Nathan Fillion is a huge fellow nerd not so much for his role on Castle, but thanks to his work in the universe of Joss Whedon, on projects such as Firefly, Serenity, and Dr. Horrible's Sing-Along Blog. Fillon explained that he and the Avengers director are friends in real life, too. Photo: Actor Nathan Fillion poses at the WireImage Portrait Gallery At Comic-Con Hosted By Connected Kenneth Cole Reaction And Presented By Nintendo on July 23, 2011 in San Diego, California. (Photo by Michael Bezjian/WireImage)
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