Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor Sasha Alexander NCIS Special Agent Caitlin Todd Actor Michael Weatherly NCIS Special Agent Anthony "Tony" Dinozzo Actor Pauley Perrette Forensic Specialist Abby Sciuto Actor David McCallum Dr. Donald "Ducky" Mallard Actor Sean Murray NCIS Special Agent Timothy McGee Guest Star Erin Wiley Sands Cpl. Patricia McClain Guest Star Laz Alonso Staff Sgt. Steven Washington Guest Star Sam Witwer Staff Sgt. Rafael Guest Star Bellamy Young A.T.F. Special Agent Melinda Stone Guest Star Scott MacDonald Roger Cooke Guest Star Brant Cotton Militia Member Guest Star Michael Graziadei Chuck Guest Star Laurence Cohen Scott Guest Star Stuart Stone Dillon Guest Star Brian Dietzen Jimmy Palmer Guest Star Kevin Sizemore Sgt. William Moore Guest Star Adam Hendershott Josh Guest Star Donald P. Bellisario Executive Producer Terrence O'Hara Director Bob Gookin Writer