Forgive My Sins
"I don't think you're hearing me, Cas," Dean snapped. "Since when did you jump on this angel bandwagon and turn your back on us?"
Although his words were sharp, there was grief dimming the light in Dean's eyes. For a brief moment, pity revealed itself on Castiel's face. Quietly, he reminded, "You know when, Dean."
- Part 1 of Forgive My Sins
Castiel is ambushed by some demons who manage to poison him. Ironically, it's the person who Castiel originally planned to kill who comes to his aid.
- Part 2 of Forgive My Sins
Dean returns from the bar to hear Sam arguing about Lilith with someone in their motel room. Unfortunately, Dean learns the person inside isn't much of a stranger after all.
- Part 3 of Forgive My Sins