This is a list of extraterrestrial species that have appeared in various works of fiction, sorted by type. Some aliens fit into more than one category, and so appear on the list twice.
Humanoid extraterrestrials
Most aliens are humanoid if not human-like, especially in live action TV series, because the actors are human and only require make-up or masks to appear alien. The Greys described in UFO folklore match this body type. Humanoids include:
Near-relatives, ancestors or descendants of humans
In these stories, these aliens are descended from the same ancestors as humanity, or are themselves ancestors. Some are descended directly from humanity:
- Abh (Crest of the Stars)
- Adeptus Astartes (Space Marines) (Warhammer 40,000)
- Ancients (Stargate SG-1/Stargate Atlantis)
- Ankharans (Crossgen)
- Androsynth, highly intelligent Homo sapiens clones. (Star Control)
- Beastmen (Warhammer 40,000)
- Darrians (Traveller RPG) known for their small, high-technology polity
- Eloi (The Time Machine)
- Futurekind from Doctor Who.
- Gethenians (Ursula Le Guin's Ekumen stories) and other HILFs.
- Haemovores, vampiric creatures descended from humans, mutated by millennia of pollution (Doctor Who)
- Jaffa (Stargate SG-1)
- Kromaggs (Sliders) killer apes who survived early evolution in a parallel Earth. Also considered Aliens From Another Dimension.
- Ludens (Noon Universe)
- Morlocks(The Time Machine)
- Mutants - human beings that have mutated either through natural development or because of radiation (Futurama, X-men, and various others)
- Nebish (Half Past Human and The Godwhale by T.J. Bass (The name is not used in the second novel)).
- Neosapiens (Exosquad)
- Nietzscheans (Andromeda)
- Orion Rogues (Battlelords of the 23rd Century)
- Ogryns (Warhammer 40,000)
- Pak (or Protectors) (Larry Niven's Known Space books) the superintelligent adult form of homo habilis; human Protectors are even more intelligent.
- Primords, humans mutated into ape-like beasts (Doctor Who)
- Ratlings (Warhammer 40,000)
- Sebaceans (Farscape)
- Second through Last Men (Olaf Stapledon's Last and First Men)
- Squats (now extinct - Warhammer 40,000)
- Spaceballs (race from a movie of the same name)
- Terra Novans (Star Trek)
- Toclafane (Doctor Who)
- Underpeople - animals that have been modified to appear and act human. (Works of Cordwainer Smith)
- Vilani (Traveller RPG) known for their bureaucratic tendencies and empire building
- Zhodani (Traveller RPG) known for their psychic abilities
- in Star Trek: The Next Generation, the episode "The Chase" revealed that all the humanoid races in the galaxy are the result of genetic tinkering by a single humanoid race in the distant past.
- similarly, in Marvel Comics' The Eternals, it was revealed that many species were genetically tampered with by the alien Celestials.
Feline humanoids
This form has been popular (see Cat-like aliens). They are usually warrior-like as well:
- Aslan (Traveller RPG)
- Caitians from Star Trek (Only seen in the animated series)
- Cat People from Doctor Who.
