Tony meets Jeanne's father; Tony excuses himself to move his Mustang, which explodes while the gang watch; Ducky says that the victim is not Tony. The Frog meets Jen, but she lets him leave; Gibbs and others pursue him but arrive too late.
The NCIS gang investigate the death of a sailor in a hit-and-run wreck, which turns into a shoot-and-scoot; Ducky finds nearby the body of a young woman who gave birth and died before the wreck. The team figure out the lies and the case.
The Gibbs gang joins Hollis to investigate the death of a Marine captain due to a harpoon through his torso in the study of his home in family housing at Fort Belvoir, Virginia, an Army post. The victim worked under an Army major on an inter-agency task force at the Defense Intelligence Agency (DIA). The NCIS seizes and keeps the victim's laptop computer, but the DIA sends a techie to shadow Abby while she works on it; Abby starts frozen, but she thaws quickly. The team find a network of love interests, including one of Gibbs's exes. Tony and Ziva find a partial print...
While demonstrating an autopsy, Ducky announces murder; Gibbs and company investigate. The victim worked for the FBI, which tried to catch a person who erased old identities and created new ones. The NCIS and the FBI catch the bad guys.
A Navy lieutenant threatens to jump from an 11th-floor ledge in Washington; the Metro PD calls the NCIS; Gibbs and company respond and investigate; Gibbs talks the man out of jumping, then someone shoots him. With help the gang find a mole.
An officer dies aboard a Naval research vessel at sea; the Gibbs team investigates; they find the body but initially nobody else. Ducky announces the cause of death and a gloomy outlook. The gang figure it out and leave in a borrowed boat.
A special friend of Gibbs's daughter asks for help with a Marine sergeant, who has begun stalking her. Gibbs gives him the word, but soon someone abducts the friend and tortures and kills the Marine. Gibbs and Tony solve it and work it out.
While a Navy rear admiral rides in a taxi, two motorcyclists, using silenced pistols, execute both men; Gibbs and company investigate. Ducky says that the target was the driver, who was a political refugee from Burundi. The gang solve it.
While McGee gives his den of Youth Rangers a tour of the NCIS headquarters, one of his boys pops up in a missing-persons database; Gibbs and company investigate. The team find lies, deception, a fugitive, a new murder, and the real killer.
A patient, Damon, a Marine corporal, escapes from a secure lockup psycho ward at the Naval Medical Center, Bethesda, Maryland; he then hijacks a car and kidnaps its owner, who's one of the psychiatrists on his case; Gibbs and company investigate. Damon has received two weeks of treatment for the post-traumatic-stress disorder after returning from Iraq, where he escaped and took his three men with him after killing their captors, who had tortured and questioned them. Abby finds that Damon is on a complex steroid regimen. At a rehab gym Gibbs, Tony, McGee, and Ziva ...
A Marine lance corporal, of Arabic lineage and the Islamic faith, dies two blocks from a mosque in Washington, DC; Gibbs and company investigate. Ducky uses an alternate method; Abby finds a deadly neurotoxin. A tip helps; justice prevails.
Someone has stolen new top-secret radar gear; the NCIS gets a tip about its location. During a stakeout of the site, McGee watches while a man dies; the radar disappears again. The gang and the Metro PD figure it out and catch the bad guy.
While seeking to serve a warrant, the Gibbs gang find cocaine, cash, and the dead body of the subject person; a dog bites McGee, who shoots the dog. Abby goes to bat for the dog, who helps to solve the case. The team nab the bad person.
Fornell and his Hoovers arrive in the squad bay; he tells that the Gibbs team is under investigation for the murder of the Frog. However, the Gibbs gang investigates the FBI, and they put the pieces together and explain them to the suits.
A Marine captain dies in a mortar explosion in Baghdad; the SecNav sends the body to Ducky, who finds that a bullet, not shrapnel, caused the death. Tony and Jardine investigate on site; they and the rest of the team together figure it out.
Ziva, undercover, goes on a date with a suspected serial killer (a Marine); Tony finds the fifth victim; the suspect threatens Ziva, who resists and shoots him with his piece. Gibbs and the team investigate, solve, and find a second killer.
Jen died in a gunfight; Vance and Gibbs meet at the site; Gibbs leaves and meets Franks. Gibbs investigates unofficially; back at the office he suddenly leaves and goes to Jen's home, where he and Franks wrap things up. Vance makes changes.