<P> Castiel gets a job at a gas station and attempts to adjust to his new life as a human . He helps Dean hunt a rogue angel that is killing people in emotional pain, but later prays for help when Dean sends him away for the second time on Ezekiel's orders . Castiel is found by the neutral angel Muriel who heard his prayer . Muriel agrees to provide information but the two are captured by angels that have been trailing Muriel . Castiel and Muriel are taken to the anarchist angel Malachi, the leader of one side of the angel civil war (the other side being headed by the angel Bartholomew), and tortured for information on Metatron . Muriel is killed in the process . </P> <P> Eventually, Malachi leaves Castiel with the angel Theo who tells Castiel he wants to defect to Metatron's side . Castiel tricks Theo into releasing him and steals his Grace, transforming Castiel into an angel once more and at least restoring his powers . Castiel calls Dean and tells him that while he was held captive by Malachi he learned that the angel Ezekiel is dead and so the angel possessing Sam must be an impostor . </P> <P> After being contacted by Dean, Castiel, now wearing a new suit and trench coat and driving a stolen car as he can no longer teleport, returns to the bunker where he comes up with the plan to have Crowley help expel Gadreel from Sam . Castiel knocks Gadreel out and comforts Dean when the torture they have Crowley perform to bring forth Sam's mind proves too much for Dean . Castiel is furious to learn that the angel possessing Sam is actually Gadreel, blaming him for all the evil in the universe, but Dean calms him down . When Gadreel proves resistant to their efforts to expel him, Dean tries to have Castiel possess Sam to let him know of the situation but he can't without Sam's permission, and furthermore has no way to gain it due to Sam's mind being kept under by Gadreel . Crowley agrees to possess Sam instead in exchange for his freedom and though Castiel is reluctant, he removes Sam's anti-possession tattoo . The plan works and Sam expels Gadreel . After leaving Crowley to deal with Abaddon, Castiel heals Sam's injuries from the torture and informs him he can finish his healing from the Trials over time as Gadreel did most of the job . He remains behind with Sam as Dean leaves on his own . </P> <P> With his angelic powers partially restored, Castiel sets out to try and stop the angelic civil war . Having killed Bartholomew in self - defence, Castiel takes command of most of the Earth - bound angels, but finds himself opposed by Metatron, who is rallying angels to his side with the intention of painting Castiel as the villain of the piece . Although Castiel learns that his stolen grace will kill him eventually, he refuses Metatron's offer to side with him, eventually convincing Gadreel to ally with him in opposing Metatron's attempt to stage a coup of Heaven even as Metatron tricks the other angels into follow him by presenting Castiel as a despot willing to destroy everything to win the war, convincing angels to' suicide bomb' themselves and claim that Castiel told them to do it . Having gained access to Heaven's' back door' after Gadreel sacrifices himself, Castiel defeats Metatron and throws him into Heaven's prison . </P>

The supernatural played a part in the works of