Time travel. Now that's a reasonable plan?

Reasonable, it may not be. But it is THE plan this Friday on Supernatural as Dean and Sam travel back to the Old West in an all-new episode, "Frontierland."

What takes place once they get there, and more importantly, who shoots first? Check out the CW's promo and a sneak peek from Supernatural below to see:

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.