According to Daley, he and Jonathan Goldstein presented “about eight different ideas for worlds to set the episode in” after being offered to write an episode of “Bones.” Fortunately for them, the show hasn’t done a myth-busting episode, and it just so happened that Goldstein and Daley already had an idea featuring mythological creatures that they tried to turn into an animated movie
“We didn’t really pursue it for a long time and found out after the fact that [someone] was doing exactly that, an animated movie with [the Loch Ness Monster, the Yeti, and others] — we missed it,” Daley said. “So we still thought that the world of mythological creatures is fun and hasn’t really been tapped into a lot. And I figured out a way to incorporate it into a crime-solving show.”
“Bones” is not the first detective show to dabble in potentially supernatural stories. The TV show “Castle” occasionally had cases that verged on supernatural, as does “True Detective.” Still, it was rare among its competitors, but that is just one more thing that separated “Bones” from other procedurals.