Obsidian Entertainment er kendt for at have stået bag en række storslåede rollespil, og på et tidspunkt arbejdede de på deres version af en episk rumopera, nemlig Alien: Crucible baseret på Ridley Scott-filmserien.
Spillet blev dog aflyst, men der tidligere har arbejdet på projektet beskriver det som et "terrifying" Mass Effect. I et interview med VG247 siger tidligere Obsidian-ansat Chris Avellone:
<em>"A rough comparison would be Mass Effect but more terrifying. "We wanted to make it. But by that point Sega, I think, was... the publisher/management relations had gotten to a point where they were just tired of dealing with [Obsidian]. Everyone working on Aliens: Crucible was really excited about it. It was shaping up to be a really cool game. The prototype was really cool. But then Sega's like 'nope!'"
Nu hvor Obsidian er ejet af Microsoft er sandsynligheden for at projektet genopstår nok ganske lille desværre.