Supernatural

Season 4, Episode 2

Episode Title: Are You There, God? It's Me, Dean Winchester

Air Date: 2008-09-25

Overview:

After Dean's encounter with Castiel, Dean, Sam and Bobby brush up on their biblical lore when they're attacked by the vengeful spirits of people from the Winchesters' past. They're warned it's a sign that someone is trying to break seals which will bring on the apocalypse.