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 Kyle Secor Guest Star Scott Paulin Guest Star Niko Nicotera Guest Star Stacy Edwards Guest Star Mekenna Melvin Guest Star Andrew W. Marlowe Executive Producer, Writer Rob Bowman Executive Producer Laurie Zaks Executive Producer David Amann Executive Producer John Terlesky Director