Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Jennifer Esposito NCIS Special Agent Alexandra "Alex" Quinn Actor Emily Wickersham NCIS Probationary Agent Eleanor "Ellie" Bishop Actor Brian Dietzen Dr. Jimmy Palmer Actor Duane Henry MI6 Officer Clayton Reeves Actor Rocky Carroll NCIS Director Leon Vance Actor David McCallum Dr. Donald "Ducky" Mallard Actor Mercedes Ruehl Marie Quinn Guest Star Bruce Boxleitner Vice Adm. C. Clifford Chase Guest Star Philip Smithey Clint Asher Guest Star Michael Drayer Carlo Hackett Guest Star Brent Briscoe Buzz Guest Star Craig Robert Young Ian Lipovetskiy Guest Star Raychel Diane Weiner Reese Goldman Guest Star Erica Luttrell Allison Asher Guest Star Andrew David Bridges Navy Lt. Lazlo Downey 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 Ed Ornelas Director