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.

Still grieving the loss of his wife and daughter, Gibbs helps the team work a case involving a missing girl. The moment that irrevocably changed Gibbs' life is revealed.

NIS investigates the murder 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 was killed 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.

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.

When the evidence room is broken into and significant cash goes missing, the team looks into a connection to a recent case. Also, Lala opens up to Gibbs, and Kowalski struggles to move forward.

The team works the case of an investment advisor found dead shortly after her release from prison. Also, Mary Jo is left reeling by an unexpected development in her personal life.

After the shocking developments in the Sandman case, the team works with the FBI to investigate further; while Wheeler struggles to hold onto his job, his family reaches a crisis point.