I Believe the Children Are Our Future (S05E06)

Fairy tales do come true! Sam and Dean investigate a series of odd murders that strangely resemble fairytales and urban legends. The brothers track down an 11-year-old boy named Jesse (guest star Gattlin Griffith) and realize that whatever Jesse believes is coming true. Castiel tells Sam and Dean that Jesse is a serious threat and needs to be eliminated. (Warner Bros. UK)