Is Lucifer’s (Mark Pellegrino) baby evil or good? It’s a question every “Supernatural” fans are asking now with only a few weeks left for the CW series to air its Season 12 finale. Last week, Dean (Jensen Ackles) and Sam Winchester (Jared Padalecki) teamed up with Castiel (Misha Collins) to find Kelly (Courtney Ford) and kill her and the devils’ child that she is carrying.

Unfortunately, things went horribly awry in Season 12, episode 19. Not only did neither Kelly nor her baby die, but Castiel decided to protect the baby until its born. Apparently, Satan’s spawn lent his powers to the angel so that he could take down the Prince of Hell Dagon (Ali Ahn), heal an injured Dean and see the future.

Using his newfound powers, Cas knocked the Winchester brothers and rode off with Kelly and her baby. Sadly, even the Colt was destroyed in the ensuing scuttle.

What will happen this week on “Supernatural”?

READ: When will the “Supernatural” Season 12 finale premiere?

According to the synopsis of Season 12, episode 20 on TVGuide, Alicia Banes (Kara Royster) calls Mary (Samantha Smith) for help after her mother, Tasha (Alvina August), goes missing. Mary needs help and she calls Sam. After answering her son’s call, Sam and Dean head out to help Alicia and her twin brother Max (Kendrick Sampson). Their mother was hunting a powerful witch.

However, Mary does not join the hunt. While her boys help Alicia and Max, she gets detained by none other than Mr. Ketch (David Haydn-Jones), the notorious serial killer working for the British Men of Letters (BMOL).

The promo of the episode, which is titled “Twigs & Twine & Tasha Banes,” provides more spoilers. In the video, Ketch and Mary are seen fighting. Mary throws him a nice punch but he eventually gets her handcuffed to a chair. The clip ends with Ketch readying some tools to use it to torture her. It’s hard to believe that these two had an affair!

Needless to say, Mary now has some serious doubts about working with the BMOL.

“Supernatural” executive producer Andrew Dabb had warned fans that Ketch isn’t someone to have feelings for a woman easily. “With Mr. Ketch, there’s a really strong dividing line between personal and professional,” Dabb explained to TVLine. “He’s been conditioned his entire life to follow orders. So for him to take a stand against following an order like that, it would be really a drastic change to his character.” Poor Mary.

Dabb also provided some major spoilers about the Season 12 finale to Entertainment Weekly. “Lucifer is going to play a lot in our final run. The first part of the season was devoted to getting to know mom a little bit and the first part of the Lucifer story, the second part of the season strongly has been about the British Men of Letters and how they relate to Sam and Dean, and in the back third of our season, we’re really bringing all that stuff together. After doing a lot of ground work and lining up our dominos, we’re going to start knocking some stuff down. Lucifer will be a big part of that, Ketch and the British Men of Letters will be a big part of that, and I think it hopefully will build up to a really, really exciting finale.”

“Supernatural” airs Thursdays at 8 p.m. EDT on The CW.