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Emotionally shaken, McGee deals with the aftermath.The murder of a port authority officer reveals Parsa's possible whereabouts; Bishop discloses her past association with the elusive terrorist.After finding faulty bulletproof vests in a cache of stolen USMC gear, the team tries to locate the source and any vests already shipped to soldiers.When DiNozzo is investigated in the death of a man impersonating an officer, the one eyewitness is DiNozzo's dad, who is in town to disclose a secret.When a bomb blows before a military charity concert, the team must determine if the target was a washed-up rocker or if a larger scheme was in play.When the body of a New Orleans politician and ex-NCIS agent washes ashore, the two field offices unite to uncover the motive and reveal the killer.Gibbs and Special Agent Pride chase leads in New Orleans after evidence points to a copycat serial killer; Bishop sends DiNozzo a special souvenir.After returning to the Department of Defense, McGee's girlfriend finds a break in a controversial case; DiNozzo advises McGee about his love life.The team must ascertain if an officer's murder was the result of a bar fight or because he knew too much; DiNozzo and McGee start a juice cleanse.The team investigates the disappearance of a photographer who was scheduled to testify at an Army court-martial hearing.DiNozzo is given an assignment to bring an admiral's daughter home from France, but he turns to the team when he enters a controversial crime scene.NCIS investigates a fire on a ship that served as a secret detention site for terrorists; Gibbs returns to his childhood home after his father dies.In Season 12, Gibbs and McGee travel to Russia to retrieve a computer expert and get into an ongoing battle with mercenary Sergei Mishnev.When Gibbs and McGee's mission overseas is compromised, the NCIS team races to locate them before a Russian mercenary group can do the same.The NCIS team must determine if Washington's latest murder was connected to a mugging or to a private meeting with the president.Ducky returns home to London after an NCIS case reveals a connection to his estranged childhood best friend.After a gifted naval research scientist is murdered, the NCIS team is assigned to a joint terrorism task force by the secretary of the Navy.When NCIS investigates a man overboard, they find Gibbs trapped on a ship that has been commandeered by pirates.The NCIS team investigates the murder of the wife of a Navy commander who recently appeared on a jihadist target list.Gibbs takes a case to heart when the NCIS team exposes a fraudulent charity that preys on the families and friends of missing military personnel.Gibbs tries to help a corpsman who was arrested after providing unlicensed, yet necessary, medical care at the scene of a hit-and-run accident.Surrounded by Thanksgiving travelers at the airport, Bishop and her husband work with DiNozzo on a case involving an elevated terrorist threat.A week before Christmas, Washington faces a citywide Internet shutdown, which leaves the NCIS team to consult with three imprisoned cyberterrorists.While Gibbs navigates between two ex-wives relentlessly vying for his attention, the team investigates copycat crime scenes.The NCIS team searches for a home-grown terrorist after evidence reveals his role in the capture of a social worker in Syria.When the first openly gay serviceman who was set to receive the Congressional Medal of Honor is murdered, NCIS investigates a possible hate crime.The NCIS team investigates the murder of a U.S. Marine who attended the same military academy as Dinozzo.The lead suspect in the team's current case is Gibbs's archnemesis, but he leaves the investigation to his team in order to help a grieving Fornell.A police department homicide case is transferred to NCIS when the victim's stolen identity matches one created for Gibbs two decades earlier.With his knowledge of and contacts in the world of black-market art, Dinozzo Sr. assists the NCIS team on a murder case.McGee and the NCIS team partner with Delilah and the Department of Defense when a murder case includes a clue to a terror group in Dubai.NCIS connects the murder of a petty officer to a 40-year-old cold case, the bombing of a U.S. airport.DiNozzo partners with his girlfriend, Zoe, on a case after evidence calls for a joint investigation between NCIS and ATF.After a U.S. Marine is killed, the NCIS team links the case to a terror group in Afghanistan, prompting Gibbs and Bishop to travel overseas.The NCIS cyber operations division sends special agent Ned Dorneget to assist the team in the murder case of a Navy warfare engineer.The NCIS cyber case continues after the team uncovers a group that's recruiting children to carry out acts of terrorism on a global scale.Following a deadly bombing overseas, NCIS works with several agencies to track a global terrorist group that's recruiting teens via the Internet.Gibbs undergoes physical and emotional changes as he returns to NCIS.