Castiel tries to 'speak' to Dean after his resurrection, but all Dean hears is a piercing sound. When Pamela Barnes conducts a seance to reveal the being who saved Dean, Castiel warns her off, but she persists and is blinded when she encounters him. Again, while Dean is alone in the hotel room in Pontiac, Castiel 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 Castiel, and so he and Bobby prepare an empty warehouse with protective sigils and symbols and Bobby performs a summoning ritual. When Castiel appears, Bobby and Dean shoot him with rock salt to no effect. Dean stabs Castiel with Ruby's Knife, also to no avail. Castiel 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."