List of fictional alien species: G

NameSourceNotes
GadmeerStargate SG-1
GaimBabylon 5
GalactoidsSuperjail!A race of party creatures.
GalactusMarvel Comics
GalaxoidCalvin and Hobbes
GallaxharMonsters vs. AliensBelieved to be a space squid, since he stated he was "but a squidling" when he was young.
GalvanBen 10Small, frog-like humanoids from Galvan Prime, Galvans are exceptionally intelligent, especially in inventing and innovation.
Galvanic MechomorphBen 10Made of a liquid-metal like nanotechnology, Galvanic Mechamorphs can fuse with technology and increase its technical capabilities, and can replicate any technology they have previously augmented with. They live on Galvan Prime's moon, Galvan B, and were created due to a Galvan terraforming experiment.
Gamilons/GamilusSpace Battleship Yamato/Star BlazersHumanoid
GamorreanStar WarsRotund, pig-like humanoids
GandStar Wars
GanymeanJames P. Hogan's Giants SeriesLarge technologically advanced humanoids
GaoulTitan A.E.Leathery-winged, pterosaur-like aliens. Native to Sesharrim.
GarthlingsDavid Brin's Uplift Universe
GashlaiTwilight ImperiumOrganized as "Embers of Muaat"; burning beings whose metabolism is based on a unique energy-to-mass conversion
The GelthDoctor WhoGaseous humanoids, they can either exist in gaseous mediums (such as gas pipes in Victorian Households) or inside the corpses of others.
GeddK. A. Applegate's Animorphs
GELFRed DwarfGenetically Enhanced Life Form — a wide variety of artificial 'aliens' created by human scientists. Some are humanoid, others are not. All life seen in the Red Dwarf universe originated on Earth, there are no true aliens of extraterrestrial origins.
GelgameksSouth ParkToad-like with slimy green skin and large eyes. Females are claimed to have vaginas that are three feet wide and filled with razor-sharp teeth. Gelgameks also represent the Roman Catholic Church.
GeminiBattlelords of the 23rd Century
GemsSteven UniverseSentient rocks that project a human-like form (described as "a hologram with mass"). Gems are not sexually dimorphic but are feminine in appearance and are addressed as women. They demolish all life on a planet to repopulate,; as shown in the "How Are Gems Made?" short, they take all the nutrients from the ground and emerge from the earth as a fully formed gem.
Geochelone AerioBen 10Peaceful, philosophic turtle-like creatures from the planet Aldabra in the Andromeda Galaxy, Geochelone Aerios can unleash powerful torrents of wind from the holes in their torso and control air in other ways, and they are immune to magic and attacks based on mana, or life energy.
GeonosianStar Wars
GethMass EffectArtificially intelligent robots created by the quarians, geth (which means "Servant of the people" in the quarian language Khelish) were meant to be a labor race, but as they became more sentient, they began questioning their existence and the quarians decided to shut them down before they could revolt, causing war between the geth and the quarians. The geth won, forcing the quarians to evacuate their planet. While most geth decided to stay on their planet and try to achieve their goal of a device that would house the entire geth consciousness, a small sect allied themselves with the villainous Reapers.
GetheniansUrsula K. Le Guin's Ekumen stories) and other races
GhamansPerry Rhodan
GhostsNexus: The Jupiter Incident
GibisLes Shadoks
GiganGodzilla films
GiygasEarthBound
GigglepiesThe Fairly OddParentsRabbit-like aliens, all of them (both male and female) having floppy ears, a small heart-shaped nose, large shiny eyes, and a round head. They spread across entire planets by posing as the "Special Surprise Inside" a box of "Invader O's" cereal. After they enslave a planet, sell their merchandise, and suck it dry, they blow it up and move onto another planet.
Gill MenX-COM: Terror from the Deep
G'keksDavid Brin's Uplift Universe
GladifersDennis Paul Himes
Glapum'tiansValérian and Laureline
GlendaliensBravest WarriorsA species of slime-like creatures. After The Great Time Catastrophe, the Glendaliens created a machine to keep time running. After the machine broke down and began looping time, it is unknown what happened to the Glendaliens on the Moon of Glendale.
GloarftMegas XLR
GnaarSerious Sam: The First Encounter
GnolamsMaster of Orion II
GnosisXenosaga
Goa'uldStargate SG-1A parasitic race which burrow into their hosts neck and possess them. They pose as Gods to humans.
GodanImperium Galactica II: Alliances
GonknoidsPhil of the Future
GonzoThe MuppetsA member of a fun-loving and musical race who was lost on Earth and later found by his family.
Goola-GoolaBattlelords of the 23rd Century
GorlocksWin, Lose and Kaboom
GorgNexus: The Jupiter Incident
GornStar Trek
GortThe Day the Earth Stood Still
GoszulsPerry Rhodan
GourmandBen 10
GovoromAscendancy
GowachinFrank Herbert's ConSentiency universe)
G.R.A.I.S.E.Melonpool
GransStar WarsHumanoid
The GraskeDoctor Who and The Sarah Jane AdventuresSmall Humanoid
Great Race of YithH. P. Lovecraft
GrendarlMaster of Orion III
GrendlersEarth 2Intelligent bipedal species known for their scavenging, hoarding, and trading. Though not a violently aggressive species they are very fond of human blood.
Gretchin/GrotzWarhammer 40,000Humanoid
Grey alienpopular mythology
GrogsLarry Niven's Known Space
GrudeksFarscapeHumanoid
GruePitch BlackHumanoid
GrundsMarvel ComicsHumanoid
GrundosNeopetsCute Alien who lived on the moon of Neopia.
Grunts (Unggoy)HaloShort creatures, mostly used as fodder for bigger creatures in Covenant. Breath a gas native to their homeworld.
Guardians of the UniverseDC ComicsHumanoid
GubruDavid Brin's Uplift Universe
GungansStar WarsAn aquatic adapted species. They are masters of underwater combat, are fairly fast swimmers, and are proud warriors.
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