'Supernatural' Season 10 Spoilers: Sam And Dean Winchester Back In The Men Of Letters Bunker In Episode 8 Promo Video Clip

Dean Winchester (Jensen Ackles) got cured from being a demon in "Supernatural" Season 10, episode 3 titled "Soul Survivor" but the hunter still deals with the effect of the Mark of Cain. The latest promo video clip for the upcoming episode teased that the Winchester brothers are back in the "Men of Letters" bunker conducting research on the powerful symbol.

Aside from helping Sheriff Jody Mills (Kim Rhodes) and Sheriff Donna Hanscum (Briana Buckmaster) in "Supernatural" Season 10, episode 8 titled "Hibbing 911," Sam (Jared Padalecki) and Dean Winchester will also have their attention of the troublesome Mark of Cain that the older Winchester brother got in "Supernatural" Season 9, episode 11 titled "First Born."

The promo video clip begins with Sam asking Dean, who was reading books in the bunker, if everything is good. "Aces, I love the smell of parchment in the morning," Dean responded.

"You have nothing on the Mark?" Sam asked. Dean explained that the "Men of Letters" bunker appears to have every answer to supernatural cases but when it comes to the Mark of Cain, they do not have any.

"Here, He-Wolf She-Wolf: A Study on Werewolf Transgenderism - 600 pages, volume 1. But on something important, maybe the oldest symbol known to man, that's not worth their time," Dean shared to his brother sounding really annoyed. Click HERE to watch the video clip shared on the "Supernatural" Facebook page.

Meanwhile, the synopsis for "Supernatural" Season 10, episode 8 in a Hypable report confirms the return of characters Sheriff Jody Mills and Sheriff Donna Hanscum. The two will meet at a mandatory sheriff's retreat where they will stumble upon the case of a body with just strings of meat and skin hanging off the bones.

The local sheriffs think what happened is an animal attack but Sheriff Mills knows better so she contacts the Winchester hunters to help on the case. Click HERE to see the promotional photo stills featuring Sam, Dean, Jody and Donna.

"Supernatural" Season 10, episode 8 titled "Hibbing 911" is scheduled to air on Tuesday night, Dec. 2, at 9 p.m. ET on the CW Network.

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