The 70s were a decade of the gritty anti-hero in movies. Some film historians credit the success of Star Wars to audiences responding to the movie's "good guy" heroes and high adventure. 1977's blockbuster success influenced more than just movies - sci fi trappings beamed up in a big way everywhere you looked.
Sadly, it wasn't all good. Here's a clip from ITV's Kenny Everett Video Show - British comedy skits and pop music, if you don't remember. This wasn't shown an awful lot in the states, but as a pre-teen I was fascinated by the show's early video effects, music I'd never heard before, and the (quite controversial and underdressed) Hot Gossip dancers. Here they are with their own simply awful sci-fi musical tribute. See how many SF theme songs snippets you can spot in this 1978 video clip.