You may wonder how a new mystery/detective series could get you to watch when network and cable TV is saturated with them. For one thing, Nathan Fillion is the title star, playing Richard Castle. Can this really be the same person who played Dr.Pomattor in Waitress? Fan’s of Joss Whedon’s ‘Firefly’ and ‘Dr. Horrible’s Sing Along’ will also be familiar with Fillion. Like the great fictional detectives of the past, Castle uses a mix of comedy, romance, and whodunit to craft an engaging story arc that will keep you watching.