Hmmm, I like lots of films, and I really like good sci fi films. Trouble is, most sci fi films are rubbish!
I think my favourite film is probably Aliens, with Sigourney Weaver. I saw it when I was younger and it’s stayed my favourite film for ages. There have been loads of films I’ve enjoyed recently, but from a sciencey angle, I really enjoyed Sunshine, Danny Boyle’s film about the Sun stopping.