Streaming on Oct. 12, Netflix’s series “The Movies That Made Us” sheds light on some of the darkest modern horror classics: “A Nightmare on Elm Street,” “Halloween,” and “Friday the 13th” — three scrappy productions that went on to see massive, enduring success.

The show’s creator and director, Brian Volk-Weiss, took The Post behind the scenes of those films, revealing little-known facts about what it was like making scary movies before the genre had any juice, the origins of some of the creepiest characters — and actual horrors experienced on set.