"QUINT: Because on the panel it seemed like they were hinting at the creatures having a more biological origin than spilling out of a portal from hell...

KARL URBAN: Yeah... I think that's probably more the case. Hell is there in a multitude of forms. Maybe not as literal as some people would like, but is basically represented in a kind of multi-faceted way. There's references to where these creatures come from... I mean, my character makes a reference in the film about the origin of the creatures. You know, it's really up to... well, it's down to your personal belief system and what you believe hell is. There are so many different interpretations of that concept.
I think I can safely say that I believe we are faithful to a multitude of concepts of Hell."