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 Joseph Lee Anderson Marine Lance Corporal Bernard "Barney" Ernest Williams Guest Star Dana L. Wilson Doctor Erica Bell Guest Star Anastasia Baranova Melissa Canon Guest Star Devan Chandler Long NCIS Lead Evidence Custodian Terry Keller Guest Star Brent Bailey Kyle Freeman Guest Star David Carpenter Henry Hoss Guest Star Ellen Ratner Department of Army Security Guard May Stern Guest Star Jennifer Marshall Marine Sergeant Francesca Rinaldi Guest Star Jeffrey Larson Department of Army Security Guard Ian Nowitski Guest Star Christopher Carrington Navy Seaman Ronald "Ronny" T. Jones Guest Star Scott Menville Army Sergeant Donald "Donny" Pretorius Guest Star Oren Skoog Fanny-Packed Tourist 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 Christopher J. Waild Writer Michael Zinberg Director