Don McGill Creator Donald P. Bellisario Creator, Executive Producer, Writer Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor Sasha Alexander NCIS Special Agent Caitlin Todd Actor Michael Weatherly NCIS Special Agent Anthony "Tony" Dinozzo Actor Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor David McCallum Dr. Donald "Ducky" Mallard Actor Brian Dietzen Jimmy Palmer Guest Star Joe Spano Senior FBI Agent T.C. Fornell Guest Star Alicia Coppola Lt. Cmdr. Faith Coleman Guest Star Cleo King Della Robinson Guest Star Stacy Edwards Cmdr. Janice Byers Guest Star Mike Starr Monroe Cooper Guest Star Ely Pouget Julie Watson Guest Star Garette Ratliff Henson Young Cpl. Ernie Yost Guest Star Tim DeZarn David Runion Guest Star Molly Hagan Audrey Vetter Guest Star Nathan Wetherington Ensign Evan Hayes Guest Star Paul Rae Steve Hager Guest Star Kevin Sizemore Sgt. William Moore Guest Star Mary Pat Gleason Nurse Wells Guest Star Frank Military Writer James Whitmore Jr. Director Gil Grant Writer Terrence O'Hara Director Jeff Woolnough Director Stephen Cragg Director Christopher Crowe Writer Roger Director Director Dennis Smith Director Thomas J. Wright Director John C. Kelley Writer George Schenck Writer George Schneck Writer Jack Bernstein Writer Carlos Coto Writer Frank Cardea Writer