A Database of Fictional Extraterrestrials Space Aliens

Aaamazzarite (Star Trek)
Aalaag (Gordon R. Dickson's Way of the Pilgrim)
Abh (Crest of the Stars)
Abydonians (Stargate SG-1)
Abyormenites (Hal Clement's Cycle of Fire)
Acamarian (Star Trek)
Acquarans (Farscape)
Adipose (Doctor Who)
Advents (aka Uranus or the Creators) (Guyver)
Aenar (Star Trek)
Aeodronians (Battlelords of the 23rd Century)
Affront (Iain M. Banks' Excession)
Akaali (Star Trek)
Akritirians (Star Trek)
The Alien (Satyajit Ray's The Alien and Banku Babu's Friend)
Alkari (Master of Orion)
Allasomorph (Star Trek)
Amaut (C. J. Cherryh's Alliance-Union universe)
Altarians (Galactic Civilizations)
Amnioni (Stephen Donaldson's The Gap Cycle)
Amorphs (Schlock Mercenary)
Anabis (The Voyage of the Space Beagle by A. E. van Vogt)
Ancients (Farscape)
Ancients (Stargate SG-1)
Andalites (K. A. Applegate's Animorphs)
Andorians (Star Trek)
Andromeni (Battlelords of the 23rd Century)
Androsynth (Star Control)
Angol Mois (Sgt. Frog)
Angosians (Star Trek)
Annihilus (Marvel Comics)
Antarans (Master of Orion II)
Antarians (Imperium Galactica II: Alliances)
Antedeans (Star Trek)
Anticans (Star Trek)
The Anti-Monitor (DC Comics)
Aqualish (Star Wars)
Aquatoids (X-COM: Terror from the Deep)
Arachnids (Battlelords of the 23rd Century)
Aras (Perry Rhodan)
Arbryls (Ascendancy)
Arburian Pelarota (Ben 10)
Arcadians (Star Trek)
Arceans (Galactic Civilizations)
Arcturians (Star Trek)
Argolin (Doctor Who)
Arilou (Star Control)
Arisians and Eddorians (E. E. Smith's Lensman novels)
Ark Megaforms (Noon Universe)
Arkonides (Perry Rhodan)
Arnor (Galactic Civilizations II: Dread Lords)
Asari (Mass Effect)
Aschen (Stargate SG-1)
Asgard (Stargate SG-1)
Aslan (Traveller RPG)
Asurans (Stargate Atlantis)
Atavus (Earth: Final Conflict)
Atevi (C. J. Cherryh's Foreigner series)
Aurelians (Advent Rising)
Autobot (Transformers)
Auronar (Blake's 7)
Autons (Doctor Who)
Axanars (Star Trek)
Axons (Doctor Who)
Azgonians (Perry Rhodan)
Aziam (Battlelords of the 23rd Century)
Baalols (Perry Rhodan)
Babel fish (The Hitchhiker's Guide to the Galaxy)
Badoon (Marvel Comics)
Bailies (Cleopatra 2525)
Bajorans (Star Trek)
Ba'kus (Star Trek)
Baliflids (Ascendancy)
Ballchinnian (Men in Black II)
Balmarians (Super Robot Wars)
Bandersnatchi (Larry Niven's Known Space)
Bandi (Star Trek)
Banik (Farscape)
Banthas (Star Wars)
Barkonides (Perry Rhodan)
Barzans (Star Trek)
Beings of the Extra Terrestrial origin which is Adversary of human race (Muv-Luv)
Benjari (Battlelords of the 23rd Century)
Benzites (Star Trek)
Berellians (Star Trek)
Berserkers (Fred Saberhagen's Berserker series)
Berubelans (Anachronox)
Betazoid (Star Trek)
Bgztlans (DC Comics' Legion of Super-Heroes)
Bionicles (Bionicle)
Bioroids (Intense Stories)
Bith (Star Wars)
Bjorn (Space Quest)
Black Arms (Shadow the Hedgehog)
Black Cloud (Fred Hoyle)
Black Oil (The X-Files)
Blastaar (Marvel Comics)
Blisk (Destroy All Humans! 2)
Bolians (Star Trek)
Boolite (Farscape)
Borg (Star Trek)
Bothans (Star Wars)
Braalians (DC Comics' Legion of Super-Heroes)
Bradicor (Schlock Mercenary)
Brains (The Adventures of Jimmy Neutron: Boy Genius (Win, Lose and Kaboom))
Breen (Star Trek)
Bricker (Star Trek)
Briori (Star Trek)
Brood (Marvel Comics)
Brunnen G (LEXX)
Brunali (Star Trek)
Brutes (Jiralhanae) (Halo)
Budong (Farscape)
Bugs from Klendathu (Starship Troopers)
Bulrathi (Master of Orion)
Buggers (Ender's Game series)
Bynars (Star Trek)
Caitians (Star Trek: The Animated Series)
Calamarain (Star Trek)
Caleban (Frank Herbert's Whipping Star)
Calcinites (X-COM: Terror from the Deep)
Caliban (C. J. Cherryh's Alliance-Union universe)
