Harm and Mac face off on opposite sides of the courtroom at the trial of a Navy Seal accused of murdering his closest friend during a mission against terrorists.

Despite evidence to the contrary and the accused's unwillingness to cooperate, Mac, who is defending him, feels there's more to the story than meets the eye. Her fervor causes Harm, who is prosecuting the case, to dig deeper into the dead boy's personal life. It is Harm who discovers that it isn't a case of murder -- but, in fact, the victim begged his friend to kill him in order to keep a secret from his father, a strict former Navy petty officer.

Harm and Mac investigate a female fighter pilot's charge of sexual harassment against her commanding officer.

The pilot, Lt. Marilyn Isaaks, claims to have been grounded for pressing charges of sexual harassment against her commanding officer, Capt. Boone (guest star Terry O'Quinn). Capt. Boone claims he grounded her because she's a bad pilot. While Harm and Mac are called in to conduct a thorough investigation into the allegations, congressional intervention forces Boone to schedule Isaaks for a training flight -- an action that Harm feels will have deadly consequences.

Harm is assigned to escort a rambunctious and ravishing Romanian princess, whose life has been threatened if her father petitions to join NATO. Meanwhile, Bud wrestles with starting a romance with Ens. Harriet Sims.

Harm and Mac defend a former Navy Seal, now a homeless man, but still a highly trained killing machine, who is accused of using excessive force in killing three men who tried to hold up a convenience store.

It seems like an open-and-shut case of triple homicide until Harm and Mac discover that the former Seal, Paul Bauwer acted instinctively at the store as he sought to protect a young boy -- who happened to be his estranged son but didn't recognize him. Bauwer, embarrassed by his own vagrancy, wants to keep his identity a secret from his son. As a result, Harm and Mac must devise a successful defense without divulging their client's relationship to the only witness to the incident, while at the same time proving that Bauwer acted in an appropriate manner.

Harm and Mac find themselves courtroom adversaries when Mac is assigned to defend an admitted wife abuser whom Harm is prosecuting for the murder of his wife's boyfriend.

Mac finds herself detesting the man whom she is supposed to be defending -- a man who reminds her all too well of her abusive father. Meaning well, Harm advises Mac that she's letting her personal feelings get in the way of her professional duties, but the advice enrages Mac and she takes out her anger on Harm as well as her client.

Harm discovers evidence that his father, an MIA from the Vietnam War, may be alive and under KGB control in Russia.

Harm and Mac are investigating the murder of a Navy pilot whose body was found hidden aboard the decommissioned aircraft carrier the USS Hornet. With help from a local police lieutenant, they discover a motive for the crime, which involves a list of MIAs and POWs supposedly still alive and under KGB control in Russia -- and the list includes Harm's father. But before Harm can act on the information, the book mysteriously disappears along with the helpful police lieutenant.

When a fully armed and piloted Navy F-14 disappears during a storm, the JAG team is called in to investigate all possible scenarios, from pilot suicide and terrorism to the curse of the Bermuda Triangle and UFO interference.

When the plane's co-pilot surfaces, bloodied and disoriented, Harm and Mac get some new information that steers them away from Twilight Zone explanations and instead points them in the direction of kidnapping, terrorism and a hard-core militia group's plot to assassinate a PLO delegation heading for Washington by using the pilot -- and his plane -- to do the dirty work.

When Harm, Mac and Bud are ordered to run a routine background check on a Navy SEAL who is a candidate for the Medal of Honor, they uncover unsavory information that may make him unworthy.

Lt. Rivers is up for a medal after he single-handedly rescues the undersecretary of state from fundamentalist terrorists. Harm and Mac, in their investigation, find Rivers, an African-American, to be a very tough, complex and uncommunicative individual who is totally devoted to his country and his duty. But his men paint a different picture of him as a gung-ho loner who doesn't care about the safety of his team and, in fact, botched the mission by leaving one of his men behind. Rivers finally agrees to open up to Harm -- but only if Harm can withstand arduous SEAL training for one day -- including the brutal manhandling required of the ""hostage interrogation.""

Harm's skills as a lawyer are challenged when he defends a female ensign who claims she murdered an officer because her ""instincts"" told her he meant to hurt her.

The ensign claims that when the officer entered her apartment on false pretenses, she felt threatened by him and killed in self-defense. Though the defense is decidedly thin -- no weapon was even found on the man's body -- Mac and Harm decide to stick with the case and are determined to help the ensign remember forgotten details of the event.

