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 Rachel Boston Penny Marchand Guest Star Paige Rowland Loreen Carter Guest Star David Gianopoulos Albert Moreno Guest Star Rick Ravanello Steve Adams Guest Star Kieren Hutchison Cody Donnelly Guest Star Evan Helmuth Nick Johnston Guest Star Mercedes Mason Marina Casilla Guest Star Andrew W. Marlowe Executive Producer Rob Bowman Executive Producer Laurie Zaks Executive Producer David Amann Executive Producer Moira Kirland Writer John Terlesky Director