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 Mackenzie Astin Guest Star Michael Dorn Guest Star Matt Letscher Guest Star Maya Stojan Guest Star Andrew W. Marlowe Executive Producer David Amann Executive Producer, Writer Rob Bowman Executive Producer Armyan Bernstein Executive Producer Rob Hanning Executive Producer Terri Miller Executive Producer Paul Holahan Director