Nathan Fillion Richard Castle Actor Stana Katic NYPD Captain Kate Beckett Actor Susan Sullivan Martha Rodgers Actor Molly C. Quinn Alexis Castle Actor Penny Johnson Capt. Victoria Gates Actor Tamala Jones Lanie Parish Actor Jon Huertas NYPD Detective Javier Esposito Actor Seamus Dever NYPD Detective Kevin Ryan Actor Annie Wersching Guest Star William Mapother Guest Star Maya Stojan Guest Star Andrew W. Marlowe Executive Producer Rob Bowman Executive Producer, Director Laurie Zaks Executive Producer David Amann Executive Producer, Writer