Hardcastle cuts his fishing trip short when he receives word of the death of his old girlfriend's current husband. After deciding to check up on her, he is shot as he interrupts a burglar at her house, who looks like the deceased husband.

After race car driver Kiki Cutter is injured during a race, Mark, knowing her from his own racing days, decides to pay her a visit. Fortunately for Kiki, Mark arrives just as someone tries to kill her. Although the killer manages to escape, Mark does manage to get his license plate number. Believing that the attempted assassination may be tied into Kiki's crash, Mark sneaks a look at the car. Confirming his suspicions, Mark finds evidence that Kiki's car was sabotaged. Meanwhile, Hardcastle traces the assassin's license plate to Hal Jenkins, an insurance broker. Some of the pieces of the puzzle are tied together when a recovering Kiki reveals that she has been secretly planning on divorcing Sammy "Sidewinder" O'Connell, her race driver husband. Once, Hardcastle has stopped Jake Thomas, the man who tried to kill Kiki, as well as arrested Jenkins, Mark, with some financial backing from the judge, decides to challenge O'Connell in a major car race. Thanks to his superior driving skills, Mark defeats O'Connell and settles a longstanding rivalry between them. Afterwards, O'Connell, who had selfishly acted out of fear of how the divorce would impact his career, is arrested for his part in the attempts on his wife's life.

Hardcastle's neighbors begin a Neighborhood Watch program after a series of local burglaries have them worried. After being overlooked by the organization for the selection of their Captain, the judge forgets about his displeasure when the thieves are caught only to be found dead later from a mysterious virus.

While attending business downtown, Mark rushes to the aid of a woman being attacked by men in a mail truck. While he thinks he can find safety from the police officer reponding to their call, the woman informs him the officer is actually a member of an unofficial "underground" police and they are far from being safe.

Seeking Hardcastle's help on a case of corrupt cops, a young patrolman is killed before he or Hardcastle can seek higher help in the department. With the case dealing with bad cops who could recognize the investigators, McCormick is asked to go undercover to flush out the corrupt cops and find the patrolman's killer.

After investigating the suicide of a comic, Hardcastle relizes that it wasn't really suicide after he and McCormick prevent the attempted kidnapping of the comic's wife.

With the judge's birthday coming up, Mark decides to unofficially help him close a cold case related to a soon-to-be-paroled crimial that Hardcastle put in jail for another crime. Unfortunately, the new trial winds up with Hardcastle being shot and the criminal escaping.

Hardcase's two aunts help out during a nursing home jewelry heist.

Not wanting to continue cleaning up the estate, Mark hires Millie Denton, his former prison cellmate's widow, as a maid. Meanwhile, Hardcastle begins looking into the suspicious death of a lawyer named Charlie Clarkson. Taking over Charlie's practice, Hardcastle interviews Loni Summers, a model that had previously hired Charlie to handle her divorce. Discovering the divorce is now off, Hardcastle checks into the background of actor Dex Falcon, Loni's husband. Investigating, the judge discovers that Falcon had secretly been receiving millions of dollars from an attorney named Wendell Price. In the meantime, Millie, who claims to be a psychic, has a vision of Mark's murder. Ignoring Millie's warning, Mark proceeds with the case. To Mark's regret, he is captured by Price, shot and left for dead. Thanks to Millie, Hardcastle locates Mark in time to save his life. Next, based on the evidence Mark had gathered, Hardcastle and the police, having already taken Falcon into custody, movie in and arrest Price. As the episode ends, Millie, shaken up by her visions, decides to quit and move in with her sister.

Mark is thrilled when he wins $20,000 racing in the Arizona Modified. His joy quickly dissipates when thieves hold him up and steal his winnings as well as the Coyote. Based on Hardcastle and McCormick's description of the thieves, Deputy Sheriff Dan Johnson realizes that they were robbed by locals Arvin Lee and Melissa Kantwell. Complicating matters is the fact that Melissa is the wife of Billy Blackstone, the city's sheriff. After recovering the Coyote from a used car salesman, Hardcastle and McCormick begin to track the crooks. To their surprise, they catch up with Arvin Lee only to discover that he has been murdered. Putting the pieces together, they realize that Blackstone probably killed Arvin Lee. Taking their theory one step further, Hardcastle and McCormick speculate that Melissa only pretended to fall in love with Arvin Lee in order to trick him into stealing for her. With Johnson's help, the judge and Mark locate Blackstone and Melissa. With Blackstone unwilling to surrender, the deputies are forced to shoot and kill him. To Mark's regret, the shoot-out starts a fire that destroys his racing winnings.

