HBO's documentary Beware the Slenderman - which investigates the near-fatal stabbing of a girl by two others - will be airing on HBO in January 2017.
The crime documentary examines the brutal attack a girl in Waukesha, Wisconsin suffered at the hands of 'two friends' who were also girls, where she was repeatedly stabbed twelve times.
The attackers claimed the Slenderman made them do it. The Slenderman was in fact created recently as an Internet meme in 2009 from the Something Awful community and has featured in video games and other pop culture.
"Beware the Slenderman discusses the incident in which two girls attempted to murder one of their friends in an attempt to appease Slender Man, a fictional monster who originated from an internet "creepypasta". The documentary was shot over eighteen months and contains interviews with the families of the two would-be murderers."
Beware the Slenderman premiers on HBO January 23rd, 2017.