Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Michael Weatherly NCIS Special Agent Anthony "Tony" Dinozzo Actor Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor Brian Dietzen Dr. Jimmy Palmer Actor Emily Wickersham Probationary NCIS Agent Eleanor "Ellie" Bishop Actor Rocky Carroll NCIS Director Leon Vance Actor David McCallum Dr. Donald "Ducky" Mallard Actor Joe Spano Senior FBI Agent T.C. Fornell Guest Star Robert Wagner Anthony Dinozzo Sr. Guest Star Leslie Hope Secretary of the Navy Sarah Porter Guest Star Sarah Clarke FBI Special Agent Tess Monroe Guest Star Jon Cryer Dr. Cyril Taft Guest Star Duane Henry Clayton Reeves Guest Star Scottie Thompson Jeanne Benoit Guest Star Laura San Giacomo Dr. Grace Confalone Guest Star Vince Nappo Jacob Scott Guest Star Sandra Nelson Jessica Terdei Guest Star Virginia Williams Leah Ramsey Guest Star Mia Barron Dr. Katrina Griffin Guest Star Gary Glasberg Executive Producer, Writer Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer, Writer George Schenck Executive Producer, Writer Steven D. Binder Executive Producer Scott Williams Executive Producer, Writer Donald P. Bellisario Executive Producer Jennifer Corbett Writer Gina Lucita Monreal Writer Brendan Fehily Writer Christopher J. Waild Writer Dennis Smith Director Terrence O'Hara Director Tony Wharmby Director