4x04 Metamorphosis

After watching Sam harness his powers, Dean angrily confronts him. Dean and Ruby also have a confrontation. Distance and tension is put between the two brothers as Dean realizes his younger brother is manifesting the demonic blood inside him with Ruby's help, and lying to him about it. Sam argues that he is able to save people and exorcise demons at the same time, but Dean reveals to Sam that Castiel has ordered him to stop Sam or else Castiel will, indicating he will kill Sam otherwise. Meanwhile, a hunter asks Sam and Dean for help in a case in [Πρέπει να είστε εγγεγραμμένοι και συνδεδεμένοι για να δείτε αυτόν το σύνδεσμο.] involving a man who is going through a metamorphosis into a [Πρέπει να είστε εγγεγραμμένοι και συνδεδεμένοι για να δείτε αυτόν το σύνδεσμο.]—a monstrous creature that consumes human flesh. During the hunt, Sam lashes out on Dean, saying he is tired of how Dean looks at him like a freak. Sam and Dean further separate as the tension increases between them. Despite attempting to prevent it, the man completes his transformation when the hunter tries to kill both him and his pregnant wife and he can't overcome his instincts anymore. He kills the hunter, but retains enough control to spare his wife. When the man tries to kill Dean, Sam is forced to kill him. Seeing what the man went through, Sam decides to stop using his powers.