Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Sean Murray NCIS Special Agent Timothy McGee Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Brian Dietzen Dr. Jimmy Palmer Actor Diona Reasonover Forensic Scientist Kasie Hines Actor Katrina Law NCIS Special Agent Jessica Knight Actor Rocky Carroll NCIS Director Leon Vance Actor, Director David McCallum Dr. Donald "Ducky" Mallard Actor Gary Cole FBI Special Agent Alden Parker Actor Amanda Schull Kay Barlow Guest Star Artur Zai Benson Navy Chief Warrant Officer Rafi Nazar Guest Star Denise Crosby Secretary of the Navy Hattie Taylor Guest Star Tarek Bishara Afghan Ambassador Tariq Dotani Guest Star Lisandra Tena Paramedic Maria Santiago Guest Star Kenajuan Bentley Navy Captain Oliver Royce Guest Star Shawn Patrick Clifford Mike Novaski Guest Star Jean St. James Woman on Videoconference Guest Star Crystal Rivers Another Woman on Videoconference Guest Star Daniel Curtis Lee SRT #1 Guest Star Daniel L. Rivera SRT #2 Guest Star Thomas McNamara Pilot #1 Guest Star Brittany Freeth Pilot #2 Guest Star Bryan Marcos Pilot #3 Guest Star Rome Stephens Singh Afghan MP #1 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 Brendan Fehily Writer