Castle will be back on the small screen in September, and when we caught up with Seamus Dever at the ABC TCA cocktail party last night, we asked him which TV show he thinks would be the best pick for a potential crossover episode. He voted for Scandal, which, much like Castle, has a huge online fanbase. Seamus talked about how Castle's Twitter community has become an integral part of the show and what we can expect from the upcoming sixth season — from more murders to some troubled relationships.
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