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 Michael Trucco Detective Tom Demming Guest Star Scott Cohen Lt. Stan Holliwell Guest Star Abby Brammell Carol Thornton Guest Star Merrin Dungey Monica Finch Guest Star Aaron D. Spears Ike Thornton Guest Star Bruno Amato Fred Cana Guest Star Michael Ironside Victor Racine Guest Star Andrew W. Marlowe Executive Producer Armyan Bernstein Executive Producer Barry Schindel Executive Producer Rob Bowman Executive Producer Laurie Zaks Executive Producer Will Beall Writer John Terlesky Director