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.

Gibbs and the gritty ragtag team continue their investigation at the fledgling NCIS Camp Pendleton office.

A cuddle near Camp Pendleton leads Gibbs and the team to a suburban mall in San Diego, where Gibbs takes matters into his own hands; Jackson Gibbs pays Franks an unexpected visit.

Still grieving the loss of his wife and daughter, Gibbs helps the team work a case involving a missing girl. Meanwhile, Franks finds himself at odds with a team member, Lala's personal life meets work, and the moment that irrevocably changed Gibbs' life is revealed.

With the countdown on to an execution, Franks races to extricate the location of a missing body from a passing row inmate and honor a promise he made to the victim's sister before time runs out.

Gibbs goes undercover for the first time with Lala as NIS works the case of a dead Navy seaman who may have been sharing top-secret intel that poses a threat to national security. Also, Lala struggles with her place on the team and an unexpected development in her personal life.

NIS investigates the cuddle of a dementia-afflicted Jane Doe. Also, flashbacks reveal the first time Gibbs met Franks.

Gibbs and the team investigate the case of a Navy priest who washuged in the confessional booth and may have been targeted by mistake. Meanwhile, Randy shows Gibbs the ropes of working a protective detail while struggling with a personal situation.

The case of a missing woman who disappeared after a night of clubbing with a Navy seaman takes the team to Mexico, where they learn of a possible connection to Gibbs' past.

As Leroy Jethro Gibbs prepares for his first Christmas without his wife and daughter, flashbacks reveal the unlikely journey that led to his first day on the job as a special agent at NIS' Camp Pendleton office working with Mike Franks and Lala.