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The reason I started watching Castle was Nathan Fillion. I loved Firefly and I was fan of a number of other projects he’d been in, like Buffy the Vampire Slayer, Dr. Horrible, Waitress, and others. I also knew Susan Sullivan had a long acting career and that Stana Katic had had a number of small parts in popular TV shows before being cast as Kate Beckett.  So I started to wonder if they’d ever worked on the same TV series…