Supernatural Season 12 episode 7 is set to return on December 1 after a short holiday break. Fans are speculating about what to expect.

In the last episode, viewers get to witness a glimpse of Mary's fate. She was presented with the offer to return heaven by reaper Billie but she hesitated.

Fans are speculating that Mary will ultimately take this offer and it will be the end of Samantha Smith's character in the TV series.

Meanwhile, Lucifer will be back and this time his vessel is a rock star rock star named Vince Vicente. Lucifer knows that he needs a spotlight and a crowd to further progress with his plans. Knowing what Lucifer is up to, Dean, Sam and Castiel will have to give their best to stop the Devil.

Cater Matt gives the synopsis of the episode as, "Lucifer realizes that as rock star Vince Vicente, he can get his fans to do whatever he wants. Thrilled with this power, Lucifer arranges to play a secret VIP concert in order to kill all of them. Sam, Dean and Castiel enter the underbelly of the music industry to try to stop him." 

Lucifer has a big plan to commit a mass murder during the concert, reports BreatheCast.

Mary's journey back to being alive didn't go down as both Dean and fans expected. With her continuous struggle on Earth, rumors of her leaving for heaven again are flying around already.

 It is to be noted that Mary never asked to get sent on Earth, it was Dean's idea to use the gift that Darkness gave and bring Mary into their lives again.

Another speculation that fans are having is that it was actually Dean himself who might have asked the reaper to take Mary, in order to save Sam, Jody and the rest of the hunters.