They're all longshots, but imagine the possibilities
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You've seen him in: "Castle"
Why? While "Doctor Who" doesn't need to add to its cult fan base, Fillion comes packing his own thanks to his role as Captain Malcolm Reynolds in "Firefly." As one of Joss Whedon's chosen ones, he's more than proven his way with rapid fire dialogue, and hey, he's got to be getting tired of the police procedural routine on "Castle," right? It also doesn't hurt that he and John Barrowman (Captain Jack Harness on the "Doctor Who" spin-off "Torchwood") have the same leading-man look.
-Liane Bonin Starr