Lucy and Viv try to replace the TV antenna on the roof.

Lucy plans to surprise Vivian with a new mattress and a redone room while she's on vacation, but the electric mattress Lucy bought her malfunctions (it moves around the room when the motor is on) and Lucy is forced to return it. However, Vivian returns home early and has no place to sleep, so she and Lucy have to share the boys' bunkbeds for a 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.

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.

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.

Tired of her daughter Chris hogging the bathroom all the time, Lucy asks her neighbor Harry to install an extra shower for her. Not wanting to do the job, he hires a plumber to do it instead. Lucy nags the plumber so much that he quits, leaving Lucy and Vivian to finish the jobs themselves!

Lucy convinces Viv to start selling her caramel popcorn.

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To make money to buy a bike for Jerry, Lucy takes a job as a kangaroo.

Lucy and Viv decide they need an extra room where they can entertain visitors.

The ladies escort a local cub scout troop on a trip to Washington.

Lucy invests in a boat.

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.

After tripping over one of Jerry's toys, Viv decides to sue Lucy.

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.

Lucy tries to convince her siser to have a fancy second wedding.

When the bank accidentally gives Lucy a check for $2,000 instead of $20, Lucy decides to hide the money in a candy box for a few days to give the persnickety banker a good scare.