Ask Ausiello: Spoilers on सूपरनॅचुरल & More. 

"Coming up in the middle of the season, there's an episode titled 'Afterschool Special' in which the boys investigate a haunting at one of the high schools they attended as kids"
कीवर्ड्स: सूपरनॅचुरल, spoilers, cw, season 4