Castle star Nathan Fillion stopped by Good Morning America on May 4, 2012 to dish on the Season 4 finale, working with Molly Quinn and Susan Sullivan, and which superhero he'd love to play.
Warning: This clip contains minor spoilers and a sneak peek from the Castle Season 4 finale, "Always."
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05.4.2012 / 07:31 PM EDT by Wetpaint Staff
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