4x16 On the Head of a Pin

In [Πρέπει να είστε εγγεγραμμένοι και συνδεδεμένοι για να δείτε αυτόν το σύνδεσμο.], someone has found a weapon that can kill angels and is responsible for several murders. Having captured Alastair, Castiel and Uriel demand that Dean use the torturing skills he learned in Hell to extract information from him so they can stop the murders. Dean refuses, but they transport him there and refuse to let him leave until he finally agrees to it. Anna comes to Castiel when he is alone and questions the morality of forcing Dean to torture Alastair, going so far as to question if God is even the one giving orders anymore, but Castiel rejects her and forces her to leave when she suggests that he work with her. Meanwhile, Sam calls upon Ruby to help him locate Dean because he doesn't believe that Dean can get the information. Sam then begins drinking Ruby's blood in order to regain his diminished power. Drinking her blood is how his powers have grown so much early in the season, and his decision to not drink it is why his powers had weakened. Alastair refuses to break despite the torture a vengeful Dean inflicts on him, but does taunt Dean by telling him that he, Dean, had broken the first seal when he began torturing people in Hell. An unseen force then frees Alastair, who tries to kill Dean and exorcise Castiel. Sam arrives and uses his increased power to torture and kill Alastair after the latter admits that no demon is behind the angel murders. Dean is subsequently taken to a hospital for the injuries he sustained from Alastair's attack. Castiel seeks Anna out and pleads for her to tell him what to do, but she tells him that he must learn to think for himself. Castiel soon realizes who is behind the murders and Alastair's escape: Uriel. Uriel had killed the angels who refused to join him in releasing Lucifer, and had freed Alastair to kill Dean and keep the blame on the demons. When Castiel refuses to join him, Uriel tries to kill him, but is killed by Anna instead, saving Castiel. Afterward, Castiel visits Dean in the hospital and confirms that Dean broke the first seal with his actions in Hell. Dean is left shattered by the revelation, telling Castiel to find someone else to save the world, because he can't.