Dean Winchester is not letting his brother go down without a fight.

In a new, extended promo for Supernatural Season 9, we see the latter enlist the assistant of fallen angel Ezekiel (Tahmoh Penikett) to go inside his head (for some reason) in order to help Sam recover from the injuries he suffered after failing to complete the third trial at the end of Supernatural Season 8.

Elsewhere in the promo, we see Castiel being hunted by very pissed off angels - including Grace Phipps - and we also see a sight for sore Supernatural eyes: Yes, that's Bobby!

Watch the trailer now and let the countdown to the October 8 premiere begin!

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.