It’s perhaps slightly difficult to review, “The Babysitter: Killer Club,” if your trajectory towards the film is like this reviewer’s: being told, and reading through reviews, that the original, “The Babysitter,” was a surprise Halloween treat from Netflix in 2017, retroactively viewing it and discovering that’s not at all the case. Directed by McG, the Costco brand of Michael Bays, “The Babysitter”—which was about a boy in love with his babysitter only to discover she’s part of a Satanic cult— isn’t very good, and ultimately rather juvenile and crude. But fine, for the sake of the argument, one can see how the combination of the charming and appealing Samara Weaving (“SMILF”) and the wild horror genre twist and irreverent teen comedy riff on “Adventures in Babysitting” could be entertaining for some audiences. Brian Duffield is a crafty writer, and it’s possible it read clever on the page, and on the screen, in this director’s hands, it became, well, rather sophomoric.