (Shaun the Sheep)
- Alien (Sherman's Lagoon)
- Alien (Siberia 56)
- Alien (Signal Simulator)
- Alien (Signs)
- Alien (Space Center)
- Alien (Spielberg's War of the Worlds)
- Alien (SpongeHenge)
- Alien (Star Runners)
- Alien (Stowaway)
- Alien (Taken)
- Alien (Teenagers from Outer Space)
- Alien (The 27th Day)
- Alien (The Adventures of Tintin)
- Alien (The Ambassadors of Death)
- Alien (The Chameleon)
- Alien (The Darkest Hour)
- Alien (The Envoy)
- Alien (The Forgotten)
- Alien (The Garfield Show)
- Alien (The Gracefield Incident)
- Alien (The Green Slime)
- Alien (The Hive)
- Alien (The Hum)
- Alien (The Invasion of the Scooby Snatchers)
- Alien (The Little Prince, 2015)
- Alien (The Man from Planet X)
- Alien (The Mr. Men Show)
- Alien (The Muppet Show)
- Alien (The Screwfly Solution)
- Alien (The Trollenberg Terror)
- Alien (Thirst)
- Alien (Threshold)
- Alien (Tolle Sachen)
- Alien (Turnabout Is Fair Play)
- Alien (UFO)
- Alien (Voyager-19)
- Alien (Welcome to Camp Nightmare)
- Alien (When Aliens Attack)
- Alien (Xtro 3: Watch the Skies)
- Alien (You'll Never Go Home Again)
- Alien (Youth)
- Alien (Zenon: The Zequel)
- Alien (Zig & Sharko)
- Alien (Zombies 3)
- Alien 3000
- Alien Agents (The Arrival, 1996)
- Alien Bear (Naughty Bear)
- Alien Bear (Savage Planet)
- Alien Benefactors' Species
- Alien Bira
- Alien Brain
- Alien Bunny
- Alien Cockroach
- Alien Didi
- Alien Dragon (Dragon City)
- Alien Drone (They Came Again)
- Alien Duck
- Alien Entity (Arma 3: Contact)
- Alien Filmcrew Member's Species
- Alien Green Six-legged Lizard (Futurama)
- Alien Groupie
- Alien Grunt
- Alien Hominid
- Alien Horse
- Alien Jackal
- Alien Lion
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