Castle Season 4 Episode 14 ‘Blue Butterfly’ Preview More tidbits on Castle’s 1940s episode, which airs tonight, from show creator Andrew W. Marlowe. Castle Season 4 Episode 14 ‘Blue Butterfly’ Preview. Related Posts :2015-2016 In Review: Cancellations, Renewals,... 2014-2015 In Review: Cancellations, Renewals,... Zombies Cannot, And Will Not, Be Stopped May Madness Final: Castle vs. M*A*S*H Share this post:Share this:TwitterFacebook