Full Episode: http://goo.gl/KXFud9 Part 3: http://goo.gl/xE6KNr Part 4: http://goo.gl/0Qv29w Part 5: http://goo.gl/f2iQtS On a Saturday morning in May, police say two 12-year-old girls convinced their friend to follow them into the woods for a game of hide-and-seek. It was the rouse they concocted, according to police, to carry out their plan to murder her, something they had been plotting for months. According to investigators, the two eighth graders, Morgan Geyser and Anissa Weier from Waukesha, Wisconsin, had decided they wanted to be with Slender Man, a fictional horror character born from a dark corner of the Internet. In stories they read about him online, Slender Man kidnaps and kills children. Not only did the girls believe he was real, police said, they were convinced the only way to get in his good graces was to kill someone too. But Slender Man isn’t real. And their friend, a 12-year-old girl named Payton Leutner, survived being stabbed with a large kitchen knife 19 times. The Slender Man stabbing case would go on to not only rock the Waukesha community, but shock people across the United States and internationally. It would also put a spotlight on Slender Man’s massive cult-like following. In an ABC News “20/20” exclusive, Payton and her parents, Stacie and Joe Leutner, opened up for the first time about recovering from the horrific ordeal.