<P> In "The Man Who Knew Too Much", Castiel tricks Crowley and Raphael, eventually absorbing the souls from Purgatory . He demonstrates his new power by killing Raphael with a simple snap of his fingers . While talking to Dean, who unsuccessfully begs him to give up the power, Sam sneaks up behind them and attempts to kill him with an angelic blade by stabbing Castiel in the back, but it has no effect . Castiel removes the blade, explains that he is no longer an angel, declaring himself their new God . He then glances at the three hunters before delivering an ultimatum: to profess their own loyalty and love unto him, or be destroyed . </P> <P> In "Meet the New Boss", Castiel begins exacting his new supremacy over the planet, working miracles and punishing religious hypocrites alike . However, when Castiel's vessel begins to become damaged and he begins to lose control of his power, Death reveals that he also absorbed creatures known as Leviathans from Purgatory . The Leviathans will destroy him if they are not released . Castiel seeks out the Winchesters' help, and reopens the portal with Death's assistance . Although the souls are returned, the Leviathans evade reentering Purgatory and take control of Castiel's vessel . In "Hello, Cruel World", the vessel begins to quickly break down . The Leviathans are forced to leave, dispersing into the local water supply nearby and leaving behind only Castiel's trench coat . </P> <P> In "The Born - Again Identity", it's revealed that Castiel survived . After the Leviathans left him, he made his way out of the river, naked, and ran into his future wife Daphne . However, the experience renders Castiel amnesic, but with his angelic powers intact . Going by the name "Emanuel", Castiel used his powers to heal people, though he didn't know where that ability and his power to see demon's true faces came from . After Sam is committed to a mental hospital as a result of the hallucinations of Lucifer he is suffering due to Castiel breaking his "mental wall", Dean searches for "Emanuel" and kills a demon that is holding his wife hostage . Castiel agrees to help Dean who doesn't tell him who he really is, but mentions what "Cas" had done to Sam . The two are joined by Meg, but upon reaching the hospital, find demons surrounding the entrance . As Castiel is the only one who can take them all down, Dean is forced to tell him the truth about who he really is and insists he has the power to kill the demons . Castiel manages to summon his power to kill demons and kills all of them, but doing so restores his memories . Castiel shows remorse for his previous actions and initially wants to leave, but Dean is able to convince him to help by giving him back his trench coat . Castiel finds Sam in time to save him from a demon torturing him to death with electro - shock therapy and tries to restore his mental wall, but can't as it's completely gone . Feeling sorry for what he had done, Castiel transfers the problem to himself and is haunted by visions of Lucifer like Sam was . Castiel is committed to the mental hospital, but is safe from the demons as only Meg knows he's alive and she takes a job at the hospital, presumably to look after him . In "Party On, Garth", Dean calls Meg and she reveals that Castiel's in the same condition, which Sam feels guilty about . </P> <P> In "Reading is Fundamental", Castiel is awakened when the Word of God--a tablet with information inscribed by an angel as dictated by God--is found by Sam and Dean . Although his torment has driven him insane, he explains that taking on Sam's pain has helped relieve some of his past burdens . He then explains what the Word of God is, but is unable to read it . Two angels from his former garrison arrive in pursuit of Kevin, a prophet who was awakened by the Word of God and drawn to it . The angel Hester tries to kill Castiel out of anger for his past actions, but she is instead killed by Meg . The other angel offers Castiel the chance to return to Heaven with him, but Castiel declines, explaining that he feels he no longer belongs there . The other angel then leaves, taking Kevin away to safety . Castiel comments to the Winchesters that he finds it amazing that he does not know what he is going to do next, and teleports away after giving them his blood . </P>

When does castiel get out of the mental hospital