The CW Network series Supernatural is enhancing their fanboy credibility by signing actress Felicia Day to guest star in Episode 7.20: The Girl With the Dungeons and Dragons Tattoo, which is set to air Friday, April 27.

If you couldn't tell from the title, this episode is a send-up of The Girl with the Dragon Tattoo, and features Felicia Day as a Lisbeth Salander-like computer hacker, who gets involved with Sam (Jared Padalecki) and Dean (Jensen Ackles). Here's what Supernatural executive producer/showruner Sera Gamble had to say about Felicia Day's character, Charlie.

"Felicia plays a girl named Charlie who is sort of a lowly tech working in one of Dick Roman's companies. She's an amateur computer hacker and unwittingly gets wrapped up in Sam and Dean's problems. It's a classic story of an everyday girl who does not want to be in a whistleblower position."

It is said that Charlie may be able to help Dean get closer to Dick Roman (James Patrick Stuart), who was taken over by the Leviathans. Supernatural returns tonight with Episode 7.16: Out With the Old, the first new episode in four weeks.

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