See 'Castle's Nathan Fillion & Seamus Dever Reunite on 'The Rookie' (PHOTOS)
Seamus Dever and Jon Huertas will be guest starring in the October 13 episode, "The Bet," and ABC released photos offering a look at the former's character interacting with Fillion's John Nolan. It looks like the former Detective Ryan may be on the wrong side of the law this time!
Also in this episode, Officer Nolan navigates building tension in his relationship with Jessica and a developing rapport with Grace as he works a high-stakes criminal case involving an undercover Homeland Security agent.
The Rookie, Season 2 Premiere, Sunday, September 29, 10/9c, ABC