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 Pej Vahdat Nigel Hakim Guest Star Robin Karfo Zaiyema Guest Star Keon Alexander CIA Special Agent Nazy Rickman Guest Star Naomi Grace Kayla Vance Guest Star Alexa Hamilton British Deputy Ambassador Sybil Rigg Guest Star Chad Lindberg Joey Peanuts Guest Star James A. Watson Jr. Navy Vice Admiral Richard Hasley Guest Star Jim Meskimen Doctor Farrel Emerson Guest Star Rob Mainord Myron Holt Guest Star Cory Jacob NCIS Special Agent Rod Beecham Guest Star Jessica Gardner Olivia Kahn Guest Star Danielle Rayne Marine Colonel Leah Siffler Guest Star Lauren September Emma Thatcher Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer, Writer Scott Williams Executive Producer Donald P. Bellisario Executive Producer Tony Wharmby Director