- Centrans (Christopher Anvil's Pandora's Planet stories)
- Cheetah People (Doctor Who From the final story of the original series Survival)
- Cizerack (Battlelords of the 23rd Century)
- Ctarl-Ctarl (Outlaw Star)
- Fefethil (Robert Westall's Urn Burial)
- Felinetta or Cat-People (Doctor Who Missing Adventures: Invasion of the Cat-People by Gary Russell)
- Fellpool or Hellpool (Star Ocean)
- Hani (C. J. Cherryh)
- Kilrathi (Wing Commander games)
- Klees (Pendragon series)
- Krangs (Bravestarr animated space western TV series)
- Kymnar (FTL:2448 RPG)
- Kzinti (Larry Niven's Known Space series)
- Lyrans (Star Trek)
- Mephitisoids (Marvel Comics) - see also Hepzibah
- Mrrshan (Master of Orion)
- Moggians (Freighter Tails: The Misadventures of Mzzkiti) Apparently named after their god(dess?) the Great Mogg
- Na'vi (Avatar)
- Thundereans (Thundercats)
- Tiberians (Buzz Aldrin and John Barnes' Encounter With Tiber)
- Tiger Men of Mars (Buck Rogers)
- Tran (Alan Dean Foster's Icerigger)
- Unnamed aliens (Fritz Leiber's The Wanderer)
- various aliens of the Star Wars universe; a more-or-less complete list can be found on Wookieepedia
- Minggi (Barton Paul Levenson's Rain and Revenge)
- Fearcats Power Rangers: Operation Overdrive
Canine humanoids
- Canid (Penny Arcade)
- Chief Anubis "Doggie" Cruger (Power Rangers: SPD)
- Doog (Star Control)
- Jackalmen (Thundercats)
- Loboan (Ben 10)
- Mawg (Spaceballs)
- Melmacians (ALF)
- Pemalites (Animorphs)
- Shistavanen (Star Wars)
- Vargr (Traveller RPG)
Insectoid and arachnid aliens
- Arachnids (Battlelords of the 23rd Century)
- Brood (Marvel Comics)
- Bugs from Klendathu (Starship Troopers)
- Bugs (Men in Black)
- The Colony (Final Days of the Planet Earth)
- Cinnrusskin of James White's Sector General series
- Drak (Farscape)
- Driel (Dark Planet)
- Drone (Halo 2)
- Antlion swarm (Half Life 2)
- Empress of the Racnoss from Doctor Who.
- Formics (Ender's Game series by Orson Scott Card)
- Gaim (Babylon 5)
- Grue (Pitch Black)
- The Inibit from Genesis Climber Mospeada (called "Invid" in the Robotech american adaptation)
- Insects (The History of the Galaxy by Andrey Livadny)
- Insects in Steph Swainston's Castle series.
- Ilwrath - (Star Control)
- Klackons (Master of Orion)
- Klicks (Star*Drive)
- Klikiss (Saga of Seven Suns)
- The Lexx race (Lexx and "Little Lexx" from Lexx)
- Locust (listed under insectoid because of their superorganism-like society, the various Locust types are similar to a variety of creatures such as arachnids, humans, monkeys, bats, Queen type hive insects, jellyfish, and squid) (Gears of War)
- Majat (Alliance-Union universe of C. J. Cherryh)
- Mantis (Conquest: Frontier Wars)
- Marmosians (Ascendancy)
- Mind worms (Sid Meier's Alpha Centauri)
- Menoptra (Doctor Who)
- Mesklinites of Hal Clement's Mission of Gravity (millipede-like)
- Optera, (Doctor Who)
- "Prawns" (District 9)
- Re'tu (Stargate SG-1)
- Shivans (Descent: FreeSpace – The Great War)
- Spider Aliens (Valiant Comics)
- Lepidopterran (Ben 10)
- Tachidi (Master of Orion)
- Tecreaseans (Battlelords of the 23rd Century)
- Than (Andromeda)
- Thargoids from Elite (computer game)
- Thranx of Alan Dean Foster's Humanx Commonwealth series
- Tyranid Warhammer 40,000
- Tractators (Doctor Who)
- Team Space Bug of Kaiju Big Battel
- Uchuu Kaijuu ("Space Monsters") from Gunbuster
- Ur-Quan Kohr-Ah (Star Control)
- Ur-Quan Kzer-Za (Star Control)
- The Vajra from Macross Frontier
- Vore (Doctor Who: The Gallifrey Chronicles by Lance Parkin)
- Wreaves (ConSentiency universe)
- Wirrn (Doctor Who, The Ark in Space)
- Xeno (Alone in the Dark)
- Xenomorph (The Alien series)
- Xindi (Star Trek)
- Zarbi (Doctor Who)
- Zerg (StarCraft)
Centaurs
- Andalites of K. A. Applegate's Animorphs
- Ishtarians of Poul Anderson's Fire Time
- K'kree of Traveller RPG
- Pierson's Puppeteers of Larry Niven's Known Space series (sort of).