Capelons (Ascendancy)
Caponians (Zak McKracken and the Alien Mindbenders)
Cardassians (Star Trek)
Carggites (DC Comics' Legion of Super-Heroes)
Carrionites (Doctor Who)
Cathar (Star Wars)
Cat People (Marvel Comics)
Catalytes (Utopia)
Catteni (Anne McCaffrey's Catteni Series)
Cavaliers (Tommy PJ)
Celareon (Conquest: Frontier Wars)
Celatids (X-COM: UFO Defense)
Celestials (Marvel Comics)
Centauri (Babylon 5)
Centrans (Christopher Anvil's Pandora's Planet stories)
Ceti eels (Star Trek II: The Wrath of Khan)
Chaethe (Kathy Tyers's One Mind's Eye)
Chalnoths (Star Trek)
Chamachies (Ascendancy)
Changelings (Star Trek)
Chaos (Independence War, aka I-War, and Independence War 2: Edge of Chaos)
Charrids (Farscape)
Chatilians (Battlelords of the 23rd Century)
Cheblons (Imperium Galactica II: Alliances)
Cheela (Dragon's Egg)
Chelonians (Doctor Who novels)
Chenjesu (Star Control)
Chevanno (Utopia)
Chi (C. J. Cherryh's Chanur novels)
Chigs (Space: Above and Beyond)
Chimera (Resistance: Fall of Man)
Chimera Sui Generis (Ben 10)
Chiss (Star Wars)
Chmmr (Star Control)
Cho-choi (Jack McDevitt's Infinity Beach)
Chozo (Metroid)
Chronomyst (Ascendancy)
Chryssalids (X-COM: UFO Defense)
Cicadian (Mark Leach's Marienbad My Love)
Cinnrusskin (James White's Sector General series)
Cirronians (Tracker)
Cizerack (Battlelords of the 23rd Century)
Clairconctlar (Star Control 3)
Clutch Turtles (Liaden universe)
Cocytans (The Dig)
Coeurl (The Voyage of the Space Beagle by A. E. van Vogt)
Cognocenti (Star Trek)
Colatas (Farscape)
Cole (Tracker)
Colonists (The X-Files)
Colour out of space (H. P. Lovecraft)
Coluans (DC Comics' Legion of Super-Heroes)
Combine (Half-Life 2)
Coneheads (Saturday Night Live)
Coola (Cooler) (Dragon Ball Z)
Coreeshi (Farscape)
Corporal Giroro (Sgt. Frog)
Corvallen (Star Trek)
Covenant, The (Halo)
Creators (Nexus: The Jupiter Incident)
Crites (Critters films)
Crypto (Destroy All Humans!)
Cryons (Doctor Who)
Ctarl-Ctarl (Outlaw Star)
Cybermen (Doctor Who)
Cybertronians (Transformers)
Cybyota (Orion's Arm)
Cylons (Battlestar Galactica)
Cynoid (Master of Orion III)
Cyrollan (The Journeyman Project)
Daemonites (Wildstorm)
Dakkamites (Marvel Comics)
Daktaklakpak (Star Control 3)
Daleks (Doctor Who)
The Dance (Marvel Comics)
Dantari (Star Trek: New Frontier)
Darjakr'Ul (Utopia)
Dark Eldar (Warhammer 40,000)
Darloks (Master of Orion)
Darrians (Traveller RPG)
Darzok (Haegemonia: Legions of Iron)
Daxamites (DC Comics)
Decapodian (Futurama)
Decepticon (Transformers)
Deep Ones (H. P. Lovecraft)
Deep Ones (X-COM: Terror from the Deep)
Defiance (Genesis Rising)
Delphons (The History of the Galaxy series)
Deltans (Star Trek)
Delvians (Farscape)
Demiurg (Warhammer 40,000)
Deneans (Farscape)
Denebians (Star Trek)
Deng (Keith Laumer's Bolo series)
Denobulans (Star Trek)
Dentics (Farscape)
Dentrassis (The Hitchhiker's Guide to the Galaxy)
Deoxys (Pokémon)
Dessarians (Tracker)
Detrovite (Ben 10)
Devaronian (Star Wars)
Devastators (One Mind's Eye)
Devilukean (To Love-Ru)
Dilbians (The Law-Twister Shorty and other stories by Gordon Dickson)
Dnyarri (Star Control)
Dom Kavash (Freelancer)
Dominators (DC Comics)
Dominators (Doctor Who)
DomZ (Beyond Good and Evil)
Doog (Star Control 3)
the Doublers (Stanisław Lem's Eden)
Douwd (Star Trek)
Draaknaars (Thor series)
Dracs (Barry B. Longyear's Enemy Mine and The Enemy Papers)
Draconians (Doctor Who)
Draenei (World of Warcraft)
Drahvins (Doctor Who)
Draic Kin (The Longest Journey, Dreamfall)
Drak (Farscape)
Drakh (Babylon 5 Crusade)
Drath (Galactic Civilizations: Altarian Prophecy)
Drayan (Star Trek)
Dread Lords (Galactic Civilizations II: Dread Lords)
Drej (Titan A.E.)
