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 DB Woodside Lance Carlberg Guest Star Abigail Spencer Sarah Reed Guest Star Perrey Reeves Helen Parker Guest Star Alex Skuby Charlie DePetro Guest Star Matt Champagne Andy Berman Guest Star Nick Jaine Forensic IT Guy Guest Star Link Baker Officer Guest Star Andrew W. Marlowe Executive Producer Armyan Bernstein Executive Producer Barry Schindel Executive Producer Rob Bowman Executive Producer Laurie Zaks Executive Producer Elizabeth Davis Writer Helen Shaver Director