Oh boy. I kind of get how this film acquired its cult status. It is indeed a spectacle, certainly if you are the type of ironic film fan who gets a kick out of horrible, tasteless cinema. In that sense, Flash Gordon is one of the more interesting films out there. In any other sense, it's a complete disaster.
Ming is an intergalactic ruler who has it out for planet Earth. From Mongo, a faraway planet, he plans his attack to get rid of all the people on Earth. A football player (Flash) and his girlfriend are hellbent on stopping him, and they travel through space to make sure Ming won't be able to execute his plans.
Everything is either incredibly cheap or incredibly kitsch. The costumes are horrendous, the score is maddening, the performances are soul-crushing and the film just keeps on going and going. Everything is just terrible and misguided, which I guess makes it funny to some. Not my kind of cinema. At least it's not boring.