- Tenebrians of Hal Clement's Close to Critical
- Titanides of John Varley's Gaea Trilogy
- Vedrans of Gene Roddenberry's Andromeda
Reptilians and amphibians
Another popular form. See also Reptilian humanoid.
- Aeodronians (Battlelords of the 23rd Century)
- Badoon (Marvel Comics)
- Bwaps (Traveller RPG) Also known as "Newts"
- Caldarans (Andromeda)
- Cardassians (Star Trek)
- Chamachies (Ascendancy)
- Chelonians (Doctor Who novels)
- Dracs of Barry B. Longyear's The Enemy Papers stories
- Draconians (Doctor Who)
- Drakh(Babylon 5)
- Dragonets (Anne McCaffrey)
- Dragons (Anne McCaffrey)
- Droyne (Traveller RPG)
- Foamasi (Doctor Who)
- Gorn (Star Trek)
- Grendarl (Master of Orion)
- the frog-like Gowachin of Frank Herbert's stories
- Hazudra (Tyrian)
- Hutts (Star Wars)
- Hynerians (Farscape)
- Ice Warriors (Doctor Who)
- Jem'Hadar (Star Trek)
- Lithians of James Blish's A Case of Conscience
- Makluans (Marvel Comics) - see also Fin Fang Foom
- Mentors, (Doctor Who)
- Monoids (Doctor Who)
- Omicronians / Popplers (Futurama)
- Pifltriggi (Out of the Silent Planet)
- Protoss (StarCraft)
- Python Lizards (Battlelords of the 23rd Century)
- Raas (Master of Orion)
- Ram Pythons (Battlelords of the 23rd Century)
- Reapers (Doctor Who)
- Reptilians (Thundercats)
- Rills (Doctor Who)
- Rodians (Star Wars)
- The Race (Harry Turtledove's Worldwar)
- Sakkra (Master of Orion)
- Saurians (Crossgen)
- Saurids (Marvel Comics) - see also Ch'od
- Scarrans (Farscape)
- Sea Devils (Doctor Who)
- Seekers/En'kull (Advent Rising)
- Sheyangs (Farscape)
- Silurians (Doctor Who)
- Skaarjs (Unreal)
- Skrulls (Marvel Comics)
- Snake Men (Masters of the Universe)
- Snarks (Marvel Comics)
- Tagorians (Noon Universe)
- Triceratons (Teenage Mutant Ninja Turtles)
- Terileptils (Doctor Who)
- Trandoshans (Star Wars)
- Unas (Stargate SG-1)
- Vaadwaur (Star Trek)
- Vaxasaurian (Ben 10: Alien Force)
- Velantians (Lensman books) notable for their multiplicity of eyes and various appendages
- Vortisaurs, (Doctor Who audio dramas)
- Voth (Star Trek) - this species descended from Earth dinosaurs
- Xindi (Star Trek)
- Predator (Predator)
- Yilane of West of Eden series of Harry Harrison
- Zorgons (Zathura)
- and various variations of dinosaurs
Aquatic species
- Aurelians (Advent Rising)
- Babel fish (Douglas Adams)
- Decapodians (Futurama)
- Deep Ones (H. P. Lovecraft)
- Delphons (The History of the Galaxy by Andrey Livadny)
- Fludentri (Ascendancy)
- Leerans (Animorphs}
- Gungans (Star Wars)
- Mon Calamari (Star Wars)
- Quarren "Squid Heads" (Star Wars)
- Nommo (Master of Orion)
- Piscciss Premann (Ben 10)
- Piscciss Volann (Ben 10)
- Selkath (Star Wars)
- Squeem (Xeelee Sequence)
- Trilarians (Master of Orion)
- The Vortex life forms (Ecco the Dolphin; assumed to be aquatic)
- Xindi (Star Trek)
Parasites and symbiots
- Andromeni (Battlelords of the 23rd Century)
- the "body snatcher pods" from The Body Snatchers (and its film adaptations)
- Bebi (Dragonball GT)
- Byrum (Mr. Gray) (Dreamcatcher (novel) by Stephen King)
- Energy Rider (Farscape)
- Goa'uld (Stargate SG-1)
- Ing (Dark creatures with the ability to possess living beings, the dead, and the artificially intelligent, who become darklings.) (Metroid Prime 2: Echoes)
- the eponymous aliens of The Puppet Masters
- the endosymbionts of Hal Clement's Needle and Through the Eye of a Needle
- The eponymous Metroids
- The Flood (Halo series)
- The Hive (Dark Skies)
- The Invid (Robotech), adapted from the non-parasitic Imbit from Genesis Climber Mospeada
- Iskoort (Animorphs)
- Symbiotes (Venom and Carnage of Marvel Comics)
- Trills (Star Trek)
- The wind (Hooded Swan series)
- the Wirrn, Krynoid, and Fendahl from Doctor Who
- Ungooma (Ascendancy)
- Xenocytes (Ben 10: Alien Force)
- Ship (Ben 10: Alien Force)
- Yeerks (Animorphs)
- X Parasites (Metroid)
- Xenomorph (Alien)
- Black oil of the Colonists (X-Files)
- the wind (Brian Stableford's Star Pilot Granger series)
Robotic and mechanical aliens
Aliens that are created through technological means. This category also includes lifeforms that have been altered so that their existence depends on implants and other technologies.
