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 Stephen J. Cannell Himself Guest Star Michael Connelly Himself Guest Star James Patterson Himself Guest Star Michael Trucco Detective Tom Demming Guest Star Monet Mazur Gina Griffin Guest Star Mitch Pileggi Hans Brauer Guest Star Allison McAtee Andrea Fisher Guest Star Rick Worthy Jason Penn Guest Star Andrew W. Marlowe Executive Producer, Writer Armyan Bernstein Executive Producer Barry Schindel Executive Producer Rob Bowman Executive Producer, Director Laurie Zaks Executive Producer