Drengin (Galactic Civilizations)
Drones (Yanme'e) (Halo)
Dronkey (Shrek)
Druuge (Star Control)
Dugs (Star Wars)
Duos from Uranus (Space Patrol (1962))
Dubtaks (Ascendancy)
Durlans (DC Comics' Legion of Super-Heroes)
Duros (Star Wars)
Dyson Aliens (Peter F. Hamilton's )
Ectonurite (Ben 10)
Edo (Star Trek)
Ego the Living Planet (Marvel Comics)
Ekhonides (Perry Rhodan)
El-Aurians (Star Trek)
Eldar (Warhammer 40,000)
Elder Gods (Cthulhu Mythos)
Elder Things (Cthulhu Mythos)
Eldorians (Utopia)
Elerians (Master of Orion II)
Elites (Sangheili) (Halo)
Elitians ()
Engineers (Huragok) (Halo)
Eoladi (Master of Orion III)
Energy Rider (Farscape)
Ep-Hogers (Perry Rhodan)
Eridani (Battlelords of the 23rd Century)
Eschiff (London Wild)
Esmers (Little Big Adventure 2)
E.T (E.T. The Extra-Terrestrial)
Ethereals (X-COM: UFO Defense)
Exobot (Star Trek)
Exquivan (Star Control 3)
Evon (Master of Orion III)
Ewoks (Star Wars)
Face of Boe, The (Doctor Who)
Face Dancers (Dune universe)
Falleen (Star Wars)
Felysians (Noctis)
Fek'Ihri (Star Trek)
Fendahl (Doctor Who)
Ferengi (Star Trek)
Ferronans (Perry Rhodan)
Festival (Singularity Sky by Charles Stross)
Fithp (Larry Niven's Footfall)
Flatcats (Robert A. Heinlein's The Rolling Stones, compare Tribble)
Fleeblebroxians (Chip 'n' Dale's Rescue Rangers)
Floaters (X-COM: UFO Defense)
Flood (Halo)
Florauna (Ben 10)
Fludentri (Ascendancy)
Foamasi (Doctor Who)
Foralbo (Utopia)
Ford Prefect (The Hitchhikers Guide to the Galaxy)
Forerunners (Halo)
Forerunners (The History of the Galaxy series))
The Forest of Cheem (Doctor Who)
Formics (Ender Wiggins cycle by Orson Scott Card)
Fotiallian (Star Trek)
Fott (Battlelords of the 23rd Century)
Frieza (Dragon Ball Z)
Frutmaka (Ascendancy)
F'sherl-Ganni (Schlock Mercenary, also called 'Gatekeepers')
Furbls (Battlelords of the 23rd Century)
Furlings (one of the Four Great Races) (Stargate SG-1)
Furons (Destroy All Humans!)
Futars (Dune universe)
Gadmeer (Stargate SG-1)
Gaim (Babylon 5)
Galactus (Marvel Comics)
Galaxoid (Calvin and Hobbes)
Galvan (Ben 10)
Galvanic Mechomorph (Ben 10)
Gamilons/Gamilus (Space Battleship Yamato/Star Blazers)
Gamorrean (Star Wars)
Gand (Star Wars)
Gaols (Titan A.E.)
Garthlings (David Brin's Uplift Universe)
The Gelth (Doctor Who)
Gemini (Battlelords of the 23rd Century)
Geonosian (Star Wars)
Geth (Mass Effect)
Gethenians (Ursula K. Le Guin's Ekumen stories) and other races)
Ghamans (Perry Rhodan)
Ghosts (Nexus: The Jupiter Incident)
Gigan (Godzilla films)
Gill Men (X-COM: Terror from the Deep)
G'keks (David Brin's Uplift Universe)
Gladifers (Dennis Paul Himes)
Gloarft (Megas XLR)
Gnolams (Master of Orion II)
Gnosis (Xenosaga)
Goa'uld (Stargate SG-1)
Godan (Imperium Galactica II: Alliances)
Gonzo (The Muppets)
Goola-Goola (Battlelords of the 23rd Century)
Gorlocks (Win, Lose and Kaboom)
Gorg (Nexus: The Jupiter Incident)
Gorn (Star Trek)
Goszuls (Perry Rhodan)
Gourmand (Ben 10)
Govorom (Ascendancy)
Gowachin (Frank Herbert's ConSentiency universe))
G.R.A.I.S.E. (Melonpool)
Grans (Star Wars)
The Graske (Doctor Who)
Great Race of Yith (H. P. Lovecraft)
Grendarl (Master of Orion III)
Gretchin/Grotz (Warhammer 40,000)
Greys (popular mythology)
Grogs (Larry Niven's Known Space)
Grudeks (Farscape)
Grue (Pitch Black)
Grunds (Marvel Comics)
Grundos (Neopets)
Grunts (Unggoy) (Halo)
Guardians of the Universe (DC Comics)
Gubru (David Brin's Uplift Universe)
Gungans (Star Wars)
H'Harn (Edmond Hamilton's Star Kings series)
Haggunenons (The Hitchhiker's Guide to the Galaxy)
Halflings (Dances in the Snow, Genome)
Hallessi (Harry Turtledove's Worldwar book series)
Hallucinoids (X-COM: Terror from the Deep)
Halosians (Farscape)
Hangi (Farscape)
Hani (C. J. Cherryh's Chanur novels)
Hanshaks (Ascendancy)
Harammins (The History of the Galaxy series))
Harika (Star Control 3)
Haydonites (Robotech)
Headcrabs (Half-Life)
Headies (Noon Universe)