- Autons (Doctor Who)
- Asurans (Stargate: Atlantis)
- Berserkers (Fred Saberhagen's Berserker series)
- Borg (Star Trek)
- Bynars (Star Trek)
- Chee (Animorphs}
- Chmmr (Fusion species between the crystalline Chenjesu and the mechanical Mmrnmhrm.) (Star Control)
- Consensus of Parts, the (Andromeda)
- Outcast Consensus (Andromeda)
- Cybermen (Doctor Who)
- Cylons (Battlestar Galactica)
- Cynoids (Master of Orion)
- Daleks (Doctor Who)
- Elysians (Mechanoids on Elysia built by the Chozo)) (Metroid Prime 3: Corruption)
- The Geth (Mass Effect)
- Grox (Spore)
- Galvanic Mechomorphs (Ben 10)
- Irkens (Invader Zim)
- Max (Flight of the Navigator)
- Meklars (Master of Orion)
- Minions (Ascendancy)
- Mmrnmhrm (Star Control)
- Necrons (Necrontyr given immortality by the C'tan) (Warhammer 40,000)
- Phalanx (Marvel Comics)
- Quintessons (Transformers)
- Quarks, (Doctor Who)
- Replicators (Stargate SG-1)
- S'pht (Marathon)
- Smash Martians
- Technarchy (Marvel Comics)
- Toclafane from Doctor Who.
- Transformers
Rodents
- Baliflids (Ascendancy)
- Ranat (Star Wars)
- Porcupine Character Ben 10
- Argit (Ben 10: Alien Force)
- Pierce (Ben 10: Alien Force)
Space-living creatures
These fictional creatures purport to thrive in the biome of outer space.
- Bentusi (Homeworld)
- Budong (Farscape)
- Forerunners (The History of the Galaxy by Andrey Livadny)
- Gomtuu (Star Trek)
- Leviathan (Farscape)
- The Lexx race (Lexx and "Little Lexx" from Lexx)
- Outsiders (Larry Niven's Known Space series)
- The Acanti race from Marvel Comics.
- Oswafts, vacuum-breathers from Lando Calrissian and the Star Cave of the Thonboka (Star Wars).
Sentient plants & fungi
- The Arbryls (Ascendancy)
- Audrey 2 (Little Shop of Horrors (musical))
- Byrus (Dreamcatcher (novel) by Stephen King)
- The Cotati (Marvel Comics)
- Delvians (Farscape)
- Deathworld Flora (found on planets like Catachan and Caliban (pre climactic explosion)) (Warhammer 40,000)
- The Forest of Cheem (Doctor Who)
- Florauna (Ben 10)
- The Flowers of Lophai (Clark Ashton Smith)
- The Frutmaka (Ascendancy)
- The Krynoids (Doctor Who)
- Lyekka (Lexx)
- Methanosian (Ben 10: Alien Force)
- Mycon (Star Control)
- Skroderiders (Vernor Vinge's A Fire Upon the Deep)
- Supox (Star Control)
- the thorian (Mass Effect)
- Varga plants (Doctor Who)
- Vervoids (Doctor Who)
- Vulthoom (Clark Ashton Smith)
- Wolfweeds (Doctor Who)
- World 4470 (Hainish Cycle)
- Oscar from The Lotus Eaters
Ancient/Primordial races
Aliens that have either disappeared and left only ruins or developed to godlike, practically omnipotent entities.
