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 Alyssa Milano Kyra Blaine Guest Star Brady Smith Greg Murphy Guest Star Graham Beckel Uncle Teddy Guest Star Joe Nieves Boyd Gamble Guest Star Mimi Kuzyk Sheila Blaine Guest Star Ryan Alosio Mike Weitz Guest Star Gina Hiraizumi Laurie Hill Guest Star Andrew W. Marlowe Executive Producer Armyan Bernstein Executive Producer Barry Schindel Executive Producer Rob Bowman Executive Producer Laurie Zaks Executive Producer Alexi Hawley Writer Terri Miller Writer Terence Paul Winter Writer Bryan Spicer Director