Heechee (Frederik Pohl)
Herald (Star Control 3)
Hermat (Star Trek)
High Ones (Elfquest)
Hiigarans (Homeworld)
Hirogen (Star Trek)
Hisa (C. J. Cherryh's Alliance-Union universe)
Hivers (Sword of the Stars)
Hivers (Traveller RPG)
Hoka (Poul Anderson and Gordon R. Dickson)
Hooloovoo (The Hitchhiker's Guide to the Galaxy)
Hoon (David Brin's Uplift Universe)
Horda (Doctor Who)
Hork-Bajir (K. A. Applegate's Animorphs)
Horta (Star Trek)
Howard the Duck (Marvel Comics)
Hrossa (C. S. Lewis' Ransom Trilogy)
Hunters (Lekgolo) (Halo)
Hunters (Star Trek)
Hur'q (Star Trek)
Hutts (Star Wars)
Husnock (Star Trek)
Hydrans (Star Trek)
Hykraius (DC Comics' Legion of Super-Heroes)
Hynerians (Farscape)
Iberons (Imperium Galactica II: Alliances)
Ibs (Robert J. Sawyer's Starplex)
Ice Warriors (Doctor Who)
Iconians (Galactic Civilizations II: Dread Lords)
Iconians (Star Trek)
Iduve (C. J. Cherryh's Alliance-Union universe)
Ikrini (Battlelords of the 23rd Century)
Ilanics (Farscape)
Ilwrath (Star Control)
Imsaeis (Master of Orion)
Imskians (DC Comics' Legion of Super-Heroes)
Ing (Metroid Prime 2:Echoes)
Insects (The History of the Galaxy series)
Interions (Farscape)
Invid/Inbit (Robotech: The New Generation and their counterparts from Genesis Climber Mospeada)
Irkens (Invader Zim)
Isanians (Perry Rhodan)
Ishtarians (Poul Anderson's Fire Time)
Ithanites (Star Trek)
Ithkul (Master of Orion III)
Ixtl (The Voyage of the Space Beagle by A. E. van Vogt)
Jaffa (Stargate SG-1)
Jaridians (Earth: Final Conflict)
Jawa (Star Wars)
Jem'Hadar (Star Trek)
Jenova (Final Fantasy 7)
Jezzedaic Priests (Battlelords of the 23rd Century)
Jiralhanae (Halo)
Jjaro (Marathon Trilogy)
J'naii (Star Trek)
Jocaceans (Farscape)
Jotoki (Larry Niven's Known Space)
Joozian (South Park)
Judoon (Doctor Who)
Kadi (Star Trek)
Kafers (2300AD)
Kaleds (Doctor Who)
Kalish (Farscape)
Kal-Kriken (Utopia)
Kalliran (C. J. Cherryh's Alliance-Union universe)
Kambuchka (Ascendancy)
Kanamit (To Serve Man (The Twilight Zone))
Kang and Kodos (The Simpsons)
Karemma (Star Trek)
Kariak (Haegemonia: Legions of Iron)
Kazon (Star Trek)
Kdatlyno (Larry Niven's Known Space)
Kerons (Sgt. Frog)
Key-Guardians (Utopia)
King Ghidorah (Godzilla films)
Kineceleran (Ben 10)
Kharaa (Natural Selection)
Kherubim (Wildstorm)
Khunds (DC Comics)
Khurtarnan (Farscape)
Kif (C. J. Cherryh's Chanur novels))
Kig-yar (Halo)
Kilaaks (Destroy All Monsters)
Kilrathi (Wing Commander games))
Kizanti (Battlelords of the 23rd Century)
Kimera (Earth: Final Conflict)
King Cold (Dragon Ball Z)
Kivar (Roswell)
Klaestron (Star Trek)
Klackons (Master of Orion)
Klingons (Star Trek)
Knnn (C. J. Cherryh's Chanur novels)
Koozbanians (The Muppet Show)
Korath (Galactic Civilizations II: Dark Avatar)
Korbinites (Marvel Comics)
Korx (Galactic Civilizations: Altarian Prophecy)
K-PAXians (K-PAX)
Kra'hen (Imperium Galactica II: Alliances)
Krakeds (Battlelords of the 23rd Century)
Kree (Marvel Comics)
Kreel (Star Trek)
Kreely (Schlock Mercenary)
Kreetassan (Star Trek)
Krenim (Star Trek)
Kriken (Metroid Prime Hunters)
Krith (Richard C. Meredith's 'Timeliner Trilogy')
Krogan (Mass Effect)
Kromaggs (Sliders)
Kroot (Warhammer 40,000)
Krynn (Galactic Civilizations II: Dark Avatar)
Krynn (The Journeyman Project 2: Buried in Time)
Krynoids (Doctor Who)
Kryptonians (Superman)
Kssthrata (Schlock Mercenary)
K'tang (Star Control 3)
Ktarian (Star Trek)
Kymellians (Marvel Comics)
Kymnar (FTL:2448 RPG)
Kyo (C. J. Cherryh's Foreigner series)
Kyulek (O.R.B: Off-World Resource Base)
Kzinti (Larry Niven's Known Space series and Star Trek: The Animated Series)
Lallorans (DC Comics' Legion of Super-Heroes)
Lance Corporal Dororo (Sgt. Frog)
Laxidasians (Marvel Comics)
Lectroids (The Adventures of Buckaroo Banzai Across the Eighth Dimension)
Leerans (K. A. Applegate's Animorphs)
Lekgolo (Halo)
Leoniders (Noon Universe)
Lepidopterran (Ben 10)
Leviathan (Farscape)