- Unnamed and unseen aliens in the Space Odyssey series (In the prologue of 3001: The Final Odyssey they are called the "Firstborn", but never referred to as such in-story in any novel in the series.)
- Ancients (Descent: FreeSpace – The Great War)
- Ancients (Farscape)
- The Ancients (Alterans and Ori from Stargate)
- Ancient Galvans/Galvan Gods (Ben 10)
- Assassins (The Heechee Saga)
- Ancients (Traveller RPG)
- The Arisians and Eddorians of E. E. Smith's Lensman novels
- Bule from Star Sonata
- Celestials (Marvel Comics)
- Chozo (Metroid)
- Cocytans from Lucasarts' The Dig
- H.P. Lovecraft's Elder Gods
- Faranji from Star Sonata
- The First Ones from Babylon 5
- Forerunner (Halo)
- Furlings (Stargate SG-1)
- The Hanshaks from the Ascendancy Universe are an ancient race of toroidal mind-bodies.
- Heechee (The Heechee Saga)
- Iconians (Star Trek)
- Jjaro (Marathon)
- Kimera from Earth: Final Conflict
- Metron from Star Trek:TOS
- Mzungu from Star Sonata
- The Necrontyr, who later became the Necrons (Warhammer 40,000)
- Nox (Stargate SG-1)
- both of Terry Pratchett's early science fiction novels, Strata and The Dark Side of the Sun, offer subversions of the paradigm
- See also Arthur C. Clarke's short story "The Star"
- Oans (DC Comics)
- Nebula, the (Andromeda)
- The races of the Occlith and the Voorqual (Clark Ashton Smith)
- Old Ones (Warhammer 40,000)
- Old Ones/Elder Things (H. P. Lovecraft)
- Organians and Ancient humanoids (Star Trek)
- Paradine, the (Andromeda)
- Psionics (Notrium)
- Precursors (Star Control)
- The Progenitors of (Homeworld 2)
- Protoculture (Macross)
- Shadows (Babylon 5)
- T'kon (Star Trek)
- Thran (Magic: The Gathering)
- UrQa from Star Sonata
- Vazaha from Star Sonata
- Vorlons (Babylon 5)
- W'rkncacnter (assuming there is more than one) (Marathon)
- Watchers (Marvel Comics)
- Xel'Naga (StarCraft)
- Xeelee (Xeelee Sequence)
More unusual forms
- Aliens from Sector General by James White are among the most diverse. Crystalline methane creatures, continent sized carpets, rolling ring-shaped aliens, chlorine breathers, radiation eating telepaths and creatures assembled from several symbiont species meet in a setting of space hospital.
- Aliens that are product of mechanical evolution in The Invincible by Stanisław Lem
- The Animus, a telepathic alien intelligence with a corporeal form resembling an octopus (Doctor Who)
- Ark Megaforms (a non-humanoid race from Noon Universe, no information on appearance available)
- Abyormenites of Hal Clement's Cycle of Fire (floating ballons - one race, that is)
- Beta Renner cloud (Star Trek)
- Black Cloud of Fred Hoyle (interstellar dust cloud)
- C'tan ('Star Vampires' worshipped and given corporeal form by the Necrontyr, only four still exist, only two of which (the Nightbringer and the Deceiver) are active, Mars (The Void Dragon) is believed to be one that was covered by space dust over trillions of years ago) (Warhammer 40,000)
- The Caleban of Frank Herbert's Whipping Star (invisible telepathic beings who are actually the minds of stars)
- The Celareon of Conquest: Frontier Wars RTÉ Game, peaceful beings of pure energy. They constructed mechanical bodies with which they interact with his entourage, and they control it by a cell where lie their true "body".
