10. BUCK ROGERS IN THE 25TH CENTURY (1979) was released theatrically in March 1979. This is still the best live-action version of Buck Rogers. I think this film [a.k.a. pilot movie episode "Awakening"] was superior to what changes ultimately happened during the production of season one and two. For this reason, I consider it a stand-alone film as was the 1980 Flash Gordon live-action film.
7. LOGAN'S RUN (1976) The premise of this dystopian utopia is fascinating.
The runner-ups are: ESCAPE FROM THE PLANET OF THE APES(1971), SOYLENT GREEN(1973), OMEGA MAN(1971), DAMNATION ALLEY(1977), LAST DINOSAUR(1977) and MOONRAKER(1979)[which showed us in '79 what the N.A.S.A. Space Shuttle Orbiter fleet would be like in '81].