Castle’s [ABC, Mondays, 10/9C] Nathan Fillion is a star waiting to happen. If you don’t believe me, just re-screen any of his work on television [Firefly, Buffy the Vampire Slayer, Desperate Housewives] or movies [Serenity, Waitress] – or the incredibly funny web mini-series, Dr. Horrible’s Sing-a-long Blog – and you’ll see what I mean. He […]