A plus-sized diet doctor (Jennifer Holliday) hires a hard-body fitness instructor to promote her nutrition program, a man (Dack Rambo) tells his partner he wants to see other women, and Doc runs into an ex on his honeymoon.

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Capt. Stubing decides to get Vicki a parrot for Christmas. Unfortunately, it hasn't been trained to talk, and Gopher and Isaac's efforts to train it prove disastrous. A stowaway convinces the crew that a playboy passenger is his father. A father and son, who haven't spoken for ten years since the younger man left their singing act to go solo, resist their wives' efforts to reunite them.

Famed author Brian Mallory gives three people free tickets to a Caribbean cruise. He then presents each of them--and Gopher--with gold coins. He explains that they are among the last people to have spent time with his nephew; and offers them $100,000 if they can track down the young man, who is believed to be on one of the islands the ship will be visiting. One of the passengers taking part in the quest is about to donate a kidney to his brother. A young woman follows him around and seems to take a special interest in everything he does. Mallory's wife finally grows tired of his aloof and cruel behavior toward her. She leaves him, and seeks comfort with Doc. An old friend asks Capt. Stubing to leave the ship to help him run his business. A jealous woman accuses Julie of trying to steal her fiancé, a man who was a casual acquaintance of Julie's in college.

Julie (Lauren Tewes) has a run-in with a zoologist (Anthony Andrews), who turns out to be a passenger, and they butt heads. A young actress (Alison Arngrim) comes aboard and makes a fool out of Vicki (Jill Whelan). An estranged husband (William Christopher) and wife (Toni Tennille), one of whom is a neat-freak (Christopher) and the other a slob (Tennille), find themselves not only on the ship but in the same cabin

A man organizes a ""marriage-a-thon"" cruise, with special prizes to be given to the couple found to be the most compatible. At the same time, he tries to save his own crumbling marriage. Doc tricks Gopher into taking his place as one of the judges, but comes to regret it when the two attractive female judges constantly try to make time with Gopher. The single parents of one of the engaged couples come aboard with the hopes of breaking up their kids, who they think are too young to be tying the knot. A couple tries to finally get married after ten years together--and nine broken engagements. A groom decides to dump his fiancée, but skips the cruise and leaves his best man to break the news to the bride. The best man is Marv, the young man who befriended Julie when he was best man for another wedding on the Alaska cruise. He cannot bring himself to tell the bride the truth, particularly because he also has feelings for her.

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One-time stowaway April Lopez returns to the ship as a popular singer. However, she grows tired of the hassles of fame and decides that she would like to become a cruise director. Julie tries to show her the ropes, but April ends up creating havoc wherever she goes. A couple brings its four rambunctious children along on its second honeymoon. The woman repeatedly ignores her husband to tend to the children's needs, and April inadvertently creates further problems with their marriage. A buddy of Capt. Stubing's from his military days comes aboard, and is shocked to see the former USO star with whom he once had a romance. Due to a misunderstanding, each believes the other is to blame for cutting off their affair.

Capt. Stubing receives a letter from his daughter, Vicki. When he tries to call her, he learns that she has run away from her aunt and uncle's home. She shows up on the ship and reveals that she has read her mother's diary, and now knows that the captain is her father. She wants to stay with him, but he feels that it is best that he return her. Vicki's aunt reveals that she is getting a divorce and wants to send her children away for a while so that they won't be affected by the proceedings. Capt. Stubing and Vicki are thrilled by the chance to live together on the ship. Julie plays matchmaker for two shy, old-fashioned people who are unaccustomed to the workings of modern romance. A man is annoyed by the presence of the woman who deadlocked the jury for the attempted murder trial on which they both served, leading to a mistrial. They constantly argue about the case.

A man spends beyond his means while trying to lavish his recently hospitalized wife with gifts. Capt. Stubing and Vicki face an interview with a child services worker, who will decide whether the captain can have full custody of his daughter. A newlywed couple has trouble consummating its relationship because the presence of the bride's bodyguards (her family is ""connected"") makes the groom nervous.

Doc's nephew is making a move on his girlfriend. A psychiatrist, who is on vacation is followed by four of his patients. An actor pursues the writer of a soap opera, who rejected for a role on her show.

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A man must pose as a woman to gain passage on the ship so that he can pursue an ex-girlfriend. A bickering married couple gets trapped in the elevator. A detective falls for a married woman whose husband has hired him to trail her.

Gopher quits his job to manage a new hotel; a wealthy eccentric widow books a five-year passage and begins meddling in the crew members' lives; a magician tries to avoid his assistant by sending his brother to perform in his place.

The Pacific Princess transports a wedding party to Alaska for the nuptials of the son of a wealthy heiress and the granddaughter of a fiercely independent oil man. The groom's old friend does her best to ensure that the wedding never happens. The groom's mother tries to hide the truth about her crumbling finances. Her estranged ex-husband shows up uninvited in the hopes of making amends with his son. He befriends Capt. Stubing. The best man tries to make a play for Julie; but she cannot stop thinking about her ex-flame Jack, who lives in Alaska. The bride's grandfather and the groom's wisecracking aunt take a liking to each other, but are reluctant to admit they are in love. Isaac becomes obsessed with learning trivia about Alaska. Gopher tries to hit on the bridesmaids.

Gopher invites his widowed mother onto the ship in the hopes of cheering her up, but is hurt by her seemingly cheerful attitude, which he interprets as an insult to his father. A group of buddies takes a cruise. One of the men meets a woman who is a regular customer at the restaurant where he works. He lies about his identity because he thinks she would be put off by the fact that he is a waiter. A comic's romance with the reporter who is writing a feature about him appears doomed after she takes offense to his act.

Isaac is nervous about the arrival of a famous model, who was his classmate in the first grade. The woman tries to use Isaac to make her sports-obsessed husband jealous. Two sisters overhear Janet pretending to fend off an attack by Isaac, and come to believe that a sex maniac is loose on the ship. Two attorneys must keep their affair a secret because they work for the same firm. He wants to make the relationship public and get married, but she experiences doubts. An older woman undergoes a drastic makeover to shake out of her humdrum life, and encourages her skeptical husband to do the same.

Vicki tries to play matchmaker for Capt. Stubing and Emily, whose husband still plans on winning her back. Gopher lands in a Curacao jail after Doc sends him on a wild goose chase so that he can get cozy with the marriage-a-thon judges. Carl and Mary Ann decide that they were wrong to interfere with their kids' wedding plans; but their new romance drives a wedge between the couple. Mary considers calling it quits with Tom, who is physically unable to say the words ""I do"" because of his subconscious fears about marriage. Emily accuses Marv of treachery after her fiancé suddenly reappears in Curacao and denies that he planned to leave her.

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A desperate 23-year old virgin wants to spend the night with a handsome fellow she meets on board, but in the end decides she will hold off until the time is right; a bratty adopted teenager finds out that the assistant bartender that he has been harassing is actually his long lost older brother; the entire crew chips in to help April get ready to take her U.S. citizenship test despite her severe test anxiety.

(Part 2) The Love Boat sets sail with two famous Hollywood stars, married couple Roz Rogers and Bill Klieg who need to find a balance between their professional and personal lives. An inept team of thieves board the ship and try numerous tactics to steal the Star of Kashmir, an expensive jewel brought aboard the ship by Ms. Rogers. Two childhood friends from a school for the blind meet up on the ship - only one of them isn't blind anymore. But that's not the only secret he is keeping from his friend. A philandering husband looks like he will be found out when he boards the ship with both his wife and his mistress.