‘Supernatural’ Season 12 Spoilers: Castiel Gets a Lead On Lucifer’s Baby In Episode 15 ‘Somewhere Between Heaven And Hell’ [VIDEO]

Last week’s tepid “Supernatural” episode ended with the death of alpha vampire. Sam (Jared Padalecki) is now on board with his mother Mary (Samantha Smith) about working with the British Men of Letters (BMOL). The covert organization wants to eliminate all supernatural creatures in America on The CW series.

However, Dean (Jensen Ackles), Sam’s stubborn elder brother, was still wary of working with the demon-fighting organization.

Elsewhere, “Supernatural” revealed that Crowley (Mark A. Sheppard) is holding Lucifer (Mark Pellegrino) hostage in hell.

What will happen this week?

According to the synopsis on TVGuide, Season 12, episode 15 will see Dean and Sam Winchester investigate a case that involves an invisible hellhound. This demonic creature has attacked a campsite. The promo of the episode, titled “Somewhere Between Heaven and Hell,” shows Crowley informing the hunters, “This isn’t just a hellhound, this is the hellhound.”

The king of hell teams up with the boys in order to solve this case. However, trouble brews for Rowena’s (Ruth Connell) son when two of his personal demons discover that he is hiding Lucifer. The devil has been a favorite of demons and evil creatures. Will they unshackle him?

Meanwhile, Castiel (Misha Collins) will be busy searching for Kelly Kline (Courtney Ford), the woman carrying the devil’s baby. When we last saw Kelly, she was being protected by Dagon, the Prince of Hell. She accepted his protection after an angel tried to kill her. Lucifer knows that Dagon is watching over his offspring.

We will have to wait and see if Dean joins the BMOL in “Supernatural” Season 12. With Sam now a part of the organization, it is only a matter of time before he can convince his brother to join them.

Catch new episodes of “Supernatural” on Thursdays at 8 p.m. EST on The CW.