Nathan Fillion Richard Castle Actor Stana Katic NYPD Captain Kate Beckett Actor Susan Sullivan Martha Rodgers Actor Molly C. Quinn Alexis Castle Actor Ruben Santiago-Hudson Captain Roy Montgomery Actor Tamala Jones Lanie Parish Actor Jon Huertas NYPD Detective Javier Esposito Actor Seamus Dever NYPD Detective Kevin Ryan Actor Michael Trucco Detective Tom Demming Guest Star William R. Moses Blake Wilder Guest Star Julie Claire Lisa Jenkins Guest Star Jennifer Hall Rebecca Strong Guest Star Kasey Mahaffy Lance Newman Guest Star Ella Thomas Natasha Piper Guest Star Stephen Full Benny Guest Star Paul Carafotes Lukas Canby Guest Star Andrew W. Marlowe Executive Producer Armyan Bernstein Executive Producer Barry Schindel Executive Producer Rob Bowman Executive Producer Laurie Zaks Executive Producer René Echevarria Writer John Terlesky Director