Hardcastle is arrested after a woman whom he had prevously had a chance encounter earlier is found dead in his home. Thinking the judge was framed due to his ruling on his latest case, McCormick tries to help his friend get out of jail.

When star of a television court show has to go into the hospital for surgery, he asks Hardcastle to fill in as the show's star. But, his enthusiasm for the show comes to a halt when the station's public relations person is murdered.

In the third season opener, Hardcastle and McCormick go on a photo exhibition with Buzz Bird, one of the judge's old friends. To their regret, Buzz, who is a pilot, has a heart attack while flying them over a stretch of Oregon wilderness. While Hardcastle and McCormick survive the crash landing, they are stranded miles from civilization and unknowingly attract the attention of Taylor Walsh, a mountain "pirate" who has made his living by robbing tourists. After suffering through a horrible rain storm, Hardcastle decides to tell Mark how much he appreciates their friendship. Although Mark pretends to be asleep, he actually hears everything the judge has to say. The next day, the two men come across the dead body of a murdered man. Realizing that they are being tracked, they decide to speed up their journey by white water rafting. Once the two men are in the water, Taylor and his men attack. Fleeing to land, Hardcastle and McCormick manage to evade the pirates. Turning the tables, the two men capture Taylor and his men. A month later, the judge and Mark, with their prisoners in tow, finally return to civilization.

Mark surprises the judge when he not only qualifies for, but becomes a winner on, The 1 Million Dollar Trivia Master, a television game show. Unbeknownst to Mark, veteran game show producers Harry Baxter and Art Healy, envisioning big ratings, decide to help the ex-race car driver along once they discover that the audience is cheering for him to succeed. To guarantee a winning streak, the producers have Hardcastle's estate bugged and begin basing their questions on Mark's home practice sessions. Although Hardcastle quickly realizes that something is amiss, Mark is unwilling to accept that the game is rigged. After Diane Templeton, one of the trivia show's employees, dies under mysterious circumstances, Mark turns around and admits that something is seriously wrong. Searching the show's offices, Hardcastle finds out why Diane was killed: She had obtained a tape proving the show is fixed. Meanwhile, Baxter and Healy discover that Bryce Benson, the shows host, had taken their plan to a deadly conclusion by killing Diane. Not wanting to face murder charges, the producers decide to tell Hardcastle everything. During the taping of the show's final round, Mark, giving up his chance to be a big winner, reluctantly helps the police stop Benson. Hinting at the series eventual conclusion, Mark jokes about going to law school in this episode.

After seeing reputed mobster Stevie Ray kill a man named Tommy Chen, former prostitute Angie Bloom goes into hiding. Before disappearing, she decides to leave Nicky and Lindsey, her young children, with Hardcastle for safekeeping. While the kids initially refuse to tell the judge their name, the judge eventually realizes that they are Angie's children. Meanwhile, Hardcastle and McCormick discover something is amiss when some men unsuccessfully try to kidnap the kids. Following a hunch, Hardcastle pays a visit on a former madam named Dolores. The hunch pays off and the judge locates Angie. Convinced that Hardcastle has her best interests in mind, Angie tells the judge the whole story. Recognizing that the best way to protect Angie is to put Stevie in prison, Hardcastle arranges for her to testify. To his regret, the officers that pick up Angie are actually Stevie's men. Upon learning the truth, Hardcastle and McCormick "convince" one of Stevie's men to tell them where to find Angie. Following up on their lead, the two men capture Stevie and rescue Angie.

