On this episode of Supernatural…

Sam and Dean investigate a case involving a hellhound.

Turns out, a couple of demons let one loose so they could find out what Crowley had been hiding.

The hellhound was struck by a girl named Gwen, and it decided it wanted revenge.

Sam and Dean get Crowley to help them track down the hellhound, and Sam kills it.

The demons free Lucifer, but he kills them.

Lucifer discovers that his vessel is the prison and that Crowley is still in control.

Sam reveals he’s been working with the British Men of Letters.

Castiel gets an offer to return to Heaven if he helps hunt down Lucifer’s child.