Prior to starting work on The Rookie, Nathan Fillion spent eight seasons starring as mystery novelist Richard Castle on the series Castle. It was, by far, the longest-lasting job of his career, and he was sad to see it end. But at least, he told us, the show left him with a lot of great memories and a lot of great friendships.(Click on the media bar below to hear Nathan Fillion)
Castle and The Rookie is currently streaming on Hulu.