Castle is an American comedy-drama police procedural television series on ABC which was created by Andrew W. Marlowe. It stars Nathan Fillion as Richard Castle, a famous mystery novelist, and Stana Katic as NYPD detective Kate Beckett. The series premiered as a midseason replacement on March 9, 2009. On May 12, 2016, it was announced that, despite several cast members signing one-year deals for a potential ninth season, the show would be canceled instead. During the course of the series, 173 episodes of Castle aired over eight seasons.