"Alien: FUZION” is a Role Playing Game using the FUZION rules created by R. Talsorian Games and Hero Games. It is not a hack / slash gunfest like other adaptations. This one attempts to make a detailed setting where the characters can have many adventures that not even have to include the name species of the series.
The FUZION game system can be downloaded in its entirety from the FUZION home page but you will need the PDF viewer. Go to the Waystation from this site to go to those locations.