'Slenderman,' Mythical Creature Associated With Wisconsin Stabbing, Explained

A 12-year-old girl in Wisconsin was lured by two friends to the woods this past weekend, where she was then stabbed by them 19 times in an attempt to meet the mythical creature "Slenderman."

The victim survived and the two stabbers have been arrested, but the event raised the question of who and what is "Slenderman." Watch the clip above to find out.