My top 20 favourite science fiction films of all-time.

Because sci-fi is my favourite movie genre, and because I like to procrastinate on studying, I have compiled this list. There are many sci-fi’s that I have not seen (Close Encounters of the Third Kind, Brazil, Metropolis, E.T., Dark City,) just to name a few, which I plan on getting around to over the summer. Any other recommendations you may have are much appreciated.