Liir (Sword of the Stars)
Limax (Ben 10)
Lipul (Star Trek)
Lithians (James Blish's A Case of Conscience)
Livrai (Joe Haldeman's Mindbridge)
Lk (fungi type alien) (Star Control 3)
Loboan (Ben 10)
Lobster Men (X-COM: Terror from the Deep)
Locust (Gears of War)
Logrians (The History of the Galaxy series)
Lohvo (Sluggy Freelance)
Lombaxes (Ratchet Clank)
Loomi (Space Patrol)
Lucratians (Utopia)
Luminoth (Metroid Prime 2: Echoes)
Lunarians (Final Fantasy IV)
Lurian (Star Trek)
Lurmans (Doctor Who)
Luxans (Farscape)
Ly-Cilph (The Night's Dawn Trilogy)
Lycocians (Star Trek)
Lyrans (Star Fleet Universe)
M-113 Creature (Star Trek)
Macra (Doctor Who)
Magog (Andromeda)
Mahendo'sat (C. J. Cherryh's Chanur novels)
Maians (Perfect Dark)
Majat (C. J. Cherryh's Alliance-Union universe)
Malons (Star Trek)
Mangalores (The Fifth Element)
Mantis (Conquest: Frontier Wars)
Marklars (South Park)
Marmosians (Ascendancy)
Martians (H. G. Wells' The War of the Worlds)
Martians (Edgar Rice Burroughs's Barsoom series)
Martians (Marvin the Martian from Looney Tunes and Duck Dodgers)
Martians (Premendra Mitra's Mangalbairi (The Martian Enemies))
Martians (Ray Bradbury's The Martian Chronicles)
Martians (Aelita (1924 movie))
Martians (Mars Attacks (Topps trading cards) and Mars Attacks! (Tim Burton movie))
Martians (Quatermass and the Pit)
Martians (Larry Niven's Known Space)
Martian Manhunter (DC Comics)
Masters (The Tripods)
Mazians (Battlelords of the 23rd Century)
Mebes (Ascendancy)
Medusans (Star Trek)
Meehooks (Fusion comic book series)
Meklars (Master of Orion)
Melconians (Keith Laumer's Bolo series)
Melmacians (ALF)
Melnorme (Star Control)
Melotians (Melonpool)
Menoptra (Doctor Who)
Mentors (Doctor Who)
Merseians (Technic History by Poul Anderson)
Mesklinites (Hal Clement's Mission of Gravity)
Methorians (Barrington J. Bayley's Zen Gun)
Metroid (Metroid series)
Metrons (Star Trek)
Microman (Microman)
Minbari (Babylon 5)
Minions (Ascendancy)
Minosians (Star Trek)
Mintakans (Star Trek)
Miradorn (Star Trek)
Misha (Battlelords of the 23rd Century)
Mmrnmhrm (Star Control)
Mon Calamari (Star Wars)
Mondoshawan (The Fifth Element)
Monoids (Doctor Who)
The Mooninites (Aqua Teen Hunger Force (individually: Igninokt and Err))
Mork (Mork and Mindy)
Morlocks (H. G. Wells' The Time Machine)
Morlocks (Larry Niven's Known Space)
Moroks (Doctor Who)
Mor-Taxans (War of the Worlds (TV series - first season))
Morthren (War of the Worlds (TV series - second season))
Movellans (Doctor Who)
Moxx of Balhoon (Doctor Who)
Mri (C. J. Cherryh's Faded Sun trilogy)
Mr. Saturn (EarthBound)
Mrrshan (Master of Orion)
Mudokons (Oddworld series)
Mutons (X-COM: UFO Defense)
Mutzachans (Battlelords of the 23rd Century)
Muuh (Orion's Arm)
Mycon (Star Control)
The Mysterons (Captain Scarlet and the Mysterons)
Naglon (Doctor Who)
Nairnama (Independence War, aka I-War)
Namekian (Dragon Ball)
Narn (Babylon 5)
Nausicaans (Star Trek)
Neadlehead (Win, Lose and Kaboom)
Nebari (Farscape)
Nebular (Calvin and Hobbes)
Necris (Unreal tournament)
Necrons (Warhammer 40,000)
Nemet (C. J. Cherryh's Alliance-Union universe)
Nephilim (Wing Commander: Prophecy)
Neptunians (Futurama)
Neutrals (Futurama)
New Gods (The Fourth World in DC Comics)
New Orions (Master of Orion III)
Nicassar (Warhammer 40,000)
Niea (Niea 7)
Nietzscheans (Andromeda)
Nihilanth (Half-Life)
Nimbuloids (Ascendancy)
N'Kull (Advent Rising)
Nitros Oxide (Crash Bandicoot series)
Nodulians (Tracker)
Nomads (Freelancer)
Nomes (Terry Pratchett's The Bromeliad)
Nommo (Master of Orion)
Nox (Stargate SG-1)
Nyronds (passim in the works of Zander Nyrond; occasionally in those of his )
Oans (DC Comics)
Oannes (Babylonian mythology)
Oankali (Octavia Butler's Xenogenesis series)
Ob'enn (Schlock Mercenary)
Ocampa (Star Trek)
Oculons (Ascendancy)
Ogri (Doctor Who)
Ogrons (Doctor Who)
Old Ones (Warhammer 40,000)
Omicronians / Popplers (Futurama)
