Next week, the CW will air the season finale of "Supernatural" after broadcasting "Smallville" finale on May 13. A new sneak peek to the episode has been offered for fans viewing pleasure, showing that the story will pick up shortly after the last episode ended.
As Castiel insists on finding Purgatory and using the souls to defeat Raphael, Dean, Sam and Bobby talk about an old Campbell journal that holds some secrets to opening a door to Purgatory. Having not done with one problem yet, Dean receives a bad news from Ben who is in panic after some men broke into their house and killed Lisa's new boyfriend.
Dean's attempt to save Ben and Lisa will make the first hour of the two-hour season finale. The second hour, meanwhile, will see the wall coming down in Sam's head and all hell breaking loose, but Dean and Bobby have no idea how to help him.
"Let It Bleed" and "The Man Who Knew Too Much" will air Friday, May 20 starting at 9/8c.