Beware the Slenderman is a HBO feature length documentary which visits the strange incident where two 12 year old girls attempted to murder one of their friends. It was an effort on their part to appease Slender Man, a fictional monster who originated from an internet phenomenon known as “creepypasta”. These creepypastas are horror-related legends or images that have been copied and pasted around the Internet.
Shot over the course of eighteen months the film contains many interviews with the families of the two would be murderers in an effort to gain some understanding as to how something like this could happen. We also see many YouTube videos related to Slender Man and learn of this characters popularity.