NCIS: Origins

In 1991 young Leroy J. Gibbs begins his new assignment in the NIS Department at Camp Pendleton. As a Probie, his first case is working with his future mentor, a young Mike Franks on a sniper investigation.

In 1991 a young Leroy J. Gibbs as a new NIS Agent at Camp Pendleton continues to investigate the case of a sniper with his future mentor young Mike Franks.

A murder 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; 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 death 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.

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; Randy shows Gibbs the ropes of working a protective detail.

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.

The team investigate the death of a famed Marine commander's son. A key part of Frank's family past is revealed.

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

The team investigates the brutal murder of a veteran who fell on hard times after serving in Vietnam, leading Franks to reflect on his own struggles following the war. Gibbs considers a new path 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.

The team investigates the brutal murder of a military sergeant found burned in her car, a case Franks suspects could have a connection to the assault of his estranged wife, Tish.

Vera receives an unexpected call from Bugs, who claims he's ready to answer more questions, after that he has suddenly changed his mind, prompting the team to reconsider the case and race against the clock to try and stop another tragedy.

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.

When the murder of Pedro Hernandez is unearthed, Gibbs faces a reckoning but when he needs his team most, the loyalty of one is brought into question.

Gibbs and Franks investigate the disappearance of a young Marine connected to a mysterious compound with a charismatic leader, and Lala's fate is revealed.

When the body of a college swimmer washes up on the beach, the team must determine if it was an accident or murder. Meanwhile, Gibbs prepares for his first interrogation.

When Dr. Donald 'Ducky' Mallard, a liaison from D.C. headquarters and an old acquaintance of Gibbs, arrives to evaluate whether Pendleton needs an in-house medical examiner, not everyone trusts that's the real reason behind his visit.

The team investigates the robbery of a Navy bank while Franks' brother blows into town desperate for help after hitting rock bottom and Lala, still struggling after her accident, makes a decision about her future.

When a naval officer mysteriously dies, the team travel to the small dust-blown town of Serenity, where they encounter secret-harboring residents, an uncooperative sheriff and an investigation that will reverberate for decades.

When an anonymous tip leads to the body of a young Marine at a horrendous crime scene, Randy believes there may be a connection to a previous case where a coin was left in the victim's throat.

The team investigates the murder of a Marine who had recently been handpicked for a classified mission as Wheeler's personal life is upended, Lala is thrown by unexpected news from Vera, and Gibbs and Diane double-date with Randy and Junie

After Lala's favorite CI is shot, the team works with Oceanside PD to find the culprit. Franks visits his brother Mason at the Range compound. Gibbs and Diane's relationship faces difficulties after she gets a job offer in Los Angeles.

As the team discovers Gibbs' drunken Vegas elopement with Diane, the newlyweds contemplate their future; the team investigates a fatal movie theatre bombing with a connection to the Pruitt compound where Franks' brother Mason is staying...

When a marine captain shows up at Camp Pendleton exhibiting symptoms of a fatal virus, NIS goes on lockdown and Gibbs is forced to take charge. Team races to determine whether it really is a deadly outbreak or something else entirely.

When a lieutenant's water-logged body is discovered with a potential connection to an international smuggling ring, NIS Panama agents are called in to assist, and Gibbs comes face-to-face with an old nemesis: Special Agent Dwayne Pride.

Mary Jo reconnects with an old friend from Atlantic City to investigate two Marines' roadside deaths when the NIS Regional Director attempts to transfer her.

Dr. Tango faces arrest for theft of human remains from a national park. Dr. Donald "Ducky" Mallard comes back to help the team prove he's innocent.

After trusted K-9 agent Gary Callahan is critically injured at a crime scene, NIS hunts for the perpetrator while an unexpected chapter from Franks' past before Pendleton comes to light.

Lala's determination to get Manny out of gang life lands the team in the middle of a turf war.

Gibbs and Lala bond while working a case together. Meanwhile, Gibbs' remote romance with Diane faces new challenges when his father Jackson shows up unexpectedly.

Wheeler takes command when a car bomb goes off outside NIS headquarters. Also, the truth about Franks' distaste for lawyers is revealed.

With the Camp Pendleton office in danger of being shut down, the team confronts an uncertain future.