While working on an assignment, Gibbs is seriously injured in an explosion, and taken to a hospital, where he recalls his painful past, which he has always hidden from others. The rest of the team must proceed with the investigation and put their feelings towards Gibbs's injury aside. Tony is left in charge, which may cause a bit of trouble.

The NCIS team must work on an assignment against a terrorist group without Gibbs, who is still recovering from the explosion. Gibbs has to fight with memory loss, while he's visited by his mentor and his former boss. His help is needed, expecially when the team discovers that Gibbs is the only person who has informations about the terrorists' plans, so he needs to retrieve his memory before the terrorists attack.

When Ziva accidentally witnesses a political assassination, she must surrender to the FBI and deal with the consenquences without Gibbs's help, who is now enjoying his retirement. She learns that the FBI is looking for her and escapes, while the NCIS team, leaded by Tony, must prove that Ziva is innocent. However, when things get more complicated, Ziva seeks help from the one person that always trusted her, Gibbs.

After police pull over a driver and arrest him for a concealed weapon, a car crashes into their patrol car with a dead man behind the wheel. The arrested man turns out to be Russian and Homeland Security claim he was working for them. The Russian is linked to an old case that Mike Franks worked on. Mike comes out of retirement to put the Russian behind bars.

When a supposedly frozen to death Marine turns out alive on Ducky's autopsy table, the NCIS team has to find out about the victim's movements last few days to uncover what happened to him and who left him for dead. As the investigation progresses, the team learns about the victim's trip to Baghdad via a private cargo plane and discovers a link to Gibbs' past.

When a former NCIS agent is found dead, the entire team is put in danger as they hunt after the killer.

When one of their own is killed, the team must find the killer before they get to another member of the team, Gibbs. In an emotional investigation, the team tries to stay together, against the wishes of Assistant Director Vance.

Demons of the past come back to haunt Gibbs when he finds a cryptic message waiting for him at a crime scene.

A murder investigation prompts Gibbs and the team to play family counselor to his former mentor, Mike Franks, in the hopes of preventing a bloody international conflict.

Gibbs heads to Mexico to face his demons and make a startling decision.

Gibbs must take desperate measures to protect his loved ones with Paloma Reynosa still on the loose.

After new evidence reveals that the Port-to-Port killer has infiltrated the agency, the NCIS teams chase every lead in a race to track him down.

The lives of NCIS members are in jeopardy when they come face-to-face with the infamous Port-to-Port killer, on the eighth season finale of NCIS.

During a routine stop for his morning coffee, Gibbs finds himself staring down the barrel of a gun, forcing him to question choices he has made in the past and present

Gibbs and McGee travel to Afghanistan when a murder case leads them to an Afghan women’s shelter Mike Frank’s secretly supported for years.

After being shot, Gibbs fights for his life aboard a Navy hospital ship, while DiNozzo and Joanna travel to Shanghai to try and take down the Calling.