By "genre" I mean not just science fiction, but also fantasy (and fantastic) movies, supernatural horror, superhero, "weird," etc. I'm trying to figure out how and why the interest in ambitious genre movies seems to wax and wane along twenty-year cycles โ€” the '50s were a big boom time, but the '60s were relatively quiet until Planet of the Apes and 2001 came out at the end, and then there was a really big boom that started with Star Wars in 1977, and lasted until the early to mid-'80s before fizzling out again, before firing up again in the late '90s and early '00s with The Matrix, the prequel trilogy, Harry Potter, and LotR. Obviously this isn't a perfect theory, but my take is that for a variety of reasons (and placing nostalgia aside) the '90s were actually pretty bad for genre movies, in spite of advances in technology and a generation of fans who seemed to be disposed to liking SF and fantasy.