It makes sense for Nathan Fillion to play a writer on ABC's Castle (Mondays, 10 pm/ET&PT). The son of retired English teachers, he's co-founded a charity, Kids Need to Read, to provide books for underfunded libraries. And while he's unpretentious about his own reading habits - he lists Robert Parker's Spenser novels among recent favorites - he revels in mystery novelist Rick Castle's occasional arrogance on the show. Best known for playing Captain Malcolm Reynolds in the TV show Firefly and the movie Serenity, and for his role as Joey Buchanan in One Life to Live, Fillion got his start performing improvisational comedy in his hometown of Edmonton, Alberta. Castle, which pairs him with alluring detective Kate Beckett (Stana Katic), lets him handle drama and comedy alike. But as he explained to us, he plays them both the same.
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