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This is a List of fictional extraterrestrials by physical features or form.

§Ancient races



See also List of fictional ancient extraterrestrial species.

§Aquatic creatures



See also List of aquatic alien species.

§Amorphous/Gaseous creatures



See also Amorphous creature.

  • 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.
  • Beta Renner cloud (Star Trek)
  • Black Cloud (Fred Hoyle) (interstellar dust cloud)
  • "Blob" (The Blob)
  • Dark Matter - One eyed possessing black clouds in space in the Kirby series.
  • Dikironium cloud - Intelligent "vampire cloud" (Star Trek)
  • Dralasite - An amoeboid race introduced in Star Frontiers
  • Dubtak, sperm cell-like creatures (Ascendancy)
  • Gelth, intelligent gaseous lifeforms; were once solid, but were altered as a result of the Time War (Doctor Who)
  • Ghatanothoa of H. P. Lovecraft (has Gorgon-like visual properties)
  • The Invaders, higher-dimensional beings originating from a gas giant. (Eight Worlds)
  • Polymorph (Ben 10: Alien Force)
  • Nestene Consciousness (Doctor Who), a race of large amorphous creatures made of living plastic, and are thus capable of controlling all things made from plastic
  • Nimbuloids, a species of large sentient gas creatures (Ascendancy)
  • Shoggoths (H. P. Lovecraft)
  • Trisolian, humanoid creatures made out of liquid (Futurama)
  • Umgah, large, pink or lilac-colored blobs (Star Control)

§Energy beings



See also Energy being.

  • Celareon, energy beings encased in metal bodies. (Conquest: Frontier Wars)
  • Drej (Titan A.E.)
  • Eldila, barely visible faint, shifting light that are native to interplanetary space. (Space Trilogy)
  • Father - an intelligent sponge-like entity formed from a network of algae and alien corpses spread across an ocean planet. (Animorphs)
  • Prypiatosian-B (Ben 10: Ultimate Alien)
  • Zoni (Ratchet & Clank)
  • Wisp, colorful little aliens that give you amazing abilities, they are from Sonic Colors

§Extra-dimensional beings



  • Ancient (after Ascension) - Stargate
  • Combine "Advisor" aka Shu'ulathoi from Half Life 2 (Half-Life)
  • Imp (DC Comics)
  • Annihilus (Marvel Comics)
  • The Anti-Monitor (DC Comics)
  • Arilou (Star Control)
  • Bakugan (Bakugan)
  • Blastaar (Marvel Comics)
  • Celestial Toymaker (Doctor Who)
  • Chaos God (Warhammer 40,000)
  • Daemon (Warhammer 40,000)
  • Hounds of Tindalos - Mysterious, angular, timeless beings with no accurate given description. (Frank Belknap Long)
  • Krang (Teenage Mutant Ninja Turtles)
  • Krith (Timeliner)
  • Lawbringers (Crossgen)
  • Magolor (Kirby's Return to Dream Land)
  • nDs (Invasion: Earth)
  • Orbulon (WarioWare)
  • Orz (Star Control)
  • Q (Star Trek)
  • Qwardian (DC Comics)
  • Reaper (Doctor Who)
  • Sau-Bau (Battlelords of the 23rd Century)
  • Servitors of the Outer Gods (H. P. Lovecraft)
  • Species 8472 (Star Trek)
  • Sphere Builder (Star Trek)
  • The Spineless Ones (Marvel Comics) - see also Mojo
  • Technet (Marvel Comics)
  • The Voice in the Darkness (Starcraft)
  • "Them" (The Homeward Bounders by Diana Wynne Jones)
  • Unnamed telepathic aliens of Babylon 5: Thirdspace
  • Warwolves (Marvel Comics)
  • Warp entities (Warhammer 40,000)
  • Zoni (Ratchet & Clank)

