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 Ben Bode Dan Reynolds Guest Star Lise Simms Kenna Reynolds Guest Star Ralph Cole Jr. Gary Clifford Guest Star David Pressman Lewis Dacey Guest Star Ellie Araiza Sheila Mooney Guest Star Mann Alfonso Edgar Fitz Guest Star Don Brunner David Guest Star Cory Tucker Brendan Guest Star Eliza Shin Myrna Guest Star Nick Alvarez Jonny Guest Star Robin McDonald Loni Braddish 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 Terrence O'Hara Director