The first season of “Stranger Things” was a true surprise. Netflix’s surplus of content makes it easy for a show to sneak up out of nowhere, and while most are middling, some, like this Spielbergian, ‘80s throwback are home runs. A gleeful homage to nearly every sci-fi adventure from that nostalgic decade, “Stranger Things” also managed to carve out its own space, offering up nuanced and well-rounded characters of all stripes and a genuinely startling narrative (not to mention the elder Jean-Ralphio meme that should never die). Certainly, a number of webs were left tangled at the close of season one (Eleven!), but, at this point, it’s hard to imagine that season two can muster the same novel creativity and compact narrative structure. Still, whatever the case may be, odds are “Stranger Things” season two is going to be some of the better hours of TV this fall.