Castiello tries to 'speak' to Dean after his resurrection, but all Dean hear's is a piercing sound. When [[Pamela Barnes]] conducts a seance to reveal the being who saved Dean, Castiello warns her off, but she persists and is blinded when she encounters him. Again, while Dean is alone in the hotel room in Pontiac, Castiello tries to speak to Dean, but his 'voice' shatters all the glass in the room and makes Dean's ears bleed.
Dean is intent on summoning Castiello, and so he and Bobby prepare an empty warehouse with protective sigils and symbols and Bobby performs a summoning ritual. When
Castiello appears, Bobby and Dean shoot him with rock salt to no effect. Dean stabs Castiello with [[Ruby's Knife]], also to no avail. Castiello causes Bobby to pass out and then reveals to Dean that he is an angel, who saved him from Hell on God's command. "I gripped you tight and raised you from perdition." He tells Dean that God "has work for him."
==[[4.02 Are You There God? It's Me, Dean Winchester]]==
Castiello in lore==
According to [http://www.ascension-research.org/davidson.html "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.
==Castiello in fandom==
spn_castiello] - Castiello group on LJ* [http://community.livejournal.com/fromperdition/ fromperdition] - LJ fan community dedicated to Castiello* [http://community.livejournal.com/deancastiel/ deancastiel] LJ community to the relationship between Castiello and Dean