User blog comment:BalrogLune/Aliens in Supernatural/@comment-208.76.203.228-20150101214358

But the existence of extraterrestrial life has been hinted out in the show. Death himself has always made references to how young life on our planet was. Metatron made a reference to alien life when he was bargaining with Hannah in the dungeons of Heaven. And because evolution is a confirmed thing in the supernatural universe, I don't see how extraterrestrials are such an outrageous proposition in a universe where ultraterrestrials (faries and beings from different dimensional planes. [Demons could be considered one because Hell is a different dimension as our universe]) and pan-dimensional beings (angels and inhabitants of Heaven) exist. Supernatural is unique because it's a fantasy show with sci-fi elements. It's a genre of it's own, therefore it's not confined to any conventions. The only thing this can be compared to is The Twilight Zone.