Harm goes to Russia to help in reforming Russian military law; however, complications arise. Mac and Bud prosecute a Naval officer for espionage, then she too goes to Moscow. Harriet gets a small surprise, and Harm gets a large one.

Harm is distraught when his newly discovered half-brother, Sergei, is framed for a crime punishable by death, while Mac arrives in Russia to prevent a presidential assassination.

A US frigate rescues and takes aboard a 12-year-old Cuban girl clinging to floating debris; internal and international squabbling ensues. Harm and Bud fly out and lend a hand. The girl takes some big steps. Mac and Mic talk more.

Harm and Bud investigate a crash of an F-14 while it leaves a civilian upgrade facility; they find irregularities. Mic, now a civilian lawyer in Washington, represents the vendor. The admiral tries hard to give Sydney a happy birthday.

A love triangle leads to the death of a teenage girl, and a woman Naval officer goes on trial for murder. On live TV Mac and Bud prosecute, and one of Mac's law professors defends. Harm investigates an apparent suicide aboard a carrier.

A sailor on overseas duty in an Arabic nation falls in love with a local girl; he smuggles her into the USA and marries her. She turns out to be a princess; Mac represents her in an Islamic tribunal in Arlington. Harriet goes into labor and there is trouble.

RAdm. Boone has become nominated to serve as ComSixthFleet and to get his third star. Days before the Senate confirmation hearing, SecNav receives an anonymous hotline tip alleging war crimes in Vietnam by Boone; Harm and Mac investigate.

RAdm. Boone goes on trial for murder of civilians in a village in South Vietnam. Mac and Bud prosecute, and Harm and Loren defend. Webb produces a surprise witness with surprising testimony. Meanwhile RAdm. Chegwidden gets back his SUV.

Bud feels anger and agony over the recent tragedy in his family; he considers courses of action and makes a decision. Mac moves a ring, and Mic prepares to return to Oz. Webb twice gives Harm news. A secret about Harriet comes to light.

Cdr. Kate Pike briefly passes through the JAG headquarters, the SecNav cancels orders for a rear admiral, and Bud represents an attractive woman Marine corporal who wishes to attend Officer Candidate School, but a tattoo gets in the way.

Admiral Chegwidden heads the selection board for captains this year. SecNav tries to get a member of his staff promoted. Meanwhile Harm tries to help a former drill instructor who faces a long prison term under the three-strikes law.

A U.S. frigate collides with a Turkish destroyer in the Aegean partly due to a nearby Greek escort. Chegwidden ordered to prosecute the frigate's CO. Harm and Mac defend him. In DC, Bud's brother has a 19 hour date with Gunny's sister.

A Marine sergeant major, on trial for attempted murder, invokes a supernatural event; Bud prosecutes, and Harm defends. A priest from the Vatican investigates the alleged involvement of a chaplain who died during a firefight in Vietnam.

During night flight ops a sailor falls overboard from a carrier; Harm and Bud investigate, suspect murder, identify a suspect, and prosecute him. Mac defends a Marine for bigamy, which turns into polygamy. The admiral finds another car.

A Russian nuclear submarine sinks while submerged with a US nuclear submarine nearby. The Russian government learns that the fault for the sinking lies with the Russians, but the officials seek to blame the US anyway. The US submarine leaders know what took place, but they feel reluctant to reveal that, because to do so would disclose an important advantage. After two surprising twists Mac takes a ride aboard a US submarine, and Harm takes one aboard a Russian submarine. The two boats wind up near each other, because the US vessel shadows the Russian one. An extremely dangerous situation develops aboard the Russian boat, and Mac and Harm take part in resolving the problem. Meanwhile a woman ensign in the US Navy graduates with honors in nuclear engineering from a college and from the Naval Nuclear-power School; she then applies but is rejected to attend the Naval Submarine School and to serve aboard a submarine; Mac and Bud advise her.

Mic represents a civilian wrongfully jailed in a Navy brig; he settles with Harm and Bud. Gunny goes to New Mexico to pick up a Marine who disappeared after service in the Korean War. The admiral goes fishing and winds up in a firefight.

Terrorists aboard a service boat approach a USN destroyer in a port in the Mideast; a security team stops the boat and finds explosives and a woman Marine sergeant. Harm and Mac investigate. The suspect volunteers for a task for the CIA.

In Mazatlan, Mexico, Mike, Bud's brother, becomes involved in a barroom fight with a local, who later dies. Harm and Bud, with help from Bud Sr., eventually discover the cause. Mac successfully defends a Marine bulldog in a paternity suit.

A Marine sergeant in prison needs Harm's help again when his prints are found on a murder weapon.

Representative Latham and another ride an MV-22 Osprey aircraft; just above the sea a minor mishap occurs. Latham holds an inquiry, and Harm and Mac take part. Harriet investigates an old case of innocence. The guys start planning a party.

LCdr. Jordi Parker, one of Harm's former girlfriends, dies under suspicious circumstances. For a while NCIS regards Harm as a suspect. Mac, Bud, LCdr. Teresa Coulter, and, later, Harm investigate. The admiral helps Danny to make a choice.

RAdm. Chegwidden holds an engagement party for Mac and Mic. Harm and Mac take part in frank and profound communication amid a parade of incisive and revealing flashbacks. Bud runs into some trouble, and Harriet receives a gift of gold.

Sarah dreams about an actual conspiracy to commit a mutiny in 1842 at sea aboard a brig of war, a sailing vessel, of the US Navy.

Harm misses Mac's rehearsal and dinner by doing his semiannual carquals, then he and Skates eject from an F-14 Tomcat at night during a storm at sea. A rescue helo picks up Skates, but Harm remains unfound in the rough sea. [Continued.]