Flash Gordon
Starring Buster Crabbe, Jean Rogers, Frank Shannon, Charles Middleton, Priscilla Lawson, Richard Alexander, Jack 'Tiny' Lipson, James Pierce, Theodore Lorch, Earl Askam
It's a action & adventure and science-fiction movie, and has a rating of 7 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Austria.