Regular cast members for the ABC homicide detective drama "Castle" include Nathan Fillion as Richard Castle, Stana Katic as Kate Beckett, Kevin Ryan played by Seamus Dever, Alexis Castle played by Molly Quinn and Jon Huertas as Javier Esposito. The show began in 2009 and follows Richard Castle's adventures as he helps a homicide unit solve crimes. Fillion's character is a murder mystery novelist by trade who works with the NYPD as a consultant.
The premise behind the show starts with Castle living with his teenage daughter, Alexis, and his mother while writing crime novels. A serial killer in New York begins mimicking scenes from Castle's books, so the author assists detective Beckett as the pair attempts to solve the murders before the killer strikes again. Fillion won People's Choice Awards in 2012 and 2013 for his role.
Beckett serves as a romantic foil to Castle. The detective has a no-nonsense approach to solving cases, while Castle uses storytelling background to get inside a killer's head. Beckett uses her mother's violent, unsolved murder as motivation to bring justice and closure to families of the victims. The on-screen couple's relationship turns into inspiration for some of Castle's novels as he works with NYPD officers.
The end of Season 7, in the spring of 2015, left many fans wondering if the show would return in the fall of that year, notes Us Magazine. As such, the show's creators finished a few huge plot points among major characters in "Castle."