For Supernatural fans, the Mark of Cain has never been worse (or better, depending on how you look at it) than the moment it turned Dean into a demon in the season-nine finale. But despite Dean making it back to his normal, human self, the Mark is still around, and fans haven’t seen the last of its supernatural effects.
When we left the Winchester brothers in 2014, Dean had just murdered an entire house full of normal humans. Sure, they were despicable humans, but as fans of the show know, the Winchesters hunt “things,” not people. But thanks to the Mark of Cain, Dean’s rage has grown past the point of differentiating between what is right and wrong. So will human Dean end up being darker than Demon Dean ever was?
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