Ready to Live Free or Twi-Hard, Supernatural viewers?

You better be on Friday, as this CW hit sets its upcoming episode in the world of vampires, as Dean gets bitten by a blood sucker and gets transformed into one.

Producer Sera Gamble has said she was careful not to cite The Twilight Saga or The Vampire Diaries in the episode, saying in an interview last month she has "great respect" for these franchises. Viewers should also have great fun watching Supernatural sort of spoof them.

Check out the following preview for this highly-anticipated installment.

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Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.