A nice little Gerry Anderson (Thunderbirds, Space 1999, etc.) flick is Doppelgänger (Journey to the Far Side of the Sun).
No one has mentioned Star Wars (1977) (later renamed Star Wars: Episode IV: A New Hope) probably because it seems too obvious. It changed SF, cinema and the media landscape forever.
So many good films mentioned here.
A nice little Gerry Anderson (Thunderbirds, Space 1999, etc.) flick is Doppelgänger (Journey to the Far Side of the Sun).
No one has mentioned Star Wars (1977) (later renamed Star Wars: Episode IV: A New Hope) probably because it seems too obvious. It changed SF, cinema and the media landscape forever.