Name a great sci fi movie!

Name a great sci fi movie and why it's great. I'll start with one: 

Interstellar. Space Opera on the big screen!

The Prototype Official Teaser Trailer #1 (2013) - Andrew Will Sci-Fi MovieMovieclips Trailers I like this movie because it has a hero you feel sorry for.. It has cool nerd special effects and the droid is steampunkish old school looking.It has bad ass techy fighting scenes Something like this will probably happen soon one day. This movie was completed 3 years ago. But has been delayed several times and is supposed to be released in spring 2017