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 John Pyper-Ferguson Dean Donegal Guest Star Ever Carradine Mirielle Lefcourt Guest Star Rick Hearst Dr. Elliot Lefcourt Guest Star Carmen Argenziano Mario Rivera Guest Star Ken Baumann Ashley Guest Star David Dean Bottrell Byron H. Singer Guest Star Presciliana Esparolini Teresa De La Torre Guest Star Andrew W. Marlowe Executive Producer Rob Bowman Executive Producer Laurie Zaks Executive Producer David Amann Executive Producer Matt Pyken Writer Bryan Spicer Director