Alien-perhaps the greatest ever sci-fi horror, only rivalled by the remake of The Fly or The Thing Aliens-greatest ever sci-fi action film, perfect in every way and for a long time my favourite ever film Alien3-worst sequal/film of all time. Unique amongst lousy sequals in that not only is it a terrible film in itself but it ruins your enjoyment of the first 2 films Alien 4-ok, not brilliant but it gives Ripley her happy ending, love the Cal relationship and Kim Flowers (the other female space pirate) has the most exquisite backside in the history of cinema. Written by Joss Whedon and you can see the beginnings of Firefly here Alien vs Predator-ok, very dumb fun movie, Lance Henriksen raises it up to a level it doesn't really deserve Alien vs Predator; Requiem-shows how far the series has really fallen since the first 2 amazing installments. Everyone always talks about the infamous maternity ward scene but I can never take it seriously (reputedly the actresses were told to act as though they were having a 'fatal orgasm' as though the characters were at some level actually enjoying the experience). Always find the scene where the Pizza boy gets beaten up more shocking because it's real. So should we have another? Sigourney still looks great to judge by Avatar although they'd have to throw a great deal of money her way. Personally I'd say yes but only if they go back to the derelict with the spacejockey and solve the original mystery surrounding the ship. Otherwise no, just leave things be.