The Ricardos and Mertzes are on their way to Paris, but first Lucy wants to go to Scotland to seek members of the McGillicuddy family into which she was born. In a classic dream sequence, Ricky appears as Scotty MacTavish MacDougal MacCardo.

Lucy thinks she is a perfect fit for Ricky's Parisian apache dance number. But her dance teacher has more than dancing on his mind.

The Ricardo's neighbor Miss Lewis wants Lucy to deliver a dinner invitation to her grocer. But he misunderstands and thinks the invitation is from Lucy herself.

Fred has a Western-themed show coming up at his lodge and he wants Ricky to perform in it. He can’t — but Lucy and Ethel volunteer (Lucy yodels “Home on the Range”). The reason Ricky can’t appear is that he has a “radio” show that night. Or is it a “rodeo” show?

When Lucy opens Ricky's a telegram ordering him to appear at Fort Dix, she assumes that he has been drafted. Ethel suspects that Fred has been drafted as well when she hears, Fred is joining Ricky.

Lucy spends too much money on a dress. So she tells Ricky that she will get a job babysitting in order to pay for it.

Lucy burns with jealousy when she gets an eyeful of Ricky's dance parter Renita (Lita Baron) from the "old days" in Cuba. She was a child then, but no more! Determined to keep them apart, Lucy heads to the club in disguise, and finds herself in the clutches of a wild man named Ramon.

When no one laughs at her jokes or wants her to be their bridge partner, Lucy comes to the conclusion that she is inferior to everyone else. Worried by Lucy's behavior, Ricky goes to the psychiatrist (or "fizz-a-key-a-tryst" as Ricky pronounces it,) to find the remedy. But it turns out that this doctor's "remedy" isn't exactly what Ricky had in mind.

Even the arrival of the baby hasn't dampened Lucy's showbiz aspirations. Wanting to get into the new Indian act at the Tropicana, Lucy pays off one of the performers and appears herself, carrying Little Ricky papoose-style on her back.

A shy young teenager named Peggy has a major crush on Ricky. Ricky, however, is tired of all this "attention" that this girl is giving him, so asks Lucy to have a talk with her. During their conversation, Lucy asks Peggy to think of some other boys her own age that she might like to go out with instead. Peggy, it seems, also likes a boy named Arthur Morton. Unfortunately, Arthur is painfully shy and cannot dance, so Lucy volunteers to give him a dance lesson. But it is then that Arthur becomes infatuated with Lucy! To get the two off their backs, Lucy and Ricky come up with a solution: they will dress up and act like 90 year olds, and scare their "young fans" back to reality.

Despite her pregnancy, Lucy wants to appear in Ricky's Gay Nineties revue at the Tropicana. After a disastrous audition, Lucy disguises herself and sneaks into the barbershop quartet number, and then proceeds to ruin it.

When Ricky refuses to bring his rumba band out to Westport to play for a Historical Society benefit, Lucy and the Mertzes put together a combo of their own, with Little Ricky on drums.

Ricky lands a TV audition at the club. When Buffo the Clown injures himself and cannot make it, Lucy takes his place.

Ethel wants Ricky to a headline a benefit show for her women's club, but Lucy refuses to ask him, unless she can be on the bill too.

Lucy poses as a princess for a publicity stunt.

Ricky is planning a French revue for the club, and since Lucy is determined to be in it, she hires a Frenchman to coach her. When Ricky forbids her to come near the place, she tries various disguises, and finally succeeds as a chorus girl.

The Ricardos and Mertzes as oil millionaires? Lucy and Ethel get a hot stock tip from their new neighbors from Texas. But Ricky and Fred say no. At first, anyhow. But are these neighbors swindlers? Lucy and the gang eventually think so, so they come up with a plan to find out.

Fred's globetrotting old vaudeville partner, Barney Kurtz, shows up, so Fred says he's a real-estate tycoon (with a red-headed maid to prove it). Actually, Barney's a cook in the Bronx, but his grandson is coming for a visit, so it's on with the show.

Tally ho! In England, Lucy hounds a movie producer (Walter Kingsford) about her riding prowess and ends up on a fox hunt.

Lucy is jealous of one of Ricky's dancer at his nightclub after hearing about a gossip column item linking the two.

Lucy writes a play set in Cuba hoping to cast Ricky, But when he refuses, she has to settle for Fred and changes her setting to England.

Lucy thinks she and Ricky aren't legally married because his name was misspelled on their marriage license. So she wants them to renew their vows at the same place in Connecticut where Ricky first proposed to her. But they run out of gas getting there.

Ricky's laryngitis makes it impossible for him to perform in a big reopening show for the Tropicana. So Lucy substitutes herself, the ex-vaudivillian Mertzes, and a chorus line of middle-aged showgirls from the Flapper Follies of 1927. Look for Barbara Pepper as one of the showgirls.

Lucy thinks Ricky cares more about the baby they're having than about her, especially after he buys her presents like bonnets and rattles. But when he takes her out for a night on the town, she thinks he's lost interest in the baby.

Ricky develops "labor pains" because he is jealous of the attention being lavished on the expectant Lucy. So she decides to throw him a "daddy shower," which Fred turns into a "stag party," which Lucy and Ethel crash.