第 9 季 共 24 集
播出时间：2011年9月21日
第 1 集 Nature of the Beast
播出时间：2011年9月21日
Gibbs and the NCIS team have to find answers regarding Tony's months-long assignment when an NCIS agent is found dead.
第 2 集 Restless
播出时间：2011年9月28日
The NCIS team uncovers a startling surprise after a young Marine shows up to his homecoming party with a fatal stab wound.
第 3 集 The Penelope Papers
播出时间：2011年10月5日
The line between McGee's personal and professional life is blurred when NCIS uncovers a connection between his grandmother and the murder of a Navy Lieutenant.
第 4 集 Enemy on the Hill
播出时间：2011年10月12日
The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander.<br />
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Meanwhile, Abby uncovers new information about her family after undergoing tests for a kidney donation.
第 5 集 Safe Harbor
播出时间：2011年10月19日
When a coast guard officer is gunned down on a cargo vessel, the NCIS team searches for the killer, but finds a Lebanese family seeking refuge on American soil.<br />
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Meanwhile, Tony and McGee try and find the perfect woman for Gibbs.
第 6 集 Thirst
播出时间：2011年10月26日
An NCIS case changes from accidental death to murder when evidence reveals that a Navy lieutenant died of forced over-hydration. Meanwhile, Gibbs meets Ducky's new love interest.
第 7 集 Devil's Triangle
播出时间：2011年11月2日
The NCIS team searches for answers when the current husband of both Gibbs's and Fornell's ex-wife is suspiciously kidnapped.
第 8 集 Engaged (1)
播出时间：2011年11月9日
The NCIS team uncovers a discrepancy with DNA remains when investigating the crash of a military plane that had been transporting caskets.
第 9 集 Engaged (2)
播出时间：2011年11月16日
As the NCIS team continues its search for a missing Marine, Gibbs and Ziva travel to her last known whereabouts in Afghanistan. Meanwhile, Tony reveals his deepest fears and Gibbs is forced to relive events from his past.
第 10 集 Sins of the Father
播出时间：2011年11月23日
After Anthony DiNozzo, Sr. is found in a car with a dead body in the trunk and no memory of the previous night, the NCIS team must figure out if he is capable of murder. Meanwhile, Tony is sidelined for this case and must go against orders to try and prove his father’s innocence.
第 11 集 Newborn King
播出时间：2011年12月14日
When a Navy captain is killed in a hotel room, NCIS must track down and protect his very pregnant companion from unknown assailants. Meanwhile, Jimmy has problems of his own when he brings his future father-in-law to work.
第 12 集 Housekeeping
播出时间：2012年1月4日
The investigation into the murder of a Navy Commander leads the NCIS team to E.J. Barrett’s whereabouts.
第 13 集 A Desperate Man
播出时间：2012年1月11日
When a Navy lieutenant commander is found dead in a building under construction, NCIS must search for a killer while dealing with interruptions from her distraught detective husband. Meanwhile, Ray’s return has Ziva thinking about her future.
第 14 集 Life Before His Eyes
播出时间：2012年2月8日
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
第 15 集 Secrets
播出时间：2012年2月15日
When a Navy captain is found dead with an unusual costume hidden under his uniform, NCIS uncovers a secret society of real-life super heroes and must track down the villain.
第 16 集 Psych Out
播出时间：2012年2月22日
Gibbs clashes with Dr. Samantha Ryan (guest star Jamie Lee Curtis) over the truth behind a navy reservist's possible suicide
第 17 集 Need to Know
播出时间：2012年2月29日
Top-secret clearance from a Naval research laboratory is jeopardized when the murder of a Chief Petty Officer is connected to an international arms dealer. Meanwhile, Probationary Agent Ned Dorneget tries to butter up Gibbs in hopes of joining the team.
第 18 集 The Tell
播出时间：2012年3月21日
The Secretary of the Navy partners Gibbs with Dr. Samantha Ryan after top secret information is leaked by someone on the inside.
第 19 集 The Good Son
播出时间：2012年3月28日
A case hits close to home when the lead suspect in the murder of a petty officer is Director Vance's brother-in-law.
第 20 集 The Missionary Position
播出时间：2012年4月11日
Following the murder of a Marine, Tony and Ziva join Ziva’s longtime friend and mentor in Columbia in a search for a missing Marine Lieutenant and Navy Chaplain. Meanwhile, Jimmy Palmer decides who will be his best man.
第 21 集 Rekindled
播出时间：2012年4月18日
After a warehouse fire reveals missing Navy documents, posing a potential threat to national security, the NCIS team joins the Baltimore P.D. investigation, reuniting Tony with a boy from his past.
第 22 集 Playing with Fire
播出时间：2012年5月2日
The NCIS investigation of a fire on a Navy vessel reveals evidence that elevates security at all U.S. Navy facilities worldwide. Meanwhile, DiNozzo and Ziva travel to Italy when an explosive device is found hidden on a Navy ship.
第 23 集 Up in Smoke
播出时间：2012年5月9日
The NCIS team analyzes what secrets could be in the hands of a terrorist targeting the Navy when a high-tech bug is found inside a probationary agent’s tooth. Meanwhile, the festivities for Jimmy Palmer’s upcoming wedding continue with the bachelor party.
第 24 集 Till Death Do Us Part
播出时间：2012年5月16日
Terrorism shakes the foundations of the Navy and NCIS to such an extent that Gibbs and the team face surprises that will devastate them.
