2 April 1968 to 25 May 1977
What is your favourite sf film released between 2 April 1968 (the premiere of 2001: A Space Odyssey (1968)) and 25 May 1977 ( the general release of Star Wars (1977))?
One only please (imagine the world is about to end and you can only save one sf film!)
I'll go with Sleeper (1973).
"It is a good thing for an uneducated man to read books of quotations" Winston Churchill (1874-1965)