Television News Nathan Fillion returning to ABC in 'The Rookie' cop dramedy 10/27/2017 Nathan Fillion -- who starred on ABC's "Castle" for eight seasons -- is returning to the network with a new cop dramedy called "The Rookie." Read More RELATED NEWS From Tokyo to Las Vegas: Taylor Swift's flight to Super Bowl LVIII'Chucky' Season 3 trailer released by USA Network and Syfy'Quantum Leap' Season 2 visits L.A. riots, Salem Witch Trials, and more TAGS: Nathan Fillion Castle The Rookie