'Supernatural' EPs Spill on Castiel's S9 Role

Misha Collins was promoted to series regular for Supernatural's currently-airing ninth season and a brand-new behind-the-scenes featurette reveals exactly why it was so important to have him around full-time to bring Castiel's new journey to the screen.

VIDEO - Misha Collins Reveals His Major Castiel Mistake

"In being human for the first time, he's really going into this without a net," Supernatural executive producer Jeremy Carver says in ETonline's exclusive sneak peek at at a behind-the-scenes clip in support of the Supernatural Season Pass, now available on iTunes. "He's not going to be with The Winchesters, so he's not going to have his safety blanket to lead him through this."

"His arc this year is really interesting," EP Robert Singer adds. "Starting out with what it really means to be human, having to eat, having to sleep." He's also dealing with the fallout from all the angels falling to earth, which you could blame him for -- and as you've seen this season, many are!

To watch the rest of this behind-the-scenes look at Season 9, get the Supernatural season pass today on iTunes!