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 10
Galvanic MechomorphBen 10
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 Whowraith-like humanoids
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"). (join the fandom) All gems are genderless but are feminine in appearance and use female pronouns. The race gets all their energy from the gem that they poses randomly on their body, depending on the placement of the gem virtues the Gem's personalty, example, the gem is on the forehead that makes them smart. They demolish all life on a planet to repopulate, as shown in "How are Gems made" they take all the nutrients from the ground and emerge from the earth as a fully formed gem. They have their own planet where they originated from. They also have four rulers, the Diamonds.
Geochelone AerioBen 10
GeonosianStar Wars
GethMass Effect
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 inslaved 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 WarsA pround race who speak very bad English. Meesa no tink dat! (Jaja)
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