§Immaterial/Incorporeal beings



  • The Animus, a telepathic alien intelligence with a corporeal form resembling an octopus (Doctor Who)
  • Caleban - invisible telepathic beings who are actually the minds of stars (Whipping Star)
  • Celestialsapien (Ben 10: Alien Force)
  • Cosmic entities (DC Comics)
  • Cosmic entities (Marvel Comics)
  • C'tan - 'Star Vampires' worshiped 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)
  • Dnyarri, non-humanoid Telepaths (Star Control)
  • Ectonurite (Ben 10)
  • Grog - conical sessile sentient telepaths (Known Space)
  • Govorom - Feminine-like spirits of nature (Ascendancy)
  • Hooloovoo, non-corporeal beings, when refracted in a prism, appear as a shade of blue. (The Hitchhiker's Guide to the Galaxy)
  • Humanoid Interface (Haruhi Suzumiya)
  • The Loki - A race of malevolent spirits that require hosts to survive. (Ratchet & Clank)
  • Ly-Cilph - begin their lives as corporeal, but can latter become non-corporeal being. (Night's Dawn Trilogy)
  • "Phantoms" - a ghost-like race from. (Final Fantasy: The Spirits Within)
  • Magius (Valvrave the Liberator)
  • Medusan, an incorporeal race that cannot be looked at by humanoids, or their appearance will drive you insane (Star Trek)
  • Prophet (Star Trek)
  • Q (Star Trek)
  • Watchers In The Dark (highly telepathic creatures that inhabit the ruins of Caliban, home of the Dark Angels Space Marine Chapter) (Warhammer 40,000)

§Inorganic life



  • Aliens that are product of mechanical evolution (The Invincible)
  • Blue Meanies, armoured creatures that live on Mother, created to care for her (Remnants)
  • Chenjesu - intelligent silicon-based crystals (Star Control)
  • Crystalsapien (Ben 10: Alien Force)
  • Horta - silicon-based tunneler. (Star Trek)
  • Ogri - silicon-based life form resembling standing stones (Doctor Who)
  • The Scrin - an intelligent species of unknown form which are apparently symbiotic with the crystal, root and spore, Tiberium. (Command & Conquer)
  • Segmentasapien (Ben 10: Omniverse)
  • Sonorosian (Ben 10: Alien Force)
  • Shevar - an inorganic race from an alternate universe that feeds on life force. (Ascendancy)
  • Silicoid - a race of sentient crystals. (Master of Orion)
  • Sphere (Sphere)
  • Gadmeer - Beings that live in a sulphur environment. (Stargate)
  • Galilean (Ben 10: Omniverse)
  • Tholian (Star Trek)
  • Trillions of Nicholas Fisk - small collective crystals
  • Petrosapien (Ben 10)

§Invertebrates



§Arthropods

See also List of arthropod alien species.

§Cephalopods

  • Ceph - It's theorized that they are not actual beings, but tools of a more advanced race. (Crysis)
  • Edestekai, a tri-lateral primitive race encountered. (Star Frontiers)
  • Mars People, intelligent creatures resembling squids or octopi, sporting a great amount of tendril-like tentacles. (Metal Slug)
  • Martian (The War of the Worlds)
  • Ul-Mor, a race of sentient land-dwelling octopus-like nomads encountered. (Star Frontiers)
  • Zoq-Fot-Pik (Star Control)

§Medusozoans

  • Abyormenite - floating balloons (Cycle of Fire)
  • Amperi (Ben 10: Ultimate Alien)
  • Chronomyst - sentient jellyfish-like creatures that communicate by refracting light within their bodies. (Ascendancy)

§Worms

  • Chtorr - Pink wormlike creatures. According to David, the Chtorr can also refer to the entire alien ecology. (War Against the Chtorr)
  • Harmonia (The Sirens of Titan), a cave-dwelling flatworm-like race living on Mercury.
  • Lekgolo (Halo)
    • Mgalekgolo - Beings composed of multiple Lekgolo worms that, together, form a single, sentient organism. (Halo)
  • Sandworm (Dune)
  • Yuggs (H. P. Lovecraft)

§Others

  • Garrotian Snail (Noon Universe)
  • 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)
  • Hiver (Traveller) (modified starfish)
  • Rigellians (Lensman books) which are barrel-shaped with four tentacular arms and four stubby legs
  • Kambuchka (Ascendancy)
  • Mebes - Giant single-celled sentient organisms. (Ascendancy)
  • Orishan (Ben 10: Ultimate Alien)
  • Spathi, similar to shellfish (Star Control)
  • Destroyah, a mutant crustacean (Godzilla vs. Destoroyah)
  • Thep Khufan - Mummy-like aliens composed completely out of bandages. (Ben 10)
  • Tralfamadorian (The Sirens of Titan, Slaughterhouse 5)
  • Utrom (Teenage Mutant Ninja Turtles)
  • VUX, green tentacular creatures (Star Control)

§Living planets



See also List of fictional living planets.

§Microscopic life



  • The Flood - The LF.Xx.3273 Flood Super Cell is capable of infecting victims on its own. (Halo)
  • Martian - sentient cloudlets composed of countless microscopic particles (Last and First Men)
  • "Thing" (The Thing)
  • Hoth virus (Stargate)

§Non-sapient creatures



See also List of non-sentient alien species.

§Space-living creatures



These fictional creatures purport to thrive in the biome of outer space.

