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 Mary Stuart Masterson Congresswoman Jenna Flemming Guest Star Rafi Silver Qasim Naasir Guest Star Bruce Locke Kai Chen Guest Star Adam Silver Dabney Guest Star Tiffany Daniels Navy Lt. Cmdr. Renée Turner Guest Star Bob Stephenson Kevin Lane Guest Star Tyson Turrou Pete Guest Star Grace Rowe NCIS Special Agent Donna Andrews 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 David J. North Writer Michael Zinberg Director