Desperate to be in Ricky's new television commercial, Lucy makes every attempt to get her way; which eventually pays off. But her one-and-only chance flops when she is forced to test the sponsor's product over-and-over, a vitamin syrup called Vitametavegimin, which is 25% alcohol.

Lucy arrives in Hollywood with stars in her eyes. She heads for The Brown Derby, a celebrity hangout, where she encounters Eve Arden and William Holden -- and inadvertently presents Holden with a custard pie in the face. Hollywood legends William Holden and Eve Arden guest-star as themselves.

Ricky wants Lucy to try working for a week, so she and Ethel get jobs at a candy factory, where they are totally inept-especially at wrapping chocolates-due to a speeding conveyor belt that has them stuffing chocolates in their mouths, blouses, and hats.

Lucy gets mixed up with a jewel thief on a cross-country rail trip that marks the end of the series' Hollywood sojourn. That's not the only reason it's a bumpy ride. Another is that Lucy keeps pulling the emergency-brake cord.

En route to Rome by train, Lucy is spotted by a famous Italian cinema director and chosen to play a part in his new movie "Bitter Grapes." Lucy sets out to immerse herself in the role. When she nonchalantly wanders into a vineyard inhabited by a motley assortment of Italian-speaking women, she is dispatched to the wine-making area to crush grapes with her feet.

Lucy promised Carolyn Appleby she'd produce some real Hollywood celebrities. Now she's got to deliver. Dressing up as Clark Gable, Gary Cooper and other celebrities, she manages to fool the near-sighted Carolyn. However, the real Harpo Marx shows up only to discover Lucy dressed up as him.

Lucy is spotted while attempting to "collect" a cement block with John Wayne's footprints from Grauman's Chinese Theater. To avoid publicity and keep Lucy out of jail, Ricky enlists John Wayne's help in replacing the block. One mishap leads to another, and the plot thickens -- as does the cement. John Wayne guest-stars.

Where's the beef? It's in Lucy and Ethel's new walk-in freezer (according to Lucy, the "human popsicle"). Of course, Ricky and Fred have a beef with their wives, because they paid $483 for it. The meat company won't take it back, and they can't sell it to customers waiting in the local butcher shop, so they're stuck with it. And speaking of stuck, Lucy gets herself locked in the freezer!

The Ricardos and Mertzes need to return to the U.S. by plane instead of ship. The 60-pound-per-person baggage limit taxes Lucy's ingenuity: she has bought lots of clothes and souvenirs, including a 30-pound cheese. She boards the plane wearing all the clothes at once and carrying the cheese as a "baby."

Lucy is delighted to learn she is pregnant-but how to tell Ricky? At lunch, he's too preoccupied with work to listen to her, then it's off to the club-where Lucy finds the right moment and just the right way to tell him.

The Ricardos and Mertzes have a hard time finding accommodations that will please everyone on their trip to California. They finally hit a greasy restaurant where stale cheese sandwiches cost them a dollar apiece. Hoping to find something better elsewhere, Ricky pays the check. The couples leave -- only to return several hours later, fooled by some purposely misleading road signs.

Ricky and the Mertzes bet Lucy that she can't go twenty-four hours without telling a lie. The outcome? Lucy insults all her friends and has to admit her real age, weight, and hair color. But she nearly gets a part on a TV show, by telling the truth, more or less.

The Ricardos and the Mertzes stop at Ethel's hometown: Albuquerque, New Mexico (Vivian Vance's real-life hometown). Under the impression that Ethel has been called to Hollywood and not Ricky, the townsfolk accord her a monumental ovation. When Ethel refuses to disillusion them -- