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 Ciera Payton Laurie Perkins Guest Star Tommy Savas Max Sanders Guest Star Angelo Tiffe Jed Hamilton Guest Star Jeff Griggs Peter Alden Guest Star June Schreiner Amy Barrett Guest Star Michael Canavan Navy Adm. Thomas Garscott Guest Star Mary Anne McGarry Fern Robbins Guest Star Katherine Disque Mary Barrett Guest Star David Lengel Carlton Laymer Guest Star Brad Grunberg Big Ed 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 Cindi Hemingway Writer Arvin Brown Director