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 David McCallum Dr. Donald "Ducky" Mallard Actor Robert Wagner Anthony DiNozzo Sr. Guest Star Larry Miller Ed Slater Guest Star Francois Chau Henry Deng Guest Star Ping Wu Peter Liu Guest Star Stephen Caffrey Kevin Braddish Guest Star Jacob Zachar Stevie Slater Guest Star Connie Jackson Elaine Guest Star E-Kan Soong Kenneth Dent Guest Star Alexandra Bokyun Chun Phyllis Wu Guest Star Cecile Cubilo Cosette Guest Star Shea Vaughn-Gabor Jen Guest Star Jason Marrs Joe 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, Writer Donald P. Bellisario Executive Producer Diana Valentine Director