'Ben Edlund came up with the concept of that [the giant Leviathan mouths], and I was so excited when I first saw it in the editing room,' [producer Daniel Loflin] recalls.
'Ben Edlund is a crazy, mad-scientist genius,' explains visual effects supervisor Ivan Hayden. 'I remember thinking, "Giant mouth. How can I make that scary?' I always try to draw from physics and evolution, so for this mouth to open up, it really had to be hinged, because if we had this big mouth open up out of nothing on a person's head it would look fake. Human jaws hinge right behind the ear, and when a Leviathan opens its mouth it still hinges right behind the ear, so it makes sense in the real world. Then we added the long teeth. The tongue was actually something that we originally had as an intelligent thing that would reach out and grab for people and stuff like that. That went a little bit too far in the end, but originally we all loved it. So the tongue went from being this crazy mandible thing to just this split tongue, which is still pretty crazy.'
Supernatural: The Official Companion Season 7, by Nicholas Knight. Titan Books, 2012. (pg. 29)
