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 Rafi Silver Qasim Naasir Guest Star Mary Stuart Masterson Congresswoman Jenna Flemming Guest Star Joe Spano Senior FBI Agent T.C. Fornell Guest Star Robert Wagner Anthony Dinozzo Sr. Guest Star Tony Gonzalez NCIS Special Agent Tony Francis Guest Star Ryan Doom George Bishop Guest Star Jesse Johnson Robbie Bishop Guest Star John Charles Meyer Ronald Ayers, Brendan Peters Guest Star Evan Arnold Gareth Bainbridge Guest Star Charlie Bodin Keith Guest Star Chas. Floyd Johnson Executive Producer Gary Glasberg Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer, Writer George Schenck Executive Producer Steven D. Binder Executive Producer, Writer Scott Williams Executive Producer, Writer Donald P. Bellisario Executive Producer Gina Lucita Monreal Writer Brendan Fehily Writer Arvin Brown Director Thomas J. Wright Director Jennifer Corbett Writer Terrence O'Hara Director Tony Wharmby Director Ed Ornelas Director