Due to frustration at being unable to wrest custody of his son from his drug addicted wife, Corporal Wetzel was distracted during a war game exercise and crashed a tank. Accused of dereliction of duty, Wetzel admits to being diverted on the job, but insists that Mac and Harm must keep him out of jail, since his arrest would certainly mean losing his son.

Harm and Mac like Wetzel and understand that his frustration accounts for his poor judgment. But nobody's more surprised than they when Wetzel winds up in a tank in a stand-off with the military, questioning why he's being forced to choose between being a marine and being a father.

Following her ugly break-up with Dalton Lowne, Mac has reason to believe that he's stalking her -- until he's killed during an apparent car-jacking and the stalking continues. Much to Harm's dismay, the strain of the two events pushes Mac to the edge -- and to the bottle. Concerned for Mac's safety and sobriety, Harm intensifies his search for Mac's tormentor before he causes her bodily harm.

Members of the JAG team encounter resistance from Navajo tribal elders when they insist on DNA testing to verify that human remains are those of heroic Navajo ""code-talker"" Jimmy Blackhorse, who has been missing since World War II. Forensic pathologist Lt. Cmdr. Teresa Coulter joins Harm and Mac on the case.

The Navajo elders consider it a sacrilege to tamper with the remains of the dead and, furthermore, the Navajo medicine woman is certain that the remains do not belong to the esteemed Blackhorse. While the veracity of scientific evidence is argued against that of tribal custom and the metaphysical, Teresa finds herself falling for Harm and putting the entire assignment in jeopardy.

Bud has his hands full when his obnoxious and abusive father, Big Bud, and his younger brother, Mikey, arrive in town for his wedding. Big Bud throws a stag party at a boisterous strip club where Harm's dress whites end up on the body of a stripper. A fight breaks out and Harm, Bud and Chegwidden find themselves in the slammer on the day of the wedding.

While Mac goes downtown to bail them out, Harriet begins to have second thoughts about the imminent nuptials.

Harm and Mac use a party at the Sudanese Embassy as a cover for their investigation of a kidnapping, and they're literally caught by surprise when terrorists take the visiting dignitaries -- and Mac -- hostage.

Meanwhile, Bud notices that Harriet seems to be suffering from more than just flu symptoms.

Harm volunteers to defend a psychotic Vietnam vet accused of aiding the suicide of a fellow V.A. patient. While Harm argues in court that Roscoe Martin withheld the victims medication as a way to free him from the trancelike state in which it left him, the prosecution claims that the lack of medication is exactly what caused the mans death. Disappointed with the direction of the case, Roscoe feels that the cards are stacked against him and engineers an escape from the V.A. facility with three other patients. Their escape takes them to Harms apartment, and a negotiable situation turns deadly when guns are drawn and a SWAT team swoops in to help with what it sees as a hostage situation.

Harm is sent to Washington, D.C., to join a committee formed to judge the validity of a shocking television report -- that U.S. forces used sarin gas on fellow Americans during the Gulf War. What he uncovers, though, is so unexpected that he can't present it without testimony from a key witness, Sgt. Morrison, who was actually on the mission in question in the Gulf, but has been missing ever since.

Meanwhile, Mac is caught off guard when an old flame, Christopher Ragle suddenly reappears in her life.

Mac's ""little sister"" unexpectantly shows up at JAG headquarters, declaring that she's run away from her abusive stepfather. While she investigates whether Chloe has been abused, Mac has her hands full keeping her from turning the office upside down, then learns that her real father is still alive serving on a ship in the Navy. Despite the cost, Mac convinces the Admiral to allow the two to talk to each other via satellite video-conferencing.

Meanwhile, Harm spends the evening interrogating a beautiful Navy doctor arrested for DWI after she lost control of her vehicle on icy roads and ran over a Nativity scene. Harm agrees to defend her when he learns that just before the accident and before she took the breathalyzer test, she had drank some liquid cold medicine (which contains 25% alcohol)

Adm. Chegwidden's attempts to fly to Italy to spend Christmas with his daughter, however, with the Washington, DC area mired in snow, most of the flights out have been cancelled.

When Harm and Mac set out to find C.I.A. Agent Clayton Webb's killer after his body is found aboard a burning ship, they inadvertently uncover a rogue government spy agency.

Retracing Webb's steps, Harm and Mac learn that he was on a top-secret mission to deliver a high-tech weapons project to the proper authorities when he was stopped. Waiting for Harm and Mac when they discover this, though, is none other than Harm's former nemesis, ex-C.I.A. Agent Clark Palmer, now working with the rogue spy agency, who will stop at nothing -- including Harm's murder -- to get his hands on the top-secret project.

