Nathan Fillion Richard Castle Actor Stana Katic NYPD Captain Kate Beckett Actor Susan Sullivan Martha Rodgers Actor Jon Huertas NYPD Detective Javier Esposito Actor Tamala Jones Lanie Parish Actor Seamus Dever NYPD Detective Kevin Ryan Actor Molly C. Quinn Alexis Castle Actor Ruben Santiago-Hudson Captain Roy Montgomery Actor Jamie Chung Romy Lee Guest Star Julia Nickson Mrs. Lee Guest Star Nolan Gerard Funk Brandon Guest Star Michelle Page Amanda Guest Star Kunal Sharma Spencer Guest Star Steve Talley Kent Scoville Guest Star Charlie Finn Ian Yankman Guest Star Caitlin Dulany Mrs. Kendall Guest Star Creagen Dow Max Heller Guest Star Patrick O'Connor Chris Markum Guest Star David A. Kimball Mr. Kendall Guest Star Keisuke Hoashi Mr. Lee Guest Star Peggy Dunne Mrs. Heller Guest Star Anita Finlay Margo Falcigno Guest Star Jesse D. Goins Spencer's Lawyer Guest Star Andrew W. Marlowe Executive Producer Armyan Bernstein Executive Producer Barry Schindel Executive Producer Rob Bowman Executive Producer, Director Laurie Zaks Executive Producer David Grae Writer