The movie starts right at the end of the second film where Ellen Ripley and survivors start to travel back home. But unfortunately they crash land on some prison planet and Ripley discovers that her companions are already dead because of the Alien. Now the nightmare starts again as the Alien is beginning to kill some of the inhabitants of the prison.
Continuity mistake: Just after the doctor started the post mortem on that little girl, the front of his gown is covered with blood. Yet, a few seconds later, after the two other guys appeared, his gown looks better, with less blood. And during the whole post mortem scene, the blood spot actually changes its size a few times. (00:17:55 - 00:19:55)
Trivia: The plot of the movie is a combination of two spec scripts written for the film - one was by David Twohy (Riddick) who wrote a script set on a prison planet, and another by Vincent Ward, set on a monastery planet with the same characters and basic plot. Despite this, neither received credit for the screenplay (Although Ward received story credit).
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