A documentary about the mythos and real-world effects of the internet legend, Slender Man, consisting of clips from various sources from across the internet.
| Actor | Role |
|---|---|
 Sophie GraceSelf (archive footage) | Self (archive footage) |
 Morgan GeyserSelf (archive footage) | Self (archive footage) |
 Anissa WeierSelf (archive footage) | Self (archive footage) |
 Skylar Morgan JonesSelf (archive footage) | Self (archive footage) |
 Chris HansenSelf (archive footage) | Self (archive footage) |
 Grace RandolphSelf (archive footage) | Self (archive footage) |
| JJenny NicholsonSelf (archive footage) | Self (archive footage) |
 Felix KjellbergPewDiePie (archive footage) | PewDiePie (archive footage) |
 Matthew SantoroSelf (archive footage) | Self (archive footage) |
 Drew PinskySelf (archive footage) | Self (archive footage) |
 Perri NemiroffSelf (archive footage) | Self (archive footage) |