Supernatural.tv has posted a screenshot of the latest edition of Cult Times magazine where Smallville creator Eric Kripke reveals that Jason Vorhees will appear in an upcoming episode:

"We have Jason from Friday the 13th, the character with the hockey mask ... He shows up in episode 10. We have cleared the rights to actually use Jason. We have a twist on it so it is not really Jason out there but we have found an interesting way to bring him in so Sam and Dean fight Jason from Friday the 13th. In our world, that is a pretty cool guest star."

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