This is a list of aliens that have appeared in various works of fiction featuring aliens, sorted by type.

Humanoid Aliens

Most aliens are humanoid if not human-like, especially in TV series because actors are human. The Greys described in UFO folklore match this body type. Humanoids include:

• Acquarans (Farscape)
• Aliens from Independence Day
• Amnioni (Stephen Donaldson's The Gap Cycle)
• Andorians (Star Trek)
  • Aenars - Andorian Subspeices (Star Trek)
• Atevi (C. J. Cherryh's Foreigner series)
• Asgard (Stargate SG-1)
• Bajorans (Star Trek)
• Bandi (Star Trek)
• Banik (Farscape)
• Betazoid (Star Trek)
• Bolians (Star Trek)
• Boolite (Farscape)
• Bothans (Star Wars)
• Breen (Star Trek)
• Brunnen G (Lexx)
• Centauri (Babylon 5)
• Charrids (Farscape)
• Colatas (Farscape)
• Coreeshi (Farscape)
• Dakkamites (Marvel Comics)
• The Dance (Marvel Comics)
• Daxxamites (DC Comics)
• Deep Ones (H. P. Lovecraft)
• Delvians (Farscape)
• Deneans (Farscape)
• Denobulans (Star Trek)
• Dentics (Farscape)
• Deltans (Star Trek)
• El-Aurians (Star Trek)
• Eldar/Dark Eldar (Warhammer 40,000)
• Elves (descended from High Ones, see below)(Elfquest)
• Ewoks (Star Wars)
• Ferengi (Star Trek)
• Grans (Star Wars)
• Gamilons/Gamilus (Space Battleship Yamato/Star Blazers)
• Gretchin (small goblin like creatures who work for the Orks) (Warhammer 40,000)
• Grots (Even smaller greenies who work for the Orks) (Warhammer 40,000)
• Grudeks (Farscape)
• Grunds (Marvel Comics)
• Halosians (Farscape)
• Hangi (Farscape)
• High Ones (Elfquest)
• Hur'q (Star Trek)
• Hydrans (Star Trek)
• Hynerians (Farscape)
• Ilanics (Farscape)
• Interions (Farscape)
• Jocaceans (Farscape)
• Kafers (2300AD)
• Kalish (Farscape)
• Karrema (Star Trek)
• Kazon (Star Trek)
• Khunds (DC Comics)
• Khurtarnan (Farscape)
• Klingons (Star Trek)
• Kree (Marvel Comics)
• Kryptonians (DC Comics)
• Kymellians (Marvel Comics)
• Laxidasians (Marvel Comics)
• Luxans (Farscape)
• Lyrans (Star Trek)
• Martians
  • H.G. Wells' The War of the Worlds
  • Edgar Rice Burroughs's Barsoom series
  • Ray Bradbury's The Martian Chronicles
  • Aelita (1924 movie)
  • Mars Attacks (Topps trading cards and Tim Burton movie)
  • ... and many others
• Minbari (Babylon 5)
• Mondoshawan (The Fifth Element)
• Mri (C. J. Cherryh's Faded Sun trilogy)
• Narn (Babylon 5)
• Nebari (Farscape)
• Neutrals (Futurama)
• Nox (Stargate SG-1)
• Oans (DC Comics)
• Oannes Stargate SG-1
• Ocampa (Star Trek)
• Orks (decendants of the Krork that grow from fungus) (Warhammer 40,000)
• Ortheans (Mary Gentle's Golden Witchbreed) androgynous until puberty
• Pilots (Farscape)
• Phagors (Brian W. Aldiss's Helliconia series)
• Porquinhos (Orson Scott Card's Speaker for the Dead)
• Psychlos (Battlefield Earth)
• Re'ol Stargate SG-1
• Relgarians (Farscape)
• Romulans (Star Trek)
• Scarrans (Farscape)
• Scorvians (Farscape)
• Shi'ar (Marvel Comics)
• Snotlings (another of the green races collectively known to man as Orks) (Warhammer 40,000)
• Sontarans (Doctor Who)
• Spirits Stargate SG-1
• Squigs (As snotlings) (Warhammer 40,000)
• Surrakin Stargate SG-1
• Suliban (Star Trek)
• Sykarians (Farscape)
• Taelons ()
• Talaxians (Star Trek)
• Tarkans (Farscape)
• Tau (Warhammer 40,000)
• Tavleks (Farscape)
• Tectonese (Alien Nation)
• Tellarites (Star Trek)
• Terrians (Earth 2)
• Time Lords/Gallifreyans (Doctor Who)
• the Tleilaxu of Frank Herbert's Dune novels
• Trabe (Star Trek)
• Traskans (Farscape)
• Trolls (Elfquest)
• Tusken Raiders (Star Wars)
• Twi'leks (Star Wars)
• Venek (Farscape)
• Vineans (Yoko Tsuno (blue skin) comic)
• Vorc (Farscape)
• Vorcarian (Farscape)
• Vorta (Star Trek)
• Vulcans (Star Trek)
• The Wraith Stargate SG-1
• Wookiees (Star Wars)
• Xandarians (Marvel Comics)
• Xindi (Star Trek)
• Yuuzhan Vong (Star Wars)
• Zabrak (Star Wars)
• Zenetan (Farscape)
• Zen 'Kethi (Star Trek)
• Zenn-Lavians (Marvel Comics)
• Zentradi (Macross), adapted as the Zentraedi in Robotech
• Zen-Whoberis (Marvel Comics)

