Spoiler! Spoiler Photos of Castle Season 5, Episode 6: "The Final Frontier": Castle and Beckett Visit the Set of Nebula 9! 4 of 24 Prev Autoplay Next Share Tweet October 17, 2012 at 09:39AM EDT by Lindsay Dreyer Related: Castle, Spoilers, Season 5 Episode 6 full size Credit: Ron Tom/ABC Television Group © 2011 Disney Ed Quinn Guest Stars as Gabriel Winters in Castle Season 5, Episode 6: "The Final Frontier"
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