HBO's 'Beware the Slender Man' explores the internet's 'dark basement'
Truth is stranger than fiction.
Teen in 'Slender Man' case pleads not guilty due to mental illness
Morgan Geyser and Anissa Weier are accused of stabbing a 12-year-old girl while attempting to summon 'Slender Man'
5 things you probably didn't know about the Slender Man stabbing
A new documentary uses the Slender Man stabbing to investigate how the Internet can affect children.