Marble Hornets

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Marble Hornets is an American found footage web series created by Troy Wagner, Joseph DeLage, and Tim Sutton. It is a pseudo-documentary based on the Slender Man online mythos. The first video posted to YouTube was on June 20, 2009, 10 days after Eric Knudsen made the original images of Slender Man on the Something Awful forums. It follows film student Jay Merrick (Wagner) as he investigates what happened to the student film Marble Hornets, abandoned by its director Alex Kralie (DeLage) after encountering the Slender Man (called "the Operator"). There are 92 episodes on the Marble Hornets channel, with accompanying videos from a diegetic side-channel, totheark. As of late 2025, it had over 700,000 subscribers and received 125 million views. It also established the Slender Man symbol (also called the Operator Symbol or Proxy Symbol), which has since appeared in many other stories featuring the character. It would go on to inspire multiple web series in the same style as Marble Hornets, including...

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