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 John Finn Gen. Charles T. Ellison Guest Star Katherine Cunningham Navy Lt. Laura Ellison Guest Star Sean Carrigan Michael Vinton Guest Star Angela Trimbur Nicole Trainer Guest Star Lucas Kerr Holden Baxter Guest Star Preston Jones Navy Petty Officer 1st Class David Collins Guest Star Matty Castano Eric Guest Star Nayo Wallace Doctor 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 Jennifer Corbett Writer Thomas J. Wright Director