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 Joe Spano Tobias "T.C." Fornell Guest Star Victoria Platt NCIS Special Agent Veronica "Ronnie" Tyler Guest Star Brian Stepanek Karl Chunk, Homeless Guy, Arda Dogan Guest Star Wendy Worthington Gila Shaw Guest Star Carlos Acuna Milo the Guard Guest Star Shirley Jordan Mary Tyler Guest Star Grace Powell Joyce Guest Star Sade Devine Jasmine Tyler 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 Michael Zinberg Director