List of fictional alien species: G

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Name Source Notes
Gadmeer Stargate SG-1
Gaim Babylon 5
Galactoids Superjail! A race of party creatures.
Galactus Marvel Comics
Galaxoid Calvin and Hobbes
Gallaxhar Monsters vs. Aliens Believed to be a space squid, since he stated he was "but a squidling" when he was young.
Galvan Ben 10 Small, grey, frog-like humanoids from Galvan Prime, Galvans are exceptionally intelligent, especially in inventing and innovation.
Galvanic Mechomorph Ben 10 Made of a liquid-metal like nanotechnology, Galvanic Mechamorphs, which live on Galvan Prime's moon Galvan B, can fuse with technology and increase the tech's technical capabilities, and can replicate any technology they have previously augmented with due to their shapeshifting abilities.
Gamilons/Gamilus Space Battleship Yamato/Star Blazers Humanoid
Gamorrean Star Wars Rotund, pig-like humanoids
Gand Star Wars
Ganymean James P. Hogan's Giants Series Large technologically advanced humanoids
Gaoul Titan A.E. Leathery-winged, pterosaur-like aliens. Native to Sesharrim.
Garthlings David Brin's Uplift Universe
Gashlai Twilight Imperium Organized as "Embers of Muaat"; burning beings whose metabolism is based on a unique energy-to-mass conversion
The Gelth Doctor Who wraith-like humanoids
Gedd K. A. Applegate's Animorphs
GELF Red Dwarf Genetically 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.
Gelgameks South Park Toad-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.
Gemini Battlelords of the 23rd Century
Gems Steven Universe Sentient rocks that project a human-like form (described as "a hologram with mass"). 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 Aerio Ben 10 A peaceful, philosophical race of turtle-like creatures from the planet Aldabra in the Andromeda Galaxy, Geochelone Aerio 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.
Geonosian Star Wars
Geth Mass Effect
Gethenians Ursula K. Le Guin's Ekumen stories) and other races
Ghamans Perry Rhodan
Ghosts Nexus: The Jupiter Incident
Gibis Les Shadoks
Gigan Godzilla films
Giygas EarthBound
Gigglepies The Fairly OddParents Rabbit-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 Men X-COM: Terror from the Deep
G'keks David Brin's Uplift Universe
Gladifers Dennis Paul Himes
Glapum'tians Valérian and Laureline
Glendaliens Bravest Warriors A 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.
Gloarft Megas XLR
Gnaar Serious Sam: The First Encounter
Gnolams Master of Orion II
Gnosis Xenosaga
Goa'uld Stargate SG-1 A parasitic race which burrow into their hosts neck and possess them. They pose as Gods to humans.
Godan Imperium Galactica II: Alliances
Gonknoids Phil of the Future
Gonzo The Muppets A member of a fun-loving and musical race who was lost on Earth and later found by his family.
Goola-Goola Battlelords of the 23rd Century
Gorlocks Win, Lose and Kaboom
Gorg Nexus: The Jupiter Incident
Gorn Star Trek
Gort The Day the Earth Stood Still
Goszuls Perry Rhodan
Gourmand Ben 10
Govorom Ascendancy
Gowachin Frank Herbert's ConSentiency universe)
G.R.A.I.S.E. Melonpool
Grans Star Wars Humanoid
The Graske Doctor Who and The Sarah Jane Adventures Small Humanoid
Great Race of Yith H. P. Lovecraft
Grendarl Master of Orion III
Grendlers Earth 2 Intelligent bipedal species known for their scavenging, hoarding, and trading. Though not a violently aggressive species they are very fond of human blood.
Gretchin/Grotz Warhammer 40,000 Humanoid
Grey alien popular mythology
Grogs Larry Niven's Known Space
Grudeks Farscape Humanoid
Grue Pitch Black Humanoid
Grunds Marvel Comics Humanoid
Grundos Neopets Cute Alien who lived on the moon of Neopia.
Grunts (Unggoy) Halo Short creatures, mostly used as fodder for bigger creatures in Covenant. Breath a gas native to their homeworld.
Guardians of the Universe DC Comics Humanoid
Gubru David Brin's Uplift Universe
Gungans Star Wars A pround race who speak very bad English. Meesa no tink dat! (Jaja)