Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Sean Murray NCIS Special Agent Timothy McGee Actor Emily Wickersham NCIS Special Agent Eleanor "Ellie" Bishop Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Maria Bello Special Agent Jacqueline "Jack" Sloane Actor Brian Dietzen Dr. Jimmy Palmer Actor Diona Reasonover Forensic Scientist Kasie Hines Actor Rocky Carroll NCIS Director Leon Vance Actor, Director David McCallum Dr. Donald "Ducky" Mallard Actor Scott William Winters Westley Clark Guest Star Joe Spano Tobias "T.C." Fornell Guest Star Rahnuma Panthaky Neera Kapoor Guest Star Garrett M. Brown Retired Marine General James Wallace Guest Star Naomi Grace Kayla Vance Guest Star Steve Olson Dylan Guest Star JT Neal Dean Guest Star Dionne Gipson Mallory Guest Star Kent Shocknek ZNN News Anchor Guy Ross Guest Star E-Kan Soong Kenneth Dent Guest Star Danielle Rayne Marine Colonel Leah Siffler Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer, Writer Scott Williams Executive Producer, Writer Donald P. Bellisario Executive Producer Christopher J. Waild Writer David J. North Writer Gina Lucita Monreal Writer Brendan Fehily Writer Jennifer Corbett Writer Tony Wharmby Director Michael Zinberg Director Terrence O'Hara Director James Whitmore Jr. Director