Entering the hospital for a routine checkup, Hardcastle discovers that he is dying from an incurable disease. Not wanting to let his friend just fade away, Mark convinces Hardcastle to live his remaining days to the fullest, Taking Mark's advice to heart, the judge, using the money he inherited from his wife, buys a one million dollar boat. Hardcastle's boating career is short lived, however, for armed men steal the boat. Although Hardcastle is initially willing to let the police handle the crime, he changes his mind after discovering that the hospital made a mistake and he is not really dying. Searching the docks, Hardcastle and McCormick locate the boat. Instead of reclaiming his property, Hardcastle discovers that the boat really belongs to an influential Senator. Realizing that Barry Jackson, the man who illegally "sold" him the boat, is a con artist, Hardcastle contacts his bank to find out where his money is being transferred. With Lieutenant Harper's help, Hardcastle and McCormick stake out the bank and capture Jackson. In the process, Hardcastle recovers his money.

When Bill Bauer is declared dead after being MIA from the Marines for 10 years, Mark, the soldier's former best friend, is asked to handle the funeral arrangements. The funeral does have one positive result for it reunites Mark with old friends Patrick Burke, Jeff Steffan and Peter Trigg. To Mark's surprise, shortly after the funeral, Bauer turns up very much alive. Upon being confronted by his angered friend, Bauer explains that he had been in charge of destroying cash when the United States pulled out of Vietnam in 1975. Instead of following orders, however, he had waited for an opportunity to smuggle the money into the country. Continuing, Bauer relays how he used "his" casket as a way of transporting the cash. Bauer realizes that his plan is falling apart when someone tries to kill him. Seeing no alternative, Bauer decides to go after the men chasing him. Following Bauer, Hardcastle and McCormick discover that Peter Trigg, secretly the leader of a group of terrorists, is trying to get a hold of Bauer's money in order to buy weapons. Although Trigg temporarily manages to capture Hardcastle and McCormick, the two men are able to turn the tables thanks to Bauer's intervention. Later, the police are all set to take Bauer into custody when the ex-soldier decides to disappear again.

As the final episode begins, Mark, who has secretly begun attending law school, is offered a paralegal job by Kenneth Malcolm, one of his professors. Meanwhile, Hardcastle, realizing that Mark's parole is up, decides to buy a car repair business, as a surprise gift for his friend. Upon hearing about Mark's job offer, Hardcastle, not wanting to stand in his friend's way, lies and tells his friend that he bought the company for himself. For his first assignment at law firm Malcolm, Hughes and Dewitt, Mark is asked to reclaim the possessions of Elsey, a resident of the Sunset Acres Retirement Home. Arriving at the home, Mark makes the acquaintance of Mimi LeGrand, a retired actress. Immediately liking Mimi, Mark is more than willing to comply when the former actress asks him to open a bank account for her. To Mark's surprise, he discovers that someone has already opened an account in Mimi's name. Concerned, Mark decides to go to Hardcastle for help. Before the two men are able to really learn anything in the case, they end up in jail as a result of a mistake made by Leroy, Hardcastle's assistant at the car company. While awaiting their release, Hardcastle decides to tell his friend the truth about why he bought the company. In response, Mark reveals that he has been going to law school in an attempt to follow in his friend's footsteps. Once released, Hardcastle and McCormick discover evidence that Malcolm and resident home manager Leonard Porter have been killing the residents and stealing their money. (They were able to move the money by secretly creating bank accounts in the seniors' names.) Armed with sufficient evidence, the crime fighting duo stop Malcolm and Porter. Despite the fall of his professor, Mark vows to continue attending law school. After selling the car business, Hardcastle makes a generous bet with Mark: If the ex-race car driver can beat him in a game of basketball, the judge will pay the law school bill. Due in the most part to Hardcastle's generosity, Mark wins the game.

As the series begins, ex-race car driver Mark McCormick accepts a job driving the Coyote X, an experimental car designed by a friend of his named Flip Johnson. Mark loses his job, however, after Flip is killed in a car accident and ownership of the car is granted to industrialist Martin Cody. Eventually, Mark is brought before Hardcastle, who is presiding over his last case, Mark is given a choice: help the judge round-up two hundred men who walked out of the judge's courtroom on technicalities or go back to prison.