When Harm views the body of the severely neglected, abused and abandoned young girl, he unexpectedly becomes emotionally involved and decides to call in the help of Teresa Coulter to help him identify the child and find her killer.

After Teresa performs her own autopsy, she uncovers some clues to the girl's history that lead her, along with Harm and Mac, to the last place the child lived -- as well as to a recently released convicted child molester.

Word of her father's imminent death forces Mac to look back at the years of anger and resentment he caused her. She is furious that a priest is trying to convince her to forgive this abusive alcoholic, who was responsible for her own alcoholism. She comes to realize, however, that perhaps her anger had been misdirected all these years when her mother shows up -- after having abandoned Mac many years earlier.

Meanwhile, Harm takes a gamble and undergoes laser surgery as a possible cure for his night-blindness.

With Harm's eyesight fixed, Harm decides to go ahead and submit a request to be transferred to a fighter squadron. When Lt.Cmdr Parker finds his written request, she is upset at the prospect of Harm being gone for months at a time.

Afterwards, Harm goes over to Mac's apartment who has Chloe spending the night with Mac before she is reunited with her real father. Harm informs Mac of the eye surgery and his plans. Mac is equally upset at the prospect of losing Harm. Mic shows up at Mac's apartment after Harm leaves attempting to court Mac's feelings. After Mic leaves, Chloe tells Mac that Brumby and Harm have a crush on her and begins teasing Mac: ""Harm & Mac, sitting in a tree, k-i-s-s-i-n-g.""

Admiral Chegwidden passes Harm's request to be transferred onto the SecNav. Not willing to do any favors for Harm, the SecNav is reluctant to intervene.

The key eyewitness in an attempted rape trial, a decorated Marine corporal, suddenly goes AWOL after he is asked to testify. Harm and Bud follow his trail, and they begin to uncover disturbing facts about the corporal's past that explain why he needs to stay out of the limelight.

Harm and Mac are sent to Panama to investigate the wife of a Marine officer, Olivia Dunston, suspected of smuggling drugs into the U.S. When faced with the evidence, Olivia feebly denies the allegations, leaving Mac thinking that she's guilty of the charges.

Harm is trapped below deck on a sinking ship with a sailer, who has been accused of murder, and a guard. Some rescue equipment collapses, blocking the only escape route. As water begins to fill the room, the three men are certain that the situation is hopeless.

Trouble in the JAG office starts when Gunnery Sgt. Victor Galindez, ""Gunny,"" is charged with assault following an off-duty altercation outside a gay bar. It comes to light that P.O. Tiner was also involved in the brawl, having come to the aid of his companion, whom Gunny was roughing up.

Meanwhile, Mac finds herself wrestling with the ""don't ask, don't tell"" policy as attitudes toward Tiner change around the office under suspicions that he's gay.

Harm and Chegwidden fight an attempt by a salvage hunter to excavate the remains of a submarine that disappeared in 1941, just before the attack of Pearl Harbor. Meanwhile, Bud takes on the heavy burden of trying to keep an obese petty officer from being discharged for failing to lose weight.

Mac prosecutes a SEAL jumpmaster is charged with causing the drowning death of a trainee during a parachute mishap by being hung over and is defended by Bud, assisted by a new female Lieutenant who is very ambitious, wanting to be the first female JAG.

Bud & Lt. Singer discovers a safety file that is inadmissible in court that supports the prosecution's contention that the jumpmaster was impaired. The file mysteriously winds up in Mac's car and she thumbs through it. After conferring with Harm who tells her what she already knows, she burns the file. But during questioning court, Lt. Singer objects that Mac is basing her argument based on the file, which Bud reluctantly agrees. Mac is charged with prosecutorial misconduct, removed & replaced by Harm.

Having been chewed out by the Admiral, she takes some leave & heads to spend time with Mic in Australia, running into the Admiral & Dr. Walden who are taking their own weekend 'trip'.

Lt. Curtis Rivers (Montel Williams), a Medal of Honor-winning Navy SEAL, is court-martialed for punching a Congressional candidate who falsely claims to be a Navy SEAL. Rivers explains that he is on a crusade to expose Navy SEAL impostors.

In order to prove his point to Harm, who is assigned to defend him, Rivers places him in the center of a dangerous plot to expose another false SEAL. Though Rivers assures Harm that his safety is in the hands of two legitimate former SEALS, he finds himself alone in court when Harm misses the trial to pursue a lead on the would-be assassin.