Season 9 introduces the angel Gadreel, who originally poses as Ezekiel, played by Tahmoh Penikett and Padalecki. After Sam is seriously injured when he decides not to seal Hell, Gadreel comes to Dean in response to his prayer for help, possesses Sam to heal him, and becomes Dean's ally. However, Gadreel's true identity is later revealed by Metatron to be the guardian who had allowed Lucifer into the Garden of Eden and was imprisoned until the fall. Gadreel then allies with Metatron in an attempt to redeem himself and lead the angels back to Heaven. He kills Kevin Tran and is later expelled from Sam and possesses his original vessel again. However, after Metatron begins sacrificing angels for his plans, Gadreel becomes regretful and joins Sam, Dean and Castiel.