It seems that Charlie has returned, and she's helping Sam and Dean with some research on a really ancient-looking book.

So what secrets are inside its pages? Might it have the key to getting rid of the Mark of Cain?

But that's not all these preview pictures for Supernatural Season 10 Episode 18 reveal. It seems as if Sam is meeting up with Rowena, and Castiel and Metatron are enjoying some quality time over breakfast.

So help yourself to these fun photos from "Book of the Damned," and then return for my recap and review after the episode airs on Wednesday at 9/8c.

Supernatural Photos From "Book of the Damned"

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Sean McKenna was a TV Fanatic Staff Writer. He retired in May of 2017. Follow him on Twitter.