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Neil Patrick Harris - (Billy A.K.A. Dr. Horrible) Nathan Fillion - (Captain Hammer) Felicia Day - (Penny) Simon Helberg Production Credits: Ryan Green (Cinematographer) Joss Whedon (Composer (Music Score)) Jed Whedon (Composer (Music Score)) Shawna Trpcic (Costume Designer) Joss Whedon (Director) Lisa Lassek (Editor) Michaek Boretz (Producer) David Burns (Producer) Joss Whedon (Screenwriter) Maurissa Tancharoen (Screenwriter) Zack Whedon (Screenwriter) Jed Whedon (Screenwriter)

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