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We’ve been covering the modern monster mythos of ‘Slenderman’ here on the Grail since back in 2011, when Cat Vincent contributed an article about ‘Slendy’ to Darklore Volume 6. From small memes, however, big things grow – and in May this year it was announced that Slenderman would get his own movie.

And now, to add to that, HBO will be airing the documentary Beware the Slenderman in January. Here’s the trailer, which focuses on the (real-life) attempted murder (by stabbing) in 2014 of a 12-year-old girl by two friends who claimed to be doing it on behalf of Slenderman:

For more background reading on the Slenderman phenomenon, be sure to check out Cat Vincent’s articles “The Slenderman” (PDF), “Killing Slenderman“, and “Slenderman: Five Years“.