Demon! Dean Winchester

Dean, bearer of the cursed Mark of Cain, which terrified even Crowley, fell to the hand of death. But the Mark wouldn't let him go, bringing him back to life as a demon. Months of searching by Castiel and Sam finally paid off. They captured Dean, and Sam desperately tried to rid his older brother of the demonic taint while Castiel was away. But it all went to ruin. Dean, teetering on the edge between man and demon, managed to break free from the devilish trap, and the demonic essence within him felt no remorse whatsoever when he tried to kill Sam.

Several days later, Sam and Castiel returned to the bunker. A siren blared, red lights pulsed, illuminating the chaos: overturned furniture, scattered belongings... Clearly, the entire scene screamed that something had happened.