Marble Hornets is a YouTube web series inspired by the Slender Man online mythos. The first video was posted on YouTube on June 20, 2009, following a post that its creator, Troy Wagner, created on the Something Awful forum the previous day. It was one of the first webseries to be created around the character, with the first episode premiering exactly 10 days since the appearance of the original images of Slender Man on the Something Awful forums.
