That reaction pleases executive producer Eric Kripke. "The Grimm Brothers' fairy tales are coming to life in all their bloody, homicidal, cannibalistic glory. The monsters and ghosts the boys are up against are always based on folklore or modern urban legends, and we realized that the folklore most people know best had never been on the show: fairy tales."
By the episode's end, Sam makes a shocking discovery. Without spoiling too much, it's safe to say Dean's situation will get worse before it gets better. "I'm getting more and more nervous with each script," Ackles says. "Please write to Kripke. Tell him not to kill me."