Richard Burton, the movie star, escapes riotous fans by wearing a plumber's disguise. Lucy Carter mistakes him for a much needed plumber. Sam (Burton), the plumber, escapes to the Carter household. Lucy later finds a remarkable diamond ring in his discarded over-alls. By the time Lucy discovers it is THE famous Elizabeth Taylor diamond ring, it is already stuck on her finger. The end result is a creshendo of comedy as Liz feverishly tries to get the ring off Lucy's finger. Ultimately, Lucy's arms are used as Liz Taylor's while Richard & Liz do a scheduled press conference.

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Lucy and Kim attend a Donny Osmond concert with cousin Patricia (Eve Plumb), who is crazy for the 14 year old singer. Donny, spots Kim in the audience, and he falls in love at first sight. Kim believes the flowers and letters are for Patricia, but soon discovers the mix-up. Realizing Donny volunteered to perform at Kim's Charity function because of the mix-up, Kim feels obligated to set the record straight.

Lucille and Uncle Harry attend a Ginger Rogers film festival. Ms. Rogers attends in disguise, and is seated next to ""you-know-who"". When Lucille offends Ms. Rogers, she leaves the theater, but also leaves her purse. Discovering the true identity to the stranger, Harry & Lucy plot to return the purse to meet her again.

Kim has decided it is time for her to move out of the house, but Lucy becomes an annoying mother hen. Ultimately, Kim plans to teach Mother a lesson.

When Lucy buys Craig a record player for his birthday it ends up not working right, so Lucy brings it back to the store but they won't accept it back which causes Lucy and other victims of the companies defective products to present their case in front of shareholders.

Harry sends Lucy to Jack Benny's house where she writes down his biography. Important and significant events throughout his life like him as a child practicing violin to being in the navy to shows with Gracie Allen.

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Lucy tricks Harry into sending her to be Petula Clark's ""Girl Friday"" to assist with a recording session. Lucy's over protection of pregnant Clark nearly wrecks the entire session, but ends by becoming the new gimmick for her record, a human ""waa waa petal"".

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Lucy is chosen on an audience participation game show. The host offers her $500 if she won't lose her temper for a week. When she's escorted off the stage, the host then brings out Harry & the kids, offering them $500 if they can make Lucy lose her temper! They do everything possible to make Lucy lose, but she overcomes temptation. Lucy manages to demolish a grocery store! The week passed. Lucy's back on the game show where the host awards her $500. But then, the manager of the grocery store enters & charges her $499.99 in damages, leaving her with 1 penny! Lucy gets mad & cries until the host reveals that her friends/family were in this charade & award her another $500!

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Lucy convinces Flip Wilson to play the part of Prissy in a local production of Gone With the Wind, with Harry as Rhett Butler, Lucy as Scarlett O'Hara, and Kim as Melanie.

Lucy has a new boyfriend, but Kim and Uncle Harry are worried. The milkman doesn't help matters when he informs the pair the Lucy's boyfriend is a playboy.

Lucy goes undercover again, this time to prison. Lucy attempts to get needed information from a cell mate, but has little luck until Lucy fills her with alcohol.

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Lucy ends up hitting Sammy Davis Jr. while opening the door to the employment agency and it hits his nose which causes him to threaten to sue Harry and Lucy if his nose looks different for the movie he is filming.

Uncle Harry's ex-flame Donna is coming to town, and Harry begins to worry about his appearance.

Lucy encounters Dinah Shore while on a ski trip. The two get stuck together on a ski lift, where Lucy proceeds to sing a medley of Dinah's hits to her, and otherwise annoy the singer.

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Lucy hires detective Joe Mannix.