Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Maria Bello NCIS Special Agent Jacqueline "Jack" Sloane Actor Emily Wickersham NCIS Special Agent Eleanor "Ellie" Bishop Actor Brian Dietzen Dr. Jimmy Palmer Actor Duane Henry MI6 Officer Clayton Reeves Actor Rocky Carroll NCIS Director Leon Vance Actor, Director David McCallum Dr. Donald "Ducky" Mallard Actor Jamie Kaler Christopher Bell Guest Star Gabrielle Carteris Julie Bell Guest Star April Brinson Genevieve Bell Guest Star Naomi Grace Kayla Vance Guest Star Yvette Monreal Maya Guzman Guest Star Anjali Bhimani Samantha Petrie Guest Star Geoffrey Rivas Ricardo Guzman Guest Star Diandra Lyle Alexandria P.D. Detective Karen Stradivarius Guest Star Travis Johns Martin Curtis Guest Star Timothy Davis-Reed Edison Rawls Guest Star James Austin Kerr Phil Guest Star Valeria Maldonado Rachel Guest Star Ken Luckey John Kendall Guest Star Lizze Broadway Mandy Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer Scott Williams Executive Producer Donald P. Bellisario Executive Producer Brendan Fehily Writer