Near-relatives of mankind

In these stories, these aliens are descended from the same ancestors as humanity. Some are descended directly from humanity:

• Abh (Crest of the Stars)
• Adeptus Astartes, also known as Space Marines (Warhammer 40,000)
• Darrians (Traveller RPG) known for their small, high-technology polity
• Gethenians (Ursula Le Guins Ekumen stories) and other HILFs.
• Jaffa Stargate SG-1
  • Kull Warriors Stargate SG-1
• Kromags (Sliders) descended from Cro-Magnons
• Mutants - Human beings that have mutated ethier through natural development or because of radiation (Futurama, X-men, and various others)
• Nietzscheans (Andromeda)
• Pak (or Protectors) (Larry Niven's Known Space books) the superintelligent adult form of homo habilis; human Protectors are even more intelligent.
• Neosapians (Exosquad)
• Primarch's (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)
• His Majesty The Emperor (Warhammer 40,000)
• 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. They are usually warrior-like as well:

• Aslan (Traveller RPG)
• Centrans (Christopher Anvil's Pandora's Planet stories)
• Cheetah People (Doctor Who From the final story of the original series 'Survival)
• Ctarl-Ctarl (Outlaw star)
• Felinetta or Cat-People (Doctor Who Missing Adventures: Invasion of the Cat-People by Gary Russell)
• Hani (C. J. Cherryh)
• Kilrathi (Wing Commander games)
• Kymnar ( RPG)
• Kzinti (Larry Niven's Known Space series)
• Lyran (Star Fleet Universe)
• 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 )

Canine humanoids

• Melmacians (Alf)
• Pemalites (Animorphs)

Insectoid and Arachnid Aliens

• Brood (Marvel Comics)
• Bugs from Klendathu (Starship Troopers)
• Buggers (Ender's Game series by Orson Scott Card)
• Chigs (Space: Above and Beyond)
• Cinnrusskin of James White's Sector General series
• Drak (Farscape)
• Gaim (Babylon 5)
• Menoptera (Doctor Who)
• Mesklinites of Hal Clement's Mission of Gravity (millipede-like)
• Re'tu Stargate SG-1
• Thargoids from Elite_(computer_game)
• Thranx of Alan Dean Foster's Humanx Commonwealth series
• Vore (Doctor Who: The Gallifrey Chronicles by Lance Parkin)
• Wirrin (Doctor Who, The Ark in Space)
• Xenomorphs (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
• Pierson's Puppeteers of Larry Niven's Known Space series
• Tenebrians of Hal Clement's Close to Critical
• Titanides of John Varley's Gaea-trilogy
• Vedrans of Gene Roddenberry's Andromeda