- Chenjesu, intelligent silicon-based crystals (Star Control)
- Chronomyst (Ascendancy), sentient jellyfish-like creatures that communicate by refracting light within their bodies.
- The Chtorr, pink wormlike creatures from David Gerrold's War Against the Chtorr series. According to David, the Chtorr can also refer to the entire alien ecology.
- Dnyarri, non-humanoid Telepaths (Star Control)
- The Doublers, two-in-one semi-humanoids of Stanisław Lem's Eden
- Dralasite, an amoeboid race introduced in the Star Frontiers role-playing game
- Drej, a race responsible for the destruction of Earth; made out of pure energy, Titan A.E.
- The Dubtaks from the Ascendancy Universe remind of sperm cells.
- Dugs (Star Wars)
- Dyson Aliens (Peter F. Hamilton's "Pandora's Star")
- Ego the Living Planet (Marvel Comics)
- Eldila, barely visible faint, shifting light that are native to interplanetary space. (Space Trilogy)
- The Face of Boe, a giant head in a jar-like support system (Doctor Who)
- Father (Animorphs) an intelligent entity formed from a network of algae and alien corpses spread across an ocean planet.
- Meehooks from the comic book series Fusion, "dinosaurs with fur"
- Gadmeer who live in a sulphur environment. (Stargate SG-1)
- Garrotian Snails (Noon Universe)
- The Gelth, intelligent gaseous lifeforms (Doctor Who)
- Ghatanothoa of H. P. Lovecraft (has Gorgon-like visual properties)
- Ghroth from Ramsey Campbell's short story "The Tugging" (small, sentient planet with a large red eye)
- Giygas from EarthBound (Mother 2)
- The Gladifers of Dennis Paul Himes
- The Govorom species from the Ascendancy Universe are feminine-like spirits of nature.
- Great Race of Yith of H. P. Lovecraft (Disembodied, time-hopping minds of a long-dead alien race; Known bodies used are gigantic molluscs and large beetles)
- Harmonia (The Sirens of Titan), a cave-dwelling flatworm-like race living on Mercury.
- Headies (a kynoid (dog-like) sentient race from Noon Universe)
- Hivers of Traveller RPG (modified starfish)
- Hooloovoo, non-corporeal beings, when refracted in a prism, appear as a shade of blue. (The Hitchhiker's Guide to the Galaxy)
- Horta (Star Trek), silicon-based tunneller.
- The Invaders of John Varley's Eight Worlds novels, higher-dimensional beings originating from a gas giant.
- Kambuchka (Ascendancy).
- Judoon, Humanoid Rhinos (Doctor Who)
- Kymellians, humanoid horses (Marvel Comics)
- Lloigor from Colin Wilson's Return of the Lloigor (Vortices of energy; Solidify as vast, alien reptiles)
- Logrians from Andrey Livadny's The History of the Galaxy series (two-headed xenomorphs)
- Ly-Cilph, begin their lives as corporeal, but can latter become non-corporeal being. (Night's Dawn Trilogy)
- The Macra, giant crab-like aliens with telepathic and hypnotic ability (Doctor Who)
- Mars People in Metal Slug series
- Martians from H.G. Wells The War of the Worlds
- Mebes, Giant single-celled sentient organisms from the Ascendancy Universe.
- Melnorme (Star Control)
- Methorians of Barrington J. Bayley's Zen Gun (gaseous giant-giant dwellers)
- Medusans (Star Trek), an incorporeal race who cannot be looked at by humanoids.
- Nimbuloids, a species of large sentient gas creatures from the Ascendancy Universe.
