Basically, without 'Flash Gordon', there would be no 'Star Wars'.  Besides Flash being a prototype for Luke Skywalker, many things from the Flash Gordon serials were stolen.  These include scrolling text, symphonic music, electricity shooting out, spaceships, cities on alien worlds, even some snow scenes that are reminiscent of Hoth. 
     Someday, I will watch the whole Flash Gordon series again, and take snapshots of anything that was stolen for Star Wars.

     I could never watch Buck Rogers, because they used the same belt that Buster Crabbe wore in Flash Gordon.  That made no sense whatsoever, and ruined the illusion.  Plus, that series just wasn't as good.