Buck Rogers in the 25th Century (1979)

Buck Rogers in the 25th Century is a 1979 American science fiction film directed by Daniel Haller. Starring Gil Gerard in the title role, it was produced by Glen A. Larson who co-wrote the screenplay with Leslie Stevens, based on the character Buck Rogers which was created by Philip Francis Nowlan in 1928.

Originally made as a television movie pilot, Universal Studios opted to release the film theatrically several months before the subsequent television series aired.
https://en.wikipedia.org/wiki/Buck_Rogers_in_the_25th_Century_(film)

Disco 70s go full bore on this one. Star Wars has nothing on Buck Rogers in the 25h Century!