- Oankali of Octavia Butler's Xenogenesis series
- Orfa (Ascendancy)
- Ogri, silicon-based life form resembling standing stones (Doctor Who)
- Pan Spechi, each individual has five different bodies, occuping each one throughout their life time. (ConSentiency universe)
- Puppeteers of Larry Niven's Ringworld and Known Space series (three legs, two manipulative heads)
- Pilots (Farscape)
- Phantoms (a ghost-like race from Final Fantasy: The Spirits Within)
- Photino Birds, made up of Dark Matter (Xeelee Squence)
- Pkunk, appear like Toucans (Star Control)
- Prophets (Star Trek)
- Qax (Xeelee Squence)
- Rigellians (Lensman books) which are barrel-shaped with four tentacular arms and four stubby legs
- Mr. Saturn (EarthBound)
- The Scrin of Command & Conquer, an intelligent species of unknown form which are apparently symbiotic with the crystal, root and spore, Tiberium.
- Shevar (Ascendancy), an inorganic race from an alternate universe that feeds on life force.
- Shoggoths (H. P. Lovecraft)
- Silicoids, a race of sentient crystals in the Master of Orion universe
- The Slitheen (or, more accurately, Raxicoricofallopatorians — Slitheen is a family name, not the species), bipedal, vaguely humanoid creatures with sharp claws and baby faces, made of living calcium, (Doctor Who)
- Slylandro (Star Control)
- The Snovemdomas from the Ascendancy Universe are similar to mammoths.
- Solaris by Stanisław Lem (living ocean)
- Spathi, similar to shellfish (Star Control)
- Sphere (Sphere (novel) by Michael Crichton)
- Spline, whalelike creatures that rebuilt themselves into living ships (Xeelee Squence)
- Sqid, a squidlike species in Freefall.
- Swaparamans (Ascendancy)
- Tetraps, vaguely humanoid bat-like creatures with four eyes allowing 360 degree vision (Doctor Who)
- Tholians (Star Trek)
- Thraddash, boar- or rhino-like creatures with whiskers (Star Control)
- Tralfamadorians of Kurt Vonnegut (The Sirens of Titan, Slaughterhouse 5)
- Treecats - Six-limbed cats (Honor Harrington Series)
- Trillions of Nicholas Fisk (small collective crystals)
- Trisolians(Humanoid creatures made out of liquid) (Futurama)
- Taprisiots (Whipping Star, The Dosadi Experiment)
- Tweel from A Martian Odyssey
- Umgah, large, pink or lilac-colored blobs (Star Control)
- Utroms (Teenage Mutant Ninja Turtles)
- VUX, green tentacular creatures (Star Control)
- Wanderers (most mysterious of the Noon Universe races, no information about their appearance is available, but most likely they're non-humanoid)
- Watchers In The Dark (highly telepathic creatures that inhabit the ruins of Caliban, home of the Dark Angels Space Marine Chapter) (Warhammer 40,000)
- Yag-Kosha, from Robert E. Howard's The Tower of the Elephant (humanoid elephant)
- Yehat, pterodactyl-like creatures (Star Control)
- Yuggs (Maggot-like)
- Zebesian Space Pirates (Metroid series — the species has a wide range of morphological variety)
- Zonama Sekot - a sentient planet with mysterious, powerful abilities. (Star Wars)
- Zoq-Fot-Pik (Star Control)
Shape-shifting aliens
- Capelons (Ascendancy)
- Aylee - (Sluggy Freelance) - Shapeshifts every stage of the lifecycle
- Clawdite - (Star Wars)
- Chameloids (Star Trek)
- Changelings (Star Trek)
- Darlok (Master of Orion)
- Durlans, the race of Chameleon Boy from the Legion of Super-Heroes (DC Comics)
- The Green and White Martians of the DC universe - see also Martian Manhunter
- High Ones (Elfquest)
- Krillitanes (Doctor Who)
- Makluans (Marvel Comics) - see also Fin Fang Foom
- Mangalores, the mercenary race of shapeshifters from The Fifth Element
- Martians (Invincible)- see Shapesmith
- Mazians (Battlelords of the 23rd Century)
- Plasmavore (Doctor Who)
- Rutans (Doctor Who)
- The Skrulls (Marvel Comics)
- Time Lords/Gallifreyans (Doctor Who) - see Regeneration
- Iznicans in ('Non-Canon Star Wars)
- Limax (Ben 10)
Unintelligent creatures
These fictional extraterrestrials display no signs of sentience.
