51

Nathan Fillion

as Richard Castle

44

Stana Katic

as Kate Beckett

28

Molly Quinn

as Alexis Castle

47

Tamala Jones

as Lanie Parish

45

Seamus Dever

as Kevin Ryan

52

Jon Huertas

as Javier Esposito

61

Penny Johnson

as Captain Victoria Gates

79

Susan Sullivan

as Martha Rodgers

65

Ruben Santiago-Hudson

as Captain Roy Montgomery

About Castle

About

After a serial killer imitates the plot of his books, a novelist works alongside an NYPD detective to solve crimes. The show ran for eight seasons and 173 episodes. 

Trivia

Nathan Fillion won the People's Choice Award for Favorite Crime Drama TV Actor in 2016 for his role on the show.