In November 2005 Fox released an 'Unrated Edition' which runs nearly 8 minutes longer than the theatrical version. It features deleted plot and character scenes. It also has some alternative footage and added CGI blood effects. The story is better told. The violence and gore are stronger than in the PG-13 theatrical version.
The original DVD had an additional deleted sequence: It shows a whaling station in 1904, and a whaler is being chased. He enters a building and tries to hide. As the camera cuts to the "Predator vision" though, it is clear that the hunter is chasing an Alien in the same room, which lunges at the camera. This sequence is approx. 1 min. 30 sec. in duration and now included in the 'Unrated Edition'.