Jack: I have to find my father. He'll protect me.
Sam Winchester: Jack, you gotta listen to me. That's not what really Lucifer does.
Jack: Lucifer? No, that's not his name. My father is Castiel.
Sam Winchester: What?
Jack: My mother, she said Castiel, he would keep me safe. She said the world was a dangerous place. That's-that's why I couldn't be a baby or a child. I... That's why I had to grow up fast. That's why I chose him to be my father. Where is he?
Sam Winchester: He's dead.
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From: Supernatural