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Urban Myth Doc ‘Beware the Slenderman’ Debuts on HBO

Beware the Slenderman, a documentary about an urban myth that nearly claimed a young life, debuts on HBO Monday (Jan. 23) at 10 pm. ET/PT.

Irene Taylor Brodsky directed the film, about two Wisconsin 12-year-old girls who stabbed a friend and left her for dead out of deference for the fictional Slenderman, an Internet creation.

Beware the Slenderman features interviews with experts who help put the girls’ mental state and the Slenderman myth in context, revealing “how adolescent isolation, mental health issues and the nebulous reality of the Internet created a chilling mandate for two young girls, with life-altering consequences,” HBO said.