  • Acanti (Marvel Comics)
  • Bentusi (Homeworld)
  • Budong (Farscape)
  • Forerunners (The History of the Galaxy)
  • Farpoint Station (Star Trek)
  • Gomtuu (Star Trek)
  • Leviathan (Farscape)
  • The Lexx race (Lexx)
  • Necrofriggian (Ben 10)
  • Rigelatin (Duke Nukem II)
  • Star Whale (Doctor Who)
  • Oswaft (Star Wars)
  • Outsider (Known Space)
  • Sahaquiel (Neon Genesis Evangelion)
  • To'kustar (Ben 10)

§Shapeshifters



  • Capelons (Ascendancy)
  • Aylee (Sluggy Freelance) - Shapeshifts every stage of the lifecycle.
  • Clawdite (Star Wars)
  • Chameloid (Star Trek)
  • Changeling (Star Trek)
  • Changers (Consider Phlebas)
  • Darlok (Master of Orion)
  • Durlans, the race of Chameleon Boy from the Legion of Super-Heroes (DC Comics)
  • ELS, Extraterrestrial Living-metal Shape-shifter (Mobile Suit Gundam 00 the Movie: Awakening of the Trailblazer) - A race of techno-organic sentient aliens.
  • The Flood (Halo)
  • Green Martian (DC Comics)
  • High Ones (Elfquest)
  • Krillitane (Doctor Who)
  • Limax (Ben 10)
  • Makluan (Marvel Comics) - see also Fin Fang Foom
  • Mangalore (The Fifth Element)
  • Martians (Invincible) - see Shapesmith
  • Mazian (Battlelords of the 23rd Century)
  • Plasmavore (Doctor Who)
  • Rutan (Doctor Who)
  • Silkie (The Silkie)
  • Skrull (Marvel Comics)
  • Star Kings (Star King)
  • Time Lord/Gallifreyan (Doctor Who) - see Regeneration
  • "Thing" (The Thing)
  • Uryuom (El Goonish Shive)
  • White Martian (DC Comics)
  • Zygon (Doctor Who)

§Parasites



See also List of parasitic alien species.

§Plants and fungi



See also List of plant and fungi alien species.

§Robotic life



See also List of robotic alien species.

§Vertebrates



§Avians

  • Chozo (Metroid)
  • Turians (Mass Effect)
  • Kig-Yar (Halo)
  • Pkunk, appear like Toucans (Star Control)
  • Xindi-Avians (Star Trek: Enterprise)

§Humanoids

See also List of humanoid alien species.

§Mammalians

See also List of mammalian alien species.

§Reptilians and amphibians

See also List of reptilian and amphibian alien species.

§Others

  • The Doublers, two-in-one semi-humanoids of StanisÅ‚aw Lem's Eden
  • Dug (Star Wars)
  • The Face of Boe, a giant head in a jar-like support system (Doctor Who)
  • Lloigor (Return of the Lloigor) (Vortices of energy; Solidify as vast, alien reptiles)
  • Logrian (The History of the Galaxy) (two-headed xenomorphs)
  • Osakar - four-legged non-centauroid race of genetically identical individuals. (Star Frontiers)
  • Orfa (Ascendancy)
  • Photino Birds, made up of Dark Matter (Xeelee Squence)
  • Puppeteer, creatures with three legs and two manipulative heads. (Ringworld)(Known Space)
  • Pilots (Farscape)
  • Slitheen (or, more accurately, Raxicoricofallopatorians â€" Slitheen is a family name, not the species), bipedal, vaguely humanoid creatures with sharp claws and baby-like faces, made of living calcium (Doctor Who)
  • Snovemdoma, similar to mammoths. (Ascendancy)
  • Swaparaman (Ascendancy)
  • Spline, whalelike creatures that rebuilt themselves into living ships (Xeelee Squence)

§Others



  • Ark Megaforms (Noon Universe)
  • Conductoid (Ben 10: Omniverse)
  • Dyson Aliens (Peter F. Hamilton's "Pandora's Star")
  • Meehook (Fusion)
  • Giygas (EarthBound) (Mother 2)
  • Melnorme (Star Control)
  • Oankali (Xenogenesis)
  • Pan Spechi, each individual has five different bodies, occupying each one throughout their lifetime. (ConSentiency universe)
  • Precursor (Halo)
  • Mr. Saturn (EarthBound)
  • Taprisiots (Whipping Star, The Dosadi Experiment)
  • Tweel from A Martian Odyssey
  • Zebesian Space Pirates (Metroid series â€" the species has a wide range of morphological variety)

§References





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