Ood (Doctor Who)
Optera (Doctor Who)
Orandoans (DC Comics' Legion of Super-Heroes)
Orfa (Ascendancy)
Organians (Star Trek)
Ori (Stargate SG-1)
Orion (Star Trek)
Orion Rogues (Battlelords of the 23rd Century)
Orions (Master of Orion)
Orkans (Mork and Mindy)
Orks (Warhammer 40,000)
Orsians (Tracker)
Ortheans (Mary Gentle's Golden Witchbreed)
Ortog (Star Control)
Orz (Star Control)
Outsiders (Larry Niven's Known Space)
Overlords (Childhood's End by Arthur C. Clarke)
Owa (Star Control 3)
Paan'uri (Schlock Mercenary)
Pah Wraith (Star Trek)
Pak, a.k.a. Protectors (Larry Niven's Known Space books)
Pakled (Star Trek)
Parillatians (Utopia)
Pascalenes (Utopia)
Pascians (Battlelords of the 23rd Century)
Peliar Zel (Star Trek)
Pemalites (K. A. Applegate's Animorphs)
Pequeninos (Orson Scott Card's Speaker for the Dead)
Petrosapien (Ben 10)
Pfifltrig (C. S. Lewis' Ransom Trilogy)
Pfhor (Marathon Trilogy)
Phagors (Brian W. Aldiss's Heliconia series)
Phalanx (Marvel Comics)
Phentari (Battlelords of the 23rd Century)
Phibians (Dune universe)
Phleebhutinskis (Space Quest)
Phtagurs (Metabarons)
Pierson's Puppeteers (Larry Niven's Ringworld and Known Space series)
Pilots (Farscape)
Pinkunz (Space Quest)
Pisciss Volanns (Ben 10)
Pkunk (Star Control)
Ploxis (Star Control 3)
Porquinhos (Orson Scott Card's Speaker for the Dead)
Posleen (John Ringo's )
tans (The High Crusade)
Predator aliens (Predator movie series)
Primes (Peter F. Hamilton's )
Private Tamama (Sgt. Frog)
Progenitors (David Brin's Uplift Universe)
Prophets (San 'Shyuum) (Halo)
Prophets (Star Trek)
Proteans (AdventureQuest)
Protheans (Mass Effect)
Protoss (StarCraft)
Psilons (Master of Orion)
Psychlos (Battlefield Earth)
Psychons (Space: 1999)
Dremer (Gene Brewer's K-PAX)
Protoculture (Macross series)
Polionation Tech (Sims 2)
The Puppet Masters (Robert A. Heinlein book of the same name)
Purple Aliens (It's Walky!)
Pyronite (Ben 10)
Pyroviles (Doctor Who)
Python Lizards (Battlelords of the 23rd Century)
Q (Star Trek)
Quarks (Doctor Who)
Quarren, a.k.a. (Star Wars)
Quintaglio (Robert J. Sawyer)
Quintesson (Transformers)
Qou'thalas (The Journeyman Project 3: Legacy of Time)
Quarians (Mass Effect)
Qwardians (DC Comics)
Raas (Master of Orion III)
Rabotevs (Harry Turtledove's Worldwar book series)
Race, The (Moreau Series)
The Race (Harry Turtledove's Worldwar book series)
Rachni (Mass Effect)
Rako-Gorda (Utopia)
Ram Pythons (Battlelords of the 23rd Century)
Rancors (Star Wars)
Raptors (Nexus: The Jupiter Incident)
Raxacoricofallapatorians (Doctor Who)
Re'ol (Stargate SG-1)
Reapers (Doctor Who)
Reapers (X-COM: UFO Defense)
Reapers (Mass Effect)
Regul (C. J. Cherryh's Alliance-Union universe)
Relgarians (Farscape)
Remans (Star Trek)
Replicators (Stargate SG-1)
Re'tu (Stargate SG-1)
Rigellians (Simpsons) (including Kang and Kodos) (The Simpsons)
Rigellians (Lensman books)
Riim (The Voyage of the Space Beagle by A. E. van Vogt)
Rills (Doctor Who)
Rimerunner (Expedition)
Risa (Star Trek)
Robotech Masters (Robotech)
Rodians (Star Wars)
Roger the Alien (American Dad)
Romulans (Star Trek)
Rull (The War against the Rull by A. E. van Vogt)
Rutans (Doctor Who)
Ryqril (Timothy Zahn's The Blackcollar)
Saiyan (Dragon Ball Z)
Sakkra (Master of Orion)
Sal-Kadeem (Utopia)
Salarians (Mass Effect)
Sandworm (Dune universe)
Sangheili (Halo)
San 'Shyuum (Halo)
Sariens (Space Quest)
Sarturians (Utopia)
Sau-Bau (Battlelords of the 23rd Century)
Scarrans (Farscape)
Schniarfeurs (Valérian and Laureline)
Scorvians (Farscape)
Scrin (Command Conquer)
Sebaceans (Farscape)
Second through Last Men (Olaf Stapledon's Last and First Men)
Sectoids (X-COM: UFO Defense)
Seekers (Advent Rising)
Selay (Star Trek)
Seraphim (Supreme Commander)
Sergeant Keroro (Sgt. Frog)
Sergeant Major Kururu (Sgt. Frog)
Séroni (Space Trilogy)
Shadows (Babylon 5)
Shalka (Doctor Who)
Sharrh (C. J. Cherryh's Alliance-Union universe)
