What you have before you is an ever growing list, curated by the Horror Duo of the Slaughter Film Podcast, compiling every horror and sci-fi documentary available. Some are recently crowd funded while others have nearly been lost to VHS.
While most focus on the horror and sci-fi genres in general, some zero in on a particular filmmaker or period of time when censorship got the better of those genres.
We may have overlooked certain "making of" featurettes produced and found only as supplemental material for the DVD/BLU release of those films. If you know of any OTHERS that are missing, please contact the Slaughter Film Podcast on social media, or send us an e-mail. Thanks!