In a change of pace episode, Mark begins to believe that Leprechauns are burying gold on the estate. Ignoring Mark's outrageous claims, Hardcastle concentrates on preparing the estate for an upcoming magazine contest. After Benny, Mark's mechanic, is assaulted by a group of men for information about a group of little people, Hardcastle admits that there may be some truth to Mark's Leprechaun story. That night, Mark and Hardcastle set a trap for the "Leprechauns". The trap works and Hardcastle captures the men who have been hanging around his estate. As the judge discovers, however, the little people are not Leprechauns but rather circus performers. Confronting the performers about why they are hiding out, Cluracan, the groups leader, explains that they are fleeing from communist agents that want to return them to their home country as well as Marvin, a circus promoter that had promised their services to Circus Maximus. As for the mysterious gold, Cluracan reveals that it is his family's money. The next day, communist agent Ivan and his men come to the estate disguised as employees of Ladies Garden Monthly, the magazine sponsoring the contest Hardcastle has entered. At the same time, Marvin and his men sneak onto the estate. With the circus performer's help, Hardcastle and McCormick manage to stop the agents as well as Marvin and his men. Later, Mark's continued suspicion that Cluracan's group are secretly Leprechauns seems to be confirmed when a rainbow leads to a mysteriously repaired Coyote.

A group of retired judges decide to take the law into their own hands by delivering their own verdicts to criminals who slipped through the system or were given lesser sentences based on technicalities or lack of evidence.

Hardcastle & McCormick set out to assist a lawyer, who is an old friend of Hardcastle's, convict a mobster who is running stolen property in semi-trucks.

A gang member is remanded into the judge's custody only to stay in the guest house with Mark, while the judge and Mark go after a psychiatrist who has been taping private sessions with clients revealing vital damaging information.

Mark and Hardcastle take a group of misfit kids to a local prison in order to scare them straight; but while they are there, they are taken hostages by prisoners who are frustrated because of the repeated abuse from the guards and the warden.

Hardcastle persuades an old friend, played by Buddy Ebsen, to obtain a role in a movie in which the movie producer is using his films to cover up his drug smuggling operation.

After finding his sister-in-law missing and her apartment ransacked, Hardcastle discovers that she had been secretly following her professor in hopes of earning extra credit in a police procedures course.

Mark attends the funeral of an old friend, only to be surprised later to receive a message from her on his answering machine. After searching for evidence to her supposed "death," Mark and the judge find political reasons may be to blame for her disappearance.

Hardcastle & McCormick go undercover at a computerized dating service in order to find out why wealthy clients are turning up dead.

While driving through Arizona on his way home from Las Vegas, Mark is surprised to hear the voice of Nick Damion, a rock deejay he idolized in his youth, on local radio station KKSB. Back in California, Hardcastle is working on a dedication for the Pioneers of Music Hall of Fame Museum. Hearing that the Museum needs a master of ceremonies, Mark suggests Nick Damion. Returning to Arizona, Hardcastle and McCormick try to learn something from Jeannine Alexander, KKSB's manager. After helping Damion, who has been using the alias of Joe Cross, out of a fake drug charge, Mark convinces the deejay to return with him to California. Trying to find out why someone tried to frame Damion (as well as why the deejay originally went into hiding), Hardcastle begins to investigate Kello Records, a company that had received a great deal of air time in the deejay's old radio show. At the same time, Damion, who had gone into hiding after discovering that music executive Joe Kello had killed a singer named Danny Phillips to cover up a payola scheme, realizes that he needs to go public with the story. Hardcastle's investigation proves partially unnecessary for the case is resolved when Damion publicly accuses Kello at the Museum dedication. Afterwards, Damion is shocked to discover that Hardcastle has uncovered proof that Jeannine is working with Kello. As the series' penultimate episode ends, Damion gets a new deejay job at a Los Angeles station.

Hardcastle & McCormick travel to Rio to track down a drug runner.

Innocently given a friendly kiss by a woman named Aleeya "Ali" Casir, Mark unwittingly falls into the middle of a major international incident: Assuming that Mark is the American his daughter has been living with, Sheik Abdullah Casir, Ali's father and the leader of an oil rich mid-eastern country, decides to take whatever steps are necessary to protect his son's honor. As a result, Casir orders his Americanized daughter to marry Mark. Meanwhile, Hassan and Rabin, Casir's sons, begin to set up a drug dealing operation. Hoping to maintain friendly relations with Casir, the State department approaches Mark and "requests" that he marry Ali. Although Hardcastle tries to explain to Casir that Biff Anderson, Ali's real boyfriend, would be more than willing to take Mark's place, Casir, having already made an official announcement, is unwilling to change his plans. Forced to follow through with the wedding, Hardcastle, having learned about Casir's drug dealing sons, decides to use the ceremony as an opportunity to expose Hassan and Rabin. Confronted with his sons' guilt, an angered Casir vows to spare himself grief by staying out of his children's lives. As such, the wedding is canceled. Later, Mark is amused to hear that Ali has left Biff to marry a 35 year old television executive.

A convict who has been having an affair with the warden's wife, escapes with her help. He then calls Hardcastle, which agitates him. He and McCormick go out to find him. Eventually, it's revealed that before Hardcastle chose McCormick, he gave this guy a try—and he proved Hardcastle wrong.

Boxer Kid Calico is told to throw a fight in order to keep his kidnapped father alive.

A critically-wounded criminal admits to being paid to frame a former baseball player, Duke McGuire, for murder. Feeling responsible for his false incarceration since he was the presiding judge, Hardcastle tries to help McGuire become a baseball player once again. But his attempt at a comeback is threatened when drugs are found in his locker.

Cleaning out his shed, Hardcastle comes across an old trophy belonging to Teddy Hendrix, his college roommate. Deciding to visit Teddy, who is now a basketball coach, Hardcastle walks into an attempted kidnapping. Since Teddy flees the scene before he has a chance to confront him, the judge visits his old friend's wife. Thanks to Fran Hendrix, Hardcastle discovers that Teddy has been having a disagreement with a man named Roy Barlow. Realizing that his best chance of solving his problems lays with the judge, Teddy decides to tell Hardcastle about how he has been fixing basketball games. Agreeing to help his friend come clean, Hardcastle arranges a meeting between Teddy and the district attorney's office. Before Teddy can testify, Fran, who has secretly joined forces with Barlow, lures her husband into a trap. Meanwhile, Fran also helps Barlow capture Hardcastle. Thanks to Mark and their old basketball team buddies, Hardcastle and Teddy are rescued. Additionally, Mark and the former team members capture Fran and Barlow.

Mark is thrilled when he gets a shot at racing in big leagues—only to learn that his sponsor's auto parts business gets their inventory from stolen cars.

Questioning his maturity, Mark decides to trade in the Coyote for a more conservative car. To his surprise, his credit application is rejected due to an $18,000 default. Investigating, Mark discovers that his name was used in a real estate deal put together by Melinda Marshall, the girlfriend that had helped put him in prison. (As revealed in a flashback sequence, Mark, having foolishly placed his car in Melinda's name for insurance purposes, was arrested for stealing his own car.) Hoping to clear his credit record, Mark pays a visit on Melinda. Confronted by Mark, Melinda reveals that she had faked the real estate contract in order to win a car. When someone tries to steal the car Melinda won, Hardcastle realizes that there is something more going on than a simple real estate deal. Hearing that Melinda works for Ted Rubin, a man in his files, Hardcastle realizes that the real estate company is running a land fraud scram. Realizing that there is probably something hidden in Melinda's car, Hardcastle and McCormick conduct a search. As a result, they discover valuable stamps in the car and learn how Rubin has been transferring his money. Although Rubin arrives at the estate ready for a fight, he is captured thanks to the timely intervention of the FBI agents that had been investigating him. [During this episode, both Mark and Hardcastle have extremely subjective recollections of Mark's original trial.

Hardcastle is quite upset when he is criticized in “Without Sin,” the autobiography of retired mobster Joseph Cadillac. Figuring that the mob, also the subject of Cadillac's criticism, will be angered as well, Hardcastle has Mark follow the author. Later, Hardcastle is surprised when Cadillac comes to him for help.

Hardcastle is up for a spot on the Supreme Court bench but some people don't want him to be chosen.

See Part One