Sheeda (Grant Morrison's Seven soldiers of Victory megaseries)
Sheliak (Star Trek)
Shevar (Ascendancy)
Sheyangs (Farscape)
Shi'ar (Marvel Comics)
Shinari (Imperium Galactica II: Alliances)
Shingouz (Valérian comics)
Shivans (Descent: FreeSpace — The Great War)
Shoggoths (H. P. Lovecraft)
Shofixti (Star Control)
Shonunin (C. J. Cherryh's Alliance-Union universe)
Shroobs (Mario Luigi: Partners in Time)
Silacoids (X-COM: UFO Defense)
Silicoids (Master of Orion)
Silver Surfer (Marvel Comics)
Skaarj (Unreal (series))
Skedar (Perfect Dark)
Skinnies (Starship Troopers)
Skolarians (Zak McKracken and the Alien Mindbenders)
Skrulls (Marvel Comics)
Slavers (see Thrint) (Larry Niven's Known Space)
Slitheen (Doctor Who)
Sludge (Ben 10)
Slylandro (Star Control)
Snakemen (X-COM: UFO Defense)
Snarks (Marvel Comics)
Snotlings (Warhammer 40,000)
Snovemdomas (Ascendancy)
Solaris (Stanisław Lem's Solaris)
Solomon Family (3rd Rock from the Sun)
Solon (Haegemonia: Legions of Iron)
Son'a (Star Trek)
Sontarans (Doctor Who)
Soomanii (Utopia)
Sorn (C. S. Lewis' Ransom Trilogy)
Soro (David Brin's Uplift Universe)
Sosiqui (The Journeyman Project 3: Legacy of Time)
Space Pirates (Metroid series)
Spathi (Star Control)
Species 8472 (Star Trek)
Spiridons (Doctor Who)
Spirits (Stargate SG-1)
Splixston (Ben 10)
S'pht (Marathon Trilogy)
Spock (Star Trek)
Spoo (Babylon 5)
Squiz-Quijy (Utopia)
Strogg (Quake II and Quake 4)
Stsho (C. J. Cherryh's Chanur novels)
Suliban (Star Trek)
Superman (Superman I-IV Superman Returns)
Supox (Star Control)
Surrakin | Stargate SG-1 (Humanoid)
Swaparamans (Ascendancy)
Sycorax (Doctor Who)
Sye-Men (Battlelords of the 23rd Century)
Sykarians (Farscape)
Syreen (Star Control)
Taalo (Star Control)
Taelons (Gene Roddenberry's Earth: Final Conflict)
Tachidi (Master of Orion III)
Tagorians (Noon Universe)
Tai (Genome)
Taiidan (Homeworld)
Tak Tak (Star Trek)
Talan (Outcast)
Talarians (Star Trek)
Talaxians (Star Trek)
Tallerians (Warhammer 40,000)
Talokians (DC Comics' Legion of Super-Heroes)
Talosians (Star Trek)
Tamarians (Star Trek)
Tandarans (Star Trek)
Tandu (David Brin's Uplift Universe)
Tanndai Techknights (Battlelords of the 23rd Century)
Tarellians (Star Trek)
Tarentateks (Star Wars)
Tarkans (Farscape)
Tarkas (Sword of the Stars)
Tasoth (X-COM: Terror from the Deep)
Tatanga (Super Mario Land)
Tau (Warhammer 40,000)
Tavleks (Farscape)
Taxxons (K. A. Applegate's Animorphs)
Tc'a (C. J. Cherryh's Chanur novels)
Technarchy (Marvel Comics)
Tecreseans (Battlelords of the 23rd Century)
Tellarites (Star Trek)
Temarkians (Utopia)
Tenctonese (Alien Nation)
Tenebrians (Hal Clement's Close to Critical)
Tentaculats (X-COM: Terror from the Deep)
Terellian (Star Trek)
Terileptils (Doctor Who)
Terran (Final Fantasy IX)
Terra Novans (Star Trek)
Terrelian (Star Trek)
Terrellian (Star Trek)
Terrians (Earth 2)
Tetramand (Ben 10)
Tetraps (Doctor Who)
Thals (Doctor Who)
Thalan (Galactic Civilizations II: Dread Lords)
Thalonian (Star Trek)
Than-Thre-Kull (Andromeda)
Thanagarians (DC Comics)
Thargoids (Elite)
Thasian (Star Trek)
Therbian (See Aaamazzarite) (Star Trek)
Therons (Dan Dare stories)
Tholians (Star Trek)
Thraddash (Star Control)
Thranx (Alan Dean Foster's Humanx Commonwealth series)
Thrint (Larry Niven's Known Space)
Tiberians (Buzz Aldrin and John Barnes' Encounter With Tiber)
Tilikanthua (Utopia)
Time Lords of Gallifrey (Doctor Who)
Titanians (DC Comics' Legion of Super-Heroes)
Titanides (John Varley's Gaea-trilogy)
T'Lani (Star Trek)
Tleilaxu (Dune universe)
Tnuctip (Larry Niven's Known Space)
Toclafane (Doctor Who)
Tok'ra (Stargate SG-1)
Tollan (Stargate SG-1)
Toluen (Imperium Galactica II: Alliances)
Torians (Galactic Civilizations)
Trabe (Star Trek)
Tractators (Doctor Who)
Traeki (David Brin's Uplift Universe)
Tralfamadorians (Kurt Vonnegut's The Sirens of Titan and Slaughterhouse 5)
