Wanting to spend more time with her daughter, Lucy & Chris go roller skating. But when Lucy gets home, she can't get the skates off because her feet had swollen, and she has to wear them to a dance that night.

When Lucy and Viv break the ceramic cat Mr. Mooney plans to give his wife as a surprise birthday present, Lucy winds up pretending to be a mechanical man in a department store window to steal another ceramic cat.

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Lucy is set up on a date with Dean Martin's stunt double. When the double can't make it, Dean himself substitutes on the date. During the date Lucy keeps telling him how bad it is that Dean Martin is stealing all of his glory.

Lucy follows Mr. Mooney into the bank vault and then closes the door for privacy, causing them to be locked in until the next morning.

Sherman leaves the water in the bathtub running and it runs over, making the plaster in the ceiling below collapse. Mr. Mooney convinces Lucy that it's Viv's fault and they threaten to throw Viv out if she doesn't pay for the damages. They take out their lease and in it, it says that the rent will be considered down payment for the house, after five years, if the tenant desires. Viv has Mr. Mooney and Lucy thinking that she will and they end up trying to steal it from her, while she's sleeping.

While trying to sell Mr. Mooney a vacuum cleaner, Lucy accidentally vacuums up a stamp Mr. Mooney had just bought for $3,000. When the stamp winds up on an envelope sent through the mail, Lucy breaks into the post office to get it back.

Lucy advertises for a roommate to help with the expenses, and after reading the correspondence, she finally decides on Carol Bradford (Carol Burnet), a frumpy off-kilter librarian. Carol soon starts taking over, reorganizing the apartment, laughing like a hyena, and generally driving Lucy nuts. Lucy and Mary Jane scheme to help Carol develop a social life (to keep her out of Lucy's hair), so they have a small party to introduce her to some boys. It isn't long before usually mild-mannered Carol begins drinking, singing, and being the life of the party.

Lucy tries to wangle money out of Mr. Mooney to redecorate, but can only manage enough to do a few things herself. Things are going good until she decides to use fabric paint on her sofa and the sprayer malfunctions.

Lucy needs Mr. Mooney to give her some money to buy Chris a dress for a dance, but Mr. Mooney is in the hospital with a broken leg. Lucy is a hospital helper and on the next day she has work, she tries to get Mr. Mooney to sign the check. She gets kicked off the floor Mr. Mooney is staying on and dresses as a doctor to get into his room.

When Vivian makes some comments about Lucy's baking ability, Lucy enters a baking contest to prove her otherwise. Lucy then swaps hers and Vivian's entries in the contest, which leads to a food fight!

Mr. Mooney approves of Lucy hiring a plumber to fix her kitchen, and the one who shows up looks exactly like Jack Benny (and his assistant bears resemblance to Bob Hope).

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Lucy wins a contest to be disc jockey for a day, and proceeds to wreak typical, Lucy-style havoc in the radio studio.

One of the kids needs money for a birthday party they're going to, but Lucy and Viv don't have it. To solve they're money problem they start up a birthday party, throwing business. At their fist party, everything bad that could happen, happens.

Mr. Mooney hires Lucy to give a new toaster to anyone who opens a savings account. Lucy tries to drum up business by getting her friends to close out their savings accounts and then redeposit the money as new accounts, leading to a rumor that the bank is failing!

Lucy & Mr. Mooney believes in the Bank Robbery by Crooks to ""Stick 'em UP!"" Lucy will attacks the crooks before they steal the assets of the bank and that makes a heroine.

Lucy and Viv argue about how best to spend Christmas together.

Lucy accidentally locks Mr. Mooney in the bank vault and finds a ""can opener"" turned candy store owner to open the vault. Once he opens the vault, he goes back to his old ways and steals several bags full of money and locks Viv and Lucy in his candy shop.

Lucy goes to her college reunion. While she's there, she helps Chris and some of her friends steal the bell tower statue. She and Viv end up having to put it back or suffer the consiquences. They get locked on the top of the tower, until the dean discovers them.

Chris decides to go steady with a boy who turns out to be Mr. Mooney's son. Lucy and Mr. Mooney don't like it and team up to show the kids a lesson by teaching them the real responsiblities of a serious relationship. And then the two adults must camp out in a treehouse to make sure the two don't elope.

When Lucy happens upon Ethel Merman at the bank, then Ethel and Mr. Mooney must make up a fake name and tell Lucy that she only looks like Ethel Merman. Soon after, Lucy is in need of money, as usual, and decides to let this Ethel Merman look alike rent a room. Soon after Lucy is giving her lessons how to perform and sing like Ethel Merman.

Lucy is participated in Winter Sports in Skiing, Ice Hockey, Curling & Ice Skating. Vivian coached her to do it when a true athlete to please help out in the forthcoming Olympics. She can win a decathlon for the bank.

Lucy got a hit on the head and can't remember everything. Viv escorts her to the doctor for help out the symptom. After all the forgetfulness... Lucy's Memory is Restored.

When Lucy's new job as a meter maid goes to her head, she accuses Viv of many violations and takes her to traffic court.