Thedus is a mining world planet located in the Epsilon Reticuli System approximately 59 light years Trailward from Earth.[1]

Population: 2,000,000[2]


Firstly mistaken as a small gas giant, it was revealed that the planet was actually a terrestrial planet full of heavy metal veins that were quickly and heavily exploited by Weyland-Yutani for more that a century leaving several sections of the planet with huge gouges and deep canyon trenches. It became at some point a transit point, alongside Anchorpoint Station, for exported materials from the Far Frontier to the Outer Veil and Core Systems.[2]

In 2109, the planet suffered a severe environmental accident that render parts of the planet uninhabitable for decades, followed by a miners' revolt over a poor living conditions. This forced United Americas to send the UAS Archangel, a UAORD troopcarrier captained by Arthur Dallas, on a peacekeeping mission to Thedus,[2] on December 25th[3] for unknown classified reasons the Archangel crashed on one atmospheric processor destroying it and killing 15,293[3] civilians and marines.[2]

In 2121 Thedus was the last port of call of the commercial towing vehicle USCSS Nostromo before the ship went missing in 2122.[2] As of the 2180s most of the planetary damages were repaired via newed terraforming.[2]

Climate and Terrain

The climate before the environmental accident is unknown but after the planet was "repaired" it holds a cold atmosphere breathable for humans with a mean temperature of 8°C.[2]

The whole planet is mainly terrestrial with heavy metal depostits.[2]


Key resources: Yttrium, nobium, helium-3 and other rare earth metals.[2]

Points of Interests

A United States Colonial Marine Corps's Eridani Marine Space Force garrison is stationned on the planet.[4] Weyland-Yutani Corporation have one of its main offices on Thedus.[5]




  1. Andrew E. C. Gaska. Alien: The Roleplaying Game Galaxy Map (2019), Free League Publishing.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Andrew E. C. Gaska. Alien: The Roleplaying Game, p. 270 (2019), Free League Publishing.
  3. 3.0 3.1 Nostromo crew manifest, available as an Easter Egg on Alien Legacy DVD box set
  4. Lee Brimmicombe-Wood. Aliens: Colonial Marines Technical Manual, p. 8 (2012), Titan Books.
  5. Alien Anthology Blu-ray menus
  6. Lee Brimmicombe-Wood. Aliens: Colonial Marines Technical Manual, p. 9 (2012), Titan Books.
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