- Banthas (Star Wars)
- Colour out of space by H. P. Lovecraft (disputed)
- Dentics (Farscape) - Non-sentient insectoids used by humanoids to clean their teeth.
- Flat cats from Robert A. Heinlein's novel The Rolling Stones
- Gizka (Star Wars)
- Horda (Doctor Who)
- (devolved) Macra (Doctor Who)
- Sandworm (Dune)
- Skrills (Earth: Final Conflict)
- Spoo (Babylon 5)
- Tribbles (Star Trek)
- Varga plants (Doctor Who)
- Venom grubs (Doctor Who)
- Wolfweed (Doctor Who)
Aliens from other dimensions
- 5th dimensional imps (DC Comics also see Mr. Mxyzptlk)
- Annihilus, Blastaar and other natives of the Negative Zone (Marvel Comics)
- The Anti-Monitor (DC Comics)
- Arilou (Star Control)
- Bakugan
- Daemons/Daemonettes (Warhammer 40,000)
- Digimon (Digimon)
- The D-Reaper from Digimon (Toei Animation)
- The DigiGnomes from Digimon (Toei Animation)
- Hounds of Tindalos-Mysterious, angular, timeless beings with no accurate given description. (Frank Belknap Long)
- Krang
- Khorne (Warhammer 40,000)
- The Krith of Richard C Merediths Timeliner Trilogy
- Lawbringers (Crossgen)
- Micronauts
- Nurgle (Warhammer 40,000)
- Orbulon of the WarioWare series
- Orz (Star Control)
- Q (Star Trek)
- Qwardians (DC Comics)
- Reapers (Doctor Who)
- Sau-Bau (Battlelords of the 23rd Century)
- Servitors of the Outer Gods (H. P. Lovecraft)
- Slaanesh (Warhammer 40,000)
- Species 8472 (Star Trek: Voyager)
- Sphere Builders (Star Trek)
- The Spineless Ones (Marvel Comics) - see also Mojo
- The Technet (Marvel Comics)
- Tzeentch (Warhammer 40,000)
- Unnamed telepathic aliens of Babylon 5: Thirdspace
- Warwolves (Marvel Comics)
- Warp entities (Warhammer 40,000)
Galactic communities
Interstellar governments or communities in which several alien civilizations interact: (see also List of fictional governments).
- Galactic Federation of light
- Babylon 5's Babylon Project and later the Interstellar Alliance
- The Borg Collective (Star Trek)
- Pfhor (Marathon)
- The Covenant (Halo)
- The ConSentiency universe (Frank Herbert's The Dosadi Experiment)
- Galactic Patrol (E.E. Smith)
- Uplift series by David Brin depicts pan-galactic community of various alien species
- Known Space by Larry Niven on a smaller scale
- Star Trek's United Federation of Planets
- Star Wars's Galactic Empire, Galactic Republic, and New Republic
- Systems Commonwealth (Andromeda)
- The Tau Empire (Warhammer 40,000)
- The Eye of Terror (Home of many Chaos Space Marines Legions, Warhammer 40,000)
- Dalek Empire
- Data Integration Thought Entity and the Sky Canopy Domain from the Haruhi Suzumiya series.
- Galactic Federation (Metroid)
- High Council of System Lords (Stargate SG-1)
- Psychlo Government (Battlefield Earth)
- Machine Empire (Power Rangers)
- Yuuzhan Vong Empire (Star Wars)
- Dominion (Star Trek)
- Klingon Empire (Star Trek)
- Cardassian Union (Star Trek)
- Romulan Star Empire (Star Trek)
- Kelvan Empire (Star Trek)
- Ur-Quan Hierarchy (Star Control)
Ultramar- Home of the ultramarines space marine legion- war hammer 40,000-
References
- Wayne Douglas Barlowe, Ian Summers and Beth Meacham: Barlowe's Guide to Extraterrestrials
- Stanley Schmidt: Aliens and Alien Societies (Writer's Digest)
- Jack Cohen and Ian Stewart: Evolving the Alien - the science of extraterrestrial life
- Cliff Pickover: 2003 The Science of Aliens New York: Basic Books. ISBN 0-465-07315-8
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