Mark Harmon
Leroy Jethro Gibbs (16 eps)
Sean Murray
Timothy McGee (16 eps)
Wilmer Valderrama
Nick Torres (16 eps)
Brian Dietzen
Jimmy Palmer (16 eps)
David McCallum
Dr. Donald 'Ducky' Mallard (16 eps)
Rocky Carroll
NCIS Director Leon Vance (16 eps)
Emily Wickersham
Ellie Bishop (16 eps)
Diona Reasonover
Kasie Hines (16 eps)
Pam Dawber
Marcie Warren (4 eps)
Juliette Angelo
Emily Fornell (archive footage) (3 eps)
Joe Spano
Tobias TC Fornell (3 eps)
Katrina Law
Jessica Knight (2 eps)
Vito D'Ambrosio
Jonny Zucado (2 eps)
Nick Boraine
Merriweather (2 eps)
Anna Grace Barlow
Karen / Sasha Myshkin (2 eps)
Victoria Gabrielle Platt
NCIS Special Agent Veronica Tyler (2 eps)
Connie Jackson
Elaine (2 eps)
Margo Harshman
Delilah Fielding (2 eps)
Carlos Acuña
Milo the Guard (1 eps)
Sade Devine
Jasmine Tyler (1 eps)
Shirley Jordan
Mary Tyler (1 eps)
Grace Powell
Joyce (1 eps)
Brian Stepanek
Karl Chunk / Homeless Guy / Arda Dogan (1 eps)
Wendy Worthington
Gila Shaw (1 eps)
Sean Harmon
Young Leroy Jethro Gibbs (1 eps)
Adam Campbell
Young Ducky (1 eps)
Thomas Crawford
Dr. Magnus (1 eps)
Louis Mustillo
Emilio 'Freckles' Zucado (1 eps)
Thomas F. Wilson
Angus Demint (1 eps)
Mariana Klaveno
Margot Demint (1 eps)
Anthony Konechny
Simon Felcher (1 eps)
Bahni Turpin
Camille West (1 eps)
Tamika Simpkins
Jill (1 eps)
Gabrielle Walsh
Michelle Stamos (1 eps)
Robert Mailhouse
Malcolm Lucas (1 eps)
Jennifer Baxter
Sienna Michaels (1 eps)
Chris Butler
Clarence (1 eps)
Chet Grissom
Rupert Kittridge (1 eps)
Isiah Adams
Chad / Vladmir Izikov (1 eps)
Anthony L. Fernandez
Luis Carter (1 eps)
Michael Goldsmith
Ben Mitchell (1 eps)
Dominique Columbus
Corey Jackson (1 eps)
Ismail Bashey
Nabi (1 eps)
Lawrence Kao
Pete Cannizaro (1 eps)
Adam Ferrara
Sammy Craig (1 eps)
Shane Coffey
Sean Greco (1 eps)
Annie Little
Meri Dade (1 eps)
Sarah Grace White
Samantha Watkins (1 eps)
Patrick Cox
Parking Enforcement Officer Carl Bjork (1 eps)
Nancy Linehan Charles
Ruthann Harrison (1 eps)
Max Adler
Luke Stana (1 eps)
Amrapali Ambegaokar
July Wunderman (1 eps)
Hugo Armstrong
NCIS Inspector General Eugene Coyle (1 eps)
William Allen Young
U.S. Secretary of Defense Moses McClaine (1 eps)
Andrew Pifko
Miles Thatcher (1 eps)
Daniel Peera
Nasser Al-Kamal (1 eps)
Steven Bauer
Miguel Torres (1 eps)
Tijuana Ricks
CIA Agent Pamela Walsh (1 eps)
Christine Dunford
Jeri Fleckman (1 eps)
Alex Feldman
Retired Marine Sergeant Thomas Baird (1 eps)
David Carzell
Michael Hodge (1 eps)
Chris Boudreaux
Jesse Duncan (1 eps)
Angela Lin
Asst US Attorney Sheila Addison (1 eps)
Amanda Detmer
Charlotte Bodizinski (1 eps)
Michael Chieffo
Randy Devereaux (1 eps)
Sarah Stouffer
Hanna Devereaux (1 eps)
Troy Blendell
Bernard Wilson (1 eps)
Michael Rupnow
Parker James (1 eps)
Karri Turner
Micki Kaydar (1 eps)
Chris Browning
NCIS REACT Supervisory Special Agent Tom Dalton (1 eps)
Edward Gelhaus
NCIS REACT Special Agent Edward Madden (1 eps)
West Liang
Peter Kessler (1 eps)
Donzaleigh Abernathy
Ronda Ellis (1 eps)
Rafael Petardi
Afrim Murati (1 eps)
Elayn J. Taylor
Odette Malone (1 eps)
Arnold Chon
Bank Manager Charles Park (1 eps)
Jack Fisher
Phineas (1 eps)
Tiago Martinez
5-Year-Old Boy (1 eps)
Laura San Giacomo
Grace Confalone (1 eps)
Noah Staggs
AA Member (1 eps)