Slender Man was a creepypasta trend in 2009 but had some serious sway with both Morgan Geyser and Anissa Weier, who then plotted the murder of their best friend Payton Leutner because Slender Man told them to. This is both our first real True Crime dive and also the heaviest episode we've done so far. Strap on in because it's about to get dark as heck.