In 1991, years prior to the events of NCIS, Leroy Jethro Gibbs starts his career as a newly minted special agent at the fledgling NCIS Camp Pendleton office, where he forges his place on a gritty, ragtag team led by NCIS legend Mike Franks.

Austin Stowellas Leroy Jethro Gibbs
Kyle Schmidas Mike Franks
Mariel Molinoas Lala Dominguez
Tyla Abercrumbieas Mary Jo Hayes
Diany Rodriguezas Vera Strickland
Caleb Footeas Bernard 'Randy' Randolf
Mark Harmonas Older Leroy Jethro Gibbs (voice) (uncredited)
Patrick Fischleras SAC Cliff Wheeler
Julian Black Antelopeas Dr. Témet Téngalkat
Bobby Moynihanas Woodrow 'Woody' Browne
Kevin Kiner