Passengers who search for romantic nights aboard a beautiful ship travelling to tropical or mysterious countries, decide to pass their vacation aboard the "Love Boat", where Gopher, Dr. Bricker, Isaac, Julie, and Captain Stubing try their best to please them, and sometimes help them fall in love. Things are not always so easy, but in the end, love wins.
Katie is suppose to write a school paper on her family, so she writes about certain situations that Benson, The Governor, Marcy, Pete, and Gretchen Kraus have all been in.
An old widow sells the Dukes a "worthless" vase for $25. A man comes to the widow after the Dukes leave, looking for the vase which turns out to be of some very good value!
J.R.'s plan to sell is cut short by Jock and Ellie's reconciliation. Meanwhile, Jeremy Wendell sets out to get revenge against J.R.
Magnum tries to impress a beautiful 'fan' of Robin's by showing her the Robin Masters estate, only to learn that she is actually a top security expert hired by Robin to test the estate's security.
Henry feels left out when Kip renews his friendship with a rock and roll star.
Fred's successful, but domineering brother, Dave, comes to dinner. Mindy accidentally eats an Orkan dessert which makes her behave strangely. Things get even worse when Uncle Dave eats some of the dessert.
The staff contract a strange tropical illness, Marine's Disease, from Mr. Humphries. They are quarantined in the basement until the disease is past.
Elaine is forced out of her apartment when her building goes co-op and moves into Bobby's place while he's away with a touring stage production. Soon, Bobby returns because he is kicked off the tour for fooling around with the director's daughter, and suddenly, he and Elaine are living together. A few days later, Elaine tells Alex how much she's enjoying living with Bobby, when suddenly she gets a call from her boyfriend, who breaks up with her. Elaine leaves upset, and Alex briefs Bobby to look out because Elaine is vulnerable and may want physical companionship. That night, Elaine wakes up Bobby to talk and drink some wine with her, then Bobby panics that she is coming on to him, and calls Alex. When Alex arrives in his robe and slippers, having run 25 blocks through the snow to get there, Elaine gets upset that they have misinterpreted her actions. The guys are ashamed at their chauvinism and they all make up.
The verdict is in on the Harris/Ripner libel suit, and a woman threatens to blow up the squad room with a homemade bomb. What better time for Detective Fish to drop by for a visit?
Russians are trying to find an heiress and her Russian husband in order to force them to establish a missile cache hold on their private island. Bill needs Ralph's help when he is suspected of failing a lie-detector test at FBI headquarters.
A time traveling detective arrives from the future and enlists Astro and the infamous surgeon, Black Jack, to save the life of a prince from the past.
Chachi discovers a great basketball player who recently transferred to Jefferson High. However, he initially holds back when performing for Roger and, suddenly, changes his mind about being on the team when his father orders him home in the middle of a practice.
Jim and Sir Humphrey pass the buck to protect each other when they appear before a select committee investigating charges of waste in Hacker’s ministry, until Jim’s higher loyalties are called upon.
Hawkeye is overcome by the devotion of a terminally ill G.I., who has leukemia, for his critically wounded buddy, but he has trouble coming to terms with the fact that he can't cure the man. Meanwhile, Father Mulcahy is worried about the impending visit of a Cardinal.
Two archaeologists working in Jordan get more than they bargained for when they decide to smuggle the statue of a mysterious woman over the border to Israel.
When Johnny learns that his first ex-wife is planning to remarry, he is overjoyed at the thought of not having to pay alimony, and celebrates by inviting Bailey to take a trip with him. But he feels less happy about the situation when he meets the obnoxious womanizer his ex-wife is going to marry.