Reptilians and Amphibians

• Badoon (Marvel Comics)
• Cardassians (Star Trek)
• Dracs of Barry B. Longyear's The Enemy Papers stories
• Draconians (Doctor Who)
• Drakh(Babylon 5)
• Dragonets (Anne MacCaffery)
• Dragons (Anne MacCaffery)
• Gorn
• the frog-like Gowachin of Frank Herbert's stories
• Great Race of Yith (H. P. Lovecraft)
• Hutts (Star Wars)
• Hynerians (Farscape)
• Jem'Hadar (Star Trek)
• Lithians of James Blish's A Case of Conscience
• Omicronians / Popplers (Futurama)
• Protoss (Starcraft)
• Sea Devils (Doctor Who)
• Rodians (Star Wars)
• Sheyangs (Farscape)
• Silurians (Doctor Who)
• Skrulls (Marvel Comics)
• Snarks (Marvel Comics)
• Trandoshans (Star Wars)
• Unas Stargate SG-1
• Vaadwaur (Star Trek)
• Velantians (Lensman books) notable for their multiplicity of eyes and various appendages
• Voth (Star Trek). This species descended from Earth dinosaurs
• Xindi (Star Trek)
• Yautja (Predator)
• Yilane of West of Eden series of Harry Harrison

• and various variations of dinosaurs

Aquatic species

• Babel fish (Douglas Adams)
• Gungans (Star Wars)
• Mon Calamari (Star Wars)
• Quarren "Squid Heads" (Star Wars)
• The Vortex life forms (Ecco the Dolphin; assumed to be aquatic)
• Xindi (Star Trek)

Parasites and symbionts

• the "body snatcher pods" from Invasion of the Body Snatchers
• Energy Rider (Farscape)
• Goa'uld of Stargate SG-1
  • Tok'ra of Stargate SG-1
• 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 Invid (Robotech)
• Iskoort (Animorphs)
• Symbiote (Venom and Carnage of Marvel Comics)
• Trills (Star Trek)
• the Wirrn, Krynoid, and Fendahl of Doctor Who
• Yeerks (Animorphs)
• X Parasites (Metroid)

Robotic and Mechanical Aliens

Aliens that are created through technological means. This category also inculdes lifeforms that have been altered so that their existance depends on implants and other technologies.

• Autons (Doctor Who)
• Berserkers (Fred Saberhagen's Berserker series)
• Borg (Star Trek)
• Bynars (Star Trek)
• Cybermen (Doctor Who)
• Cylons (Battlestar Galactica)
• Daleks (Doctor Who)
• Necrons (necrontyr given imortality by the c'tan) (Warhammer 40,000)
• Phalanx (Marvel Comics)
• Replicators (Stargate SG-1)
• Technarchy (Marvel Comics)
• Transformers
  • Autobots
  • Decepticons
  • Maximals
  • Predacons
  • Vehicons

Space-Living Creatures

• Budong (Farscape)
• Gomtuu (Star trek)
• Leviathan (Farscape)

Sentient Plants & Fungi

• The Cotati (Marvel Comics)
• Delvians (Farscape)
• Deathworld Flora (found on planets like Catachan and Caliban(pre climactic explosion)) (Warhammer 40,000)

Ancient Races

Aliens that have either disappeared and left only ruins or developed to godlike, practically omnipotent entities.

• Unnamed and unseen aliens in 2001: A Space Odyssey
• Ancients (Farscape)
• Ancients (Stargate)
• The Arisians and Eddorians of E. E. Smith's Lensman novels
• Chozo (Metroid)
• Cocytans from Lucasarts' The Dig
• Furlings (Stargate SG-1)
• Heechee of Frederik Pohl
• Iconians (Star Trek)
• Krork (Warhammer 40,000)
• Necrontyr (Warhammer 40,000)
• Nox (Stargate SG-1)
• August Derleth's Elder Gods
• 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)
• Old ones (Warhammer 40,000)
• Organians and Progenitors (Star Trek)
• Protoculture (Macross)
• Shadows (Babylon 5)
• T'kon (Star Trek)
• Vorlons (Babylon 5)
• Xel'Naga (Starcraft)

