One of my all time favourite films. Its still intense and enjoyable even today. And your heart still races even though you know exactly what's coming next.
Facehuggers still give me nightmares from time to time.
All the characters are so awesome - Ripley, Hicks, Bishop, Apone, Gorman, Ferro, Dietrich, Spunkmeyer, Vasquez, Drake, Frost, Crowe, Wierzbowski, Burke, Newt. But Hudson especially (played by Bill Paxton) is the absolute star for me - his acting is superb and all his lines memorable.
A true classic!