Dean looks extremely uncomfortable receiving a hug from Cas in "King of the Damned."

Sam gets a hug of appreciation from Cas in "King of the Damned."

Sam and Dean listen to Cas. He has asked for their help interrogating a captured angel in "King of the Damned."

Jared Padalecki as Sam Winchster in "King of the Damned."

Jensen Ackles as Dean Winchester in "King of the Damned."

Castiel asks Sam and Dean for help interrogating a captured angel in "King of the Damned."

Abaddon has a bargaining chip she uses to convince Crowley in aiding her to help killing Sam and Dean. Is this it?

David, Freddie Costa (Stephen Martines) and Margo Lassister (Danielle Savre) hang in the hallway in this photo from the backdoor pilot for Supernatural "Bloodlines."

David and Violet walk through the woods in this photo from the backdoor pilot for Supernatural "Bloodlines."

Julian Duval (Sean Faris) and Violet Duval (Melissa Roxburgh) in a photo from the backdoor pilot for Supernatural "Bloodlines."

This photo sums up the original series as Sam and Dean lean on their Impala in this photo from the backdoor pilot for Supernatural "Bloodlines."

Dean leans on the Impala in this photo from the backdoor pilot for Supernatural "Bloodlines."