For 19 seasons, Mark Harmon portrayed Special Agent Leroy Jethro Gibbs on the hit TV series NCIS, which dramatises the work of the Naval Criminal Investigative Service based in Washington DC. Harmon narrates a prequel set in 1991 when young Leroy Jethro Gibbs (Austin Stowell) has just acquired his special agent status at the NCIS Camp Pendleton office. Special Agent Mike Franks (Kyle Schmid) is the seasoned operative in charge of the team which includes former Marine Cecilia 'Lala' Dominguez (Mariel Molino). Despite their differences, team members work closely together to crack tricky cases