|Location||no fixed address|
|Episode(s)||4.01 Lazarus Rising|
Castiel is the Angel who rescued Dean from Hell, according to Castiel on a command from God. His handprint is burnt into Dean's arm.
His true voice is piercing to the human ear and looking on his true visage will burn a human's eyes from their head, as Pamela Barnes found when she tried to summon him in a seance. It will also burn the eyes of humans possessed by demons as shown in the diner scene when Sam is attacked by a blind demon. When he meets Dean he is inside the body of a man he says "prayed for it".
Castiel in lore
According to "Dictionary of Angels: Including the Fallen Angels", Castiel is an Angel Of Thursday in the occult lore. This may be a reference to the fact that Supernatural airs on a Thursday night on The CW.