"Supernatural" season 12 is off to a great start. What happens in season 12, episode 6, titled "Celebrating The Life Of Asa Fox"? It turns out that Mary Winchester will return. Also, Sam and Dean will have to deal with a demon determined to kill all the hunters one by one.

Synopsis for season 12, episode 6

The synopsis for the next episode of "Supernatural" reveals that hunters will gather to mourn the loss of one of their own. However, that is not the only thing that will be dealt with in this episode.

It turns out that there is a demon who uses this opportunity to kill the hunters off one at a time in a very creepy way.

Mary Winchester returns

Last week, Mary Winchester (Samantha Smith) was not seen. That will change next week when she appears in "Celebrating The Life Of Asa Fox." She will try to help Sam (Jared Padalecki) and Dean (Jensen Ackles) deal with the hunter-killing demon.

'Pretty Little Liars' actress appears in 'Supernatural'

Kara Royster appeared in season 7 of "Pretty Little Liars" as Yvonne, Toby Cavanaugh's (Keegan Allen) new girlfriend.

It was reported a few months ago that she would appear in season 12, episode 6 of "Supernatural." She will play the role of Alicia, who was raised by a witch. She and her brother, Max, are now hunters who encounter Sam and Dean.

Will Mary, Sam, and Dean Winchester survive?

The promo clip shows Sam and Dean Winchester inside of a house with other hunters. They are locked inside, the lights flicker, and there is a supernatural force inside with them.

One body is seen on the ground and Dean is thrown through a set of glass-paned doors. Obviously, the Winchester brothers survive or else there would not be any more episodes.

Billie returns as the Reaper

Get ready to see Billie (Lisa Berry) return in "Supernatural" season 12. As fans recall, she is one of the reapers. She will appear in episode 6 with Dean and Sam Winchester and can be heard saying that "everyone dies."

What do you think is going to happen in the next episode of "Supernatural"?

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