Tran (Alan Dean Foster's Icerigger)
Transylvanians (Rocky Horror Picture Show)
Transformers (Transformers)
Trandoshans (Star Wars)
Traskans (Farscape)
Treecats (David Weber's Honorverse)
Treens (Dan Dare stories)
Tribbles (Star Trek)
Triceraton (Teenage Mutant Ninja Turtles)
Triscenes (X-COM: Terror from the Deep)
Trilarians (Master of Orion II)
Trills (Star Trek)
Trillions (Nicholas Fisk)
Trinocs (Larry Niven's Known Space)
Tromites (DC Comics' Legion of Super-Heroes)
Tsufurujin (Dragon Ball)
Tsung (Valérian and Laureline)
Tunnel Makers (Einstein's Bridge)
Tusken Raiders (Star Wars)
Turians (Mass Effect)
Twi'leks (Star Wars)
Twinsunians (Little Big Adventure)
Tyranids (Warhammer 40,000)
Tzenkethi (Star Trek)
Umgah (Star Control)
Unas (Stargate SG-1)
Uncreated (Marvel Comics)
Unggoy (Halo)
Ungooma (Ascendancy)
Uniocs (Schlock Mercenary)
Unity (Superman: The Animated Series)
Ur-Quan Kzer-Za (Star Control)
Ur-Quan Kohr-Ah (Star Control)
Utrom (Teenage Mutant Ninja Turtles)
Uryuoms (El Goonish Shive)
U'tani (Star Trek)
Utwig (Star Control)
Vaadwaur (Star Trek)
Vademon (Digimon)
Vanacancia (Utopia)
Varga plants (Doctor Who)
Vardians (Tracker)
Vardrag (Nexus: The Jupiter Incident)
Vasudans (Descent: FreeSpace — The Great War)
Vegetaliens (Tommy and PJ)
Velantians (Lensman books)
Venek (Farscape)
Venom and Carnage (Marvel Comics)
Venom grubs (Doctor Who)
Vervoids (Doctor Who)
Vespids (Warhammer 40,000)
Vhorwed (Schlock Mercenary)
Vidiians (Star Trek)
Vilani (Traveller RPG)
Viltrumites (Invincible)
Vineans (Yoko Tsuno comic)
Visitors (V)
Vogons (The Hitchhiker's Guide to the Galaxy)
Vok (Beast Wars)
Vorc (Farscape)
Vorcarian bloodtracker (Farscape)
Vorlons (Babylon 5)
Vorta (Star Trek)
Vortex life forms (Ecco the Dolphin)
Vorticon (Commander Keen)
Vortigaunt (Half-Life)
Vortisaurs (Doctor Who audio dramas)
Voth (Star Trek)
Vroarscans (Utopia)
Vulcans (Star Trek)
Vulpimancer (Ben 10)
VUX (Star Control)
Vyro-Ingo (Star Control 3)
Wadi (Star Trek)
Waldahudin (Robert J. Sawyer's Starplex)
Wanderers (Noon Universe)
Wang's Carpets (Greg Egan's Diaspora)
The Watcher (Marvel Comics)
Waterseekers (Red Planet)
Weeping Angels (Doctor Who)
Weevils (Torchwood)
Whrloo (Larry Niven's Known Space)
Willis the Bouncer (Red Planet)
Winathians (DC Comics' Legion of Super-Heroes)
Wirrn (Doctor Who)
Wolfweeds (Doctor Who)
Wogneer (Star Trek)
Wookiees (Star Wars)
Wraith (Stargate Atlantis)
W'rkncacnter (Marathon Trilogy)
Xandarians (Marvel Comics)
Xanthuans (DC Comics' Legion of Super-Heroes)
Xarians (Battlelords of the 23rd Century)
Xarquids (X-COM: Terror from the Deep)
Xchagger (Star Control)
Xel'Naga (StarCraft)
Xenomorphs (Alien movies)
Xenexian (Star Trek)
Xilians (Invasion of Astro-Monster and Godzilla: Final Wars)
Xindi (Star Trek)
X-Nauts (Paper Mario: The Thousand-Year Door)
Xorda (Archie Comics' Sonic the Hedgehog comics)
X Parasites (Metroid Fusion)
Xyrillian (Star Trek)
Yag-Kosha (Robert E. Howard's The Tower of the Elephant)
Yanme'e (Halo)
Yautja (Predator)
Yeerks (K. A. Applegate's Animorphs)
Yehat (Star Control)
Yeti (Doctor Who)
Yilane (West of Eden series of Harry Harrison)
Yip-Yips (Sesame Street)
Yoda (Star Wars)
Yolkians (Jimmy Neutron)
Yomingans (Schlock Mercenary)
Yor (Galactic Civilizations)
Yorn (Star Control 3)
Yridian (Star Trek)
Yugopotamians (The Fairly Oddparents)
Yuki Nagato (The Melancholy of Haruhi Suzumiya)
Yuuzhan Vong (Star Wars)
Zabrak (Star Wars)
Zakdorns (Star Trek)
Zaldans (Star Trek)
Zalkonians (Star Trek)
Zaphod Beeblebrox (The Hitchhikers Guide to the Galaxy)
Zarbi (Doctor Who)
Zenetan (Farscape)
Zenn-Lavians (Marvel Comics)
Zen Rigeln (Battlelords of the 23rd Century)
Zentradi (Macross, adapted as the Zentraedi in Robotech)
Zen-Whoberis (Marvel Comics)
Zerg (StarCraft)
Zhodani (Traveller RPG)
Zinoboppians (Melonpool)
Zoq-Fot-Pik (Star Control)
Zorgons (Sluggy Freelance)
Zorgons (Zathura)
Zygons (Doctor Who)