List of fictional alien species: G
| 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 | |
| Galvanic Mechomorph | Ben 10 | |
| 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. |
| Geochelone Aerio | Ben 10 | |
| 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 | |
| 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) |
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