"If space is hell, this planet is worse."
Rumor Control (from Alien: The Roleplaying Game)

Xenomorph Prime,[1] also known as G-435,[2] Achilles 2.4,[2] Hiveworld,[3] Homeworld,[4] or A6 454 by some human scientists, was the fourth planet orbiting the star Achilles 2, located in the Achilles System 61.4 light years Rimward-Trailward from Earth. It was a major Xenomorph hiveworld, and home to several other alien species.



Hidden by twin binary stars, Xenomorph Prime was at least the size of Earth and possessed three major continents and a small ocean.[5] While the Xenomorph population on Xenomorph Prime was ultimately determined to not be indigenous, it was unknown how they arrived there in the first place; whether they were intentionally imported, or part of an experiment that had gotten out of control, or from a crashed ship, was academic. Regardless, the Xenomorphs made the world their own and built a number of gigantic Hives, at least one of which housed a Queen Mother.[6]

Flora and fauna[]

While the planet featured very minimal vegetation,[2] it hosted indigenous lifeforms, with several avian, mammal or reptile species most likely to play host for the Xenomorphs;[6] however, an unnamed species was known to compete with the Xenomorphs, thus becoming their only natural predator. The Xenomorphs on G-435 were stronger and quicker than their off-world counterparts, with some appearing to have exoskeletons of varying hues. This quirk may have signified hive allegiance; it was theorized that the color shift was a byproduct of chemical pheromones released in the presence of other hives.[6] Several Xenomorph types were known to live here such as Facehuggers, Royal Facehuggers, Chestbursters, Crushers, Praetorians, Queens, Empress, Palatines and Queen Mothers. Human and Predator-spawned Drones as well as Runners were not in evidence, due to a lack of such hosts.

Locked in a constant state of dusk, the climate was hot and humid, and the atmosphere was breathable for humans.[2] While the terrain was mostly flat, the planet was covered with shallow salty seas and swamps, and desert wastelands.[2] The areas overrun by Xenomorphs were also covered with Hive resin. G-435's scant resources amounted to little more than Royal Jelly and Xenomorphs.[2]


Prior to physical exploration of the planet, research based on a Xenomorph in captivity on Earth led Dr. Waidslaw Orona to speculate about its homeworld in a report titled Theory of Alien Propagation.

For many years, the Yautja kidnapped facehuggers from Queens and took them offworld to spread on other planets in order to breed Xenomorphs for hunting. In the 2190s, an expedition led by Billie, Wilks and a synthetic of Ellen Ripley landed on the planet to abduct the Queen Mother,[7] starting a civil war between two young Queen Mothers.[8] An expedition led by billionaire Daniel Grant to retrieve Royal Jelly in order to synthesize a highly addictive drug called Xeno-Zip landed in the middle of this schism and nuked the Red Xenomorph hive, killing the Red Queen Mother; queenless, the rest of the Red Xenomorphs were eradicated by the opposing blacks.[9] At some point, the Yautja Dark and his clan headed to the planet for their greatest hunt yet, followed by the Weyland-Yutani Corporation, Specimen 6 was seen being transported off BG-386 on board a vessel of Weyland-Yutani design.[10]

Behind the scenes[]

Xenomorph Prime, or the Alien/Xenomorph Homeworld, is dealt with in the four first Aliens comics series and in the 2010 video game Aliens vs. Predator.

Some different examples of its habitats are shown in the comics, including mountainous terrain (Aliens: Book 1), desert-like steppes with some greenery (Aliens: Genocide), swamps (Aliens: Female War, Aliens: Genocide) and caves (Aliens: Genocide). Also, some examples of other Xenomorph Prime indigenous species are also shown in these series. There are about four different examples of hives shown in each of the locales.

Queen Mothers: On the issue of the Queen mother of Xenomorph Prime. As per the comics, there was a sort of "super" (not the word used for it in the comics) Queen Mother on the planet that was sending signals out to all the Aliens, at least the ones who had taken over the earth, including the Queens on earth—her signals were also being received somehow by the synthetic Ellen Ripley. This one was captured at its swamp-like hive by Wilks, Billie and the Ripley synthetic, brought back to earth and destroyed. This did serious harm to the Aliens on Earth but did not wipe them all out (all of this information from Aliens: Female War).

Meanwhile back on the Xenomorph homeworld, once the Super Queen was dead, the Royal Guards split into two factions with two newborn Queens (one red-colored and one black, though the comics editors have said the coloring was just to be able to tell apart the factions and didn't necessarily need to be taken as literal). This lead to a genocidal war between the two factions (red and black) of Xenomorph on the homeworld (this according to Aliens: Genocide). After the earth had been reclaimed from the Xenomorphs (which took about two years according to Aliens: Crusade), a Grant Corporation mission to the homeworld sent to try and capture one of the Queens disrupted the war, killing one of the Queens. Meanwhile, Xenomorphs and their hives continued to dot the cosmos.

Hives: The mountainous, temple-like hives on Xenomorph Prime were first depicted in Aliens: Book One. The design was reused in the first AVP comics series for a hive on another planet, then multiple other Aliens comics (such as Aliens: Hive and Aliens: Labyrinth), and eventually in the AVP 2010 video game. The construction of such a hive was shown in Aliens: Theory of Alien Propagation.

Another form of the Alien hive, made up of four pod-like spherical structures connected via rocky tethers in swamp-like area, was first introduced in Aliens: Female War as the home of the Queen Mother and shown again in Aliens: Genocide. The construction of such a hive was shown in Aliens: Genocide.


  • The name Xenomorph Prime, as well as Yautja Prime, were coined by Kenner's Predator and Aliens lines of 1994 Hive Wars action figures.
  • According to the novel Aliens: Genocide, the Red Xenomorphs were not literally "red", but black like a typical xenomorph. However, they were considered red by the original strain, but were indistinguishable to human observers.
  • It's commonly believed that director Ridley Scott was against the idea of a "Xenomorph homeworld" since he has stated that the Xenomorph have no homeworld due to being an artificial race.


Non-canon appearances[]