Do you know any "great" sci-fi/fantasy movies that you'd recommend? I mean movies like Star Wars and The Lord of the Rings.
The Day the Earth Stood Still (Remake,2008) will come up in early december. I've seen the trailer and it looks good.
Although it's better if you're familiar with Firefly, Joss Whedon's Serenity is pretty much amazing. For something older, you should try out Dune.
The Blade Runner, THX 1138 and kin-dza-dza are some classics of sci-fi you should watch if you´re into the genre.