Director: David Fincher
- Michael Biehn [Dwayne Hicks]
- Paul Brennen [Troy]
- Ralph Brown [Aaron]
- Niall Buggy [Eric]
- Carl Chase [Frank]
- Clive Mantle [William]
- Charles Dance [Clemens]
- Phil Davis [Kevin]
- Charles S. Dutton [Dillon]
- Christopher Fairbank [Murphy]
- Christopher John Fields [Rains]
- Brian Glover [Andrews]
- Peter Guinness [Gregor]
- Lance Henriksen [Lance Bishop]
- Leon Herbert [Edward Boggs]
- Paul McGann [Golic]
- Holt McCallany [Junior]
- Vincenzo Nicoli [Jude]
- Deobia Oparei [Arthur]
- Pete Postlethwaite [David]
- Tom Woodruff, Jr. [Alien]
- The film spent over a year in editing.
- The production effectively shut down for three months while the script was undergoing rewrites.
- At one point, David Fincher was denied permission by the film's producers to shoot a crucial scene in the prison understructure between Ripley and the alien. Against orders, Fincher grabbed Sigourney Weaver, a camera and shot the scene anyway. This scene appears in the final cut.
- Lance Henriksen only agreed to reprise his role as Bishop as a personal favor to Walter Hill. To this day, Henriksen has said he dislikes the film for its nihilistic themes.
- Michael Biehn stated in an interview that he was deeply hurt that the film opened with his character from Aliens (1986), Corporal Dwayne Hicks, being killed off, after escaping with Ripley, Newt and Bishop at the end of the previous film, and did not understand why Hicks had to die. He therefore refused the studio permission to use a dummy of a corpse in his likeness, but allowed them the use of his photograph.
- First-time director David Fincher disowned the film, stating in 2009 that "to this day, no one hates it more than me". He cited constant studio interference, and actually walked out of production when the studio ordered re-shoots. He was not involved with final editing, but he had delivered a rough cut that became the basis for the 'Assembly Cut', a longer version of the movie later released on DVD and Blu-ray. Fincher did not personally work on this Assembly Cut, and stated that he has no comments on it, as he has never seen it.
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