More from the article...

... In honor of its 50th anniversary, Disney/20th Century Studios is releasing a newly restored 4K HDR version in October, along with deluxe special editions on DVD and Blu-ray. And the film has inspired not one, but two documentaries marking its five decades of existence: Strange Journey: The Story of Rocky Horror and Sane Inside Insanity: The Phenomenon of Rocky Horror.

(Spoilers below, because it's been 50 years.)

The film is an adaptation of Richard O'Brien's 1973 musical for the stage, The Rocky Horror Show. At the time, he was a struggling actor and wrote the musical as an homage to the science fiction and B horror movies he'd loved since a child. In fact, the opening song ("Science Fiction/Double Feature") makes explicit reference to many of those, including 1951's The Day the Earth Stood Still, Flash Gordon (1936), King Kong (1933), The Invisible Man (1933), Forbidden Planet (1956), and The Day of the Triffids (1962), among others. ...