Last week, we posted the official promo pictures for Castle Season 4, Episode 22: "Undead Again." And now, we're getting an even closer look at the zombie-themed episode with these killer, thriller behind-the-scenes pictures. 

Credit: Richard Cartwright /ABC Television Group © 2011 Disney Photo: Stana Katic Gets Attacked by Zombies on the Set of Castle Season 4, Episode 22: "Undead Again"
Credit: Richard Cartwright /ABC Television Group © 2011 Disney Photo: Nathan Fillion Gets Mobbed by the Walking Dead in Castle Season 4, Episode 22: "Undead Again"
Credit: Richard Cartwright/ABC Television Group © 2011 Disney Photo: Nathan Fillion and Stana Katic Share a Laugh on the Set of Castle Season 4, Episode 22: "Undead Again"

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