More unusual forms

• Abyormenites of Hal Clement's Cycle of Fire (floating ballons - one race, that is)
• Black Cloud of Fred Hoyle (interstellar dust cloud)
• the Caleban of Frank Herbert's Whipping Star (invisible telepathic beings who are actually the minds of stars)
• C'tan (as above, woshipped and given corporial form by the Necrontyr, only 4 still exist and only two of those the Nightbringer and the Deceiver are awake, Mars (The Void Dragon) is actually one that was covered by space dust over trillions of years ago)(Warhammer 40,000)
• 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.
• the Doublers, two-in-one semi-humanoids of Stanislaw Lem's Eden
• Drej , a race reponsible for the destruction of Earth; made out of pure energy, Titan A.E.
• Dugs (Star Wars)
• Father (Animorphs) an intelligent entity formed from a network of algae and alien corpses spread across an ocean planet.
• Ego the Living Planet (Marvel Comics
• the Gladifers of Dennis Paul Himes
• Gadmeer who live in a sulfur environment. (Stargate SG-1)
• Ghroth (Ramsey Campbell's short story "The Turning")-Small, sentient planet with a large eye
• Hivers of Traveller RPG (modified starfish)
• Horta (Star Trek)
• Meehooks from the comic book series Fusion, "dinosaurs with fur"
• Ly-Cilph (Night's Dawn Trilogy)
• Methorians of Barrington J. Bayley's Zen Gun (gaseous giant-giant dwellers)
• Oankali of Octavia Butler's Xenogenesis series
• Prophets (Star Trek)
• Puppeteers of Larry Niven's Ringworld and Known Space series (three legs, two manipulative heads)
• Rigellians (Lensman books) which are barrel-shaped with four tentacular arms and four stubby legs
• The Scrin of Command & Conquer, an intelligent species of unknown form which are apparently symbiotic with the crystal, root and spore, Tiberium.
• Shoggoths (H. P. Lovecraft)
• Solaris by Stanislaw Lem (living planet)
• Zebesian Space Pirates (Metroid — the species has a wide range of morphological variety)
• Tholians (Star Trek)
• Tralfamadorians of Kurt Vonnegut (The Sirens of Titan, Slaughterhouse 5)
• Treecats - Six-limbed cats(Honor Harrington Series)
• Trillions of Nicholas Fisk (small collective crystals)
• Watchers in the dark (highly telepathic and thus invincible creatures who inhabit the rock Home of the Dark angles Space marines chapter) (Warhammer 40,000)
• Yag-Kosha, from Robert E. Howard's Tower of the Elephant (humanoid elephant)
• Aliens that are product of mechanical evolution in The Invincible by Stanislaw Lem

Shape-shifting aliens

• Aylee - (Sluggy Freelance) - Shapeshifts every stage of the lifecycle
• Changelings (Star Trek)
• Rutans (Doctor Who)
• The Skrulls (Marvel Comics)
• Time Lords/Gallifreyans (Doctor Who)-see Regeneration

Unintelligent Creatures

• Banthas (Star Wars)
• The Colour Out of Space by H. P. Lovecraft (disputed)
• Sandworm (Dune)
• Tribbles, from Star Trek; compare
  • Flat Cats from Robert A Heinlein's Space Family Stone book

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)
• Daemons/Daemonetts (Warhammer 40,000)
• Digimon of Digimon
• The D-Reaper from Digimon (Toei Animation)
• The Digi-Gnomes from Digimon (Toei Animation)
• Khorne (Warhammer 40,000)
• The Krith of Richard C Merediths Timeliner Trilogy
• Nurgle (Warhammer 40,000)
• Q (Star Trek)
• Qwardians (DC Comics)
• Servitors of the Outer Gods (H.P. Lovecraft)
• Slaaneesh (Warhammer 40,000)
• Species 8472 (Star Trek)
• Sphere Builders (Star Trek)
• Tzeentch (Warhammer 40,000)
• Unnamed telepathic aliens of
• Warp entities (Warhammer 40,000)

Galactic communities

Interstellar governments or communities in which several alien civilizations interact:

• Babylon 5's Babylon Project and latter the Interstellar Ailliance
• The Borg Collective (Star Trek)
• The Covenant (Halo: Combat Evolved, Halo 2)
• The ConSentiency (Frank Herbert's The Dosadi Experiment)
• Galatic 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 and Republic
• The Empire of man (Warhammer 40,000)
  • Ultramar (Sub-unit of the Empire of man ) (Warhammer 40,000)
• The Tau Empire (Warhammer 40,000)
• The Eye of Terror (Home of many legions of Chaos Space Marines)

See also

• Index of fictional species
• List of fictional robots
• List of fictional planets
• List of species in fantasy fiction
• Xenobiology
• Cryptozoology

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