'20/20' Exclusive: 'Slender Man' Attack Survivor's Story

Meet the young survivor who was brutally stabbed and hear from her parents for the first time about the horrific ordeal, Friday at 10 p.m. ET.
1:35 | 09/22/14

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Transcript for '20/20' Exclusive: 'Slender Man' Attack Survivor's Story
Friday David Muir reporting a survival story so unbelievable and so shockingly real. A twelve year old and what started out as a -- she's gonna go roller skating it's been an editor best friend's house can't. Took a horrifying turn you think she had any idea. What she was walking into -- now. -- -- -- -- TV -- with one Finley and their harrowing story why would 212 year old girls try to -- brutally stabbed their friends. Nineteen times he told police wanted to kill the victims so people would eldest -- -- real. Over a mysterious fictional figure on the Internet how do you even -- their heads about it's just too. For the first time anywhere firsthand moment by moment chilling details from the family from -- left alone to die in the with the security there -- multiple -- -- how she miraculously fought off -- where on earth do you think she -- the strength to crawl out of us what's she. So I wanted to live -- -- -- hugged her and -- -- -- going to be OK it's going to be but I could see that she was covered in stab wounds. It -- it takes is one -- mind. David -- and for the first time. Meet at twelve. She's an amazing time. She's definitely are -- and prepare. One -- message to parents around. -- the stunning 21 twins' season premieres Friday at 10:9 central on ABC.

This transcript has been automatically generated and may not be 100% accurate.

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