I voted for 2001: A Space Odyssey because I was a child then and remember how it sparked the minds of my classmates who were allowed to see it. My family was poor so I didn't go to theaters to see movies then. I am sure Metropolis was a fine motivator of its time since I think it was the original sci fi movie, but it was too far before my time to know for sure. The Last Star Fighter was a fun movie and I own a copy for my personal library, but I would not say it was all that influencial.