Jesse Wingo, the former famous singer, is spotted by McCormick at a talent contest. But when approached about his past, the contestant reveals his name to be Sam Jones. Puzzled at the similarities, Mark investigates the man only to find that other people are looking for the man named Sam Jones, but want him dead.

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.

Shortly after contacting her friend Mark for help, wrestler Kate Murphy dies during a match. Recognizing that Kate's death was no accident, Mark decides to follow-up on his friend's suspicions that wrestling promoter Marty Torrance is behind the disappearance of a number of young woman. Upon assembling a plan of action, Hardcastle asks friends Lucy and Denise to go undercover as wrestlers. Posing as a wrestling promoter, Hardcastle has Denise, using the alias of "White Lighting" challenge Nancy Mack, one of Marty's wrestlers. Impressed with Denise's ability, Marty agrees to a match and allows Hardcastle's team to train in his gym. Furthermore, Marty, seeing potential in Lucy, asks the "wrestler" out on the date. Although Lucy only goes on the date to get evidence against Marty, the promoter has his own plans. Before Lucy is able to contact the judge, however, Marty prepares to sell her to a white slavery ring. Worried about Lucy, Hardcastle confronts Nancy. Having suffered a falling out with Marty, Nancy comes clean and tells the judge about Marty's plans. Searching the promoter's house, Hardcastle and McCormick come across the location of Marty's meeting with the slavers. Thanks to Mark's driving expertise, Hardcastle arrives at the meeting site in time to rescue Lucy and stop the slavers.

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.

When Mark gets a date with a woman named Debbie Pledger, Hardcastle has to find a new player for poker night. To the judge's regret, Judge Mattie Groves, Lieutenant Frank Harper, and bailiff Charlie Masaryk, the other poker players, arrange to have Assistant District Attorney Freddie "Bummer" Bumgarner, a man Hardcastle despises, join them for the game. Meanwhile, a nearby liquor store is robbed. Needing a place to hide, robbers Tommy Kitchens, Crazy Horse and Joey Britton flee to Hardcastle's estate. Entering the judge's house, the robbers quickly take the poker players hostage. The situation worsens when they discover Frank is a cop and shoot him. Arriving at the main house to get some wine, Mark learns about the hostage situation. With some help from Frank, who was left in one of the bedrooms, Mark prepares a trap for the robbers. Thanks to an uncharacteristic heroic act on Freddie's part, Mark is able to successfully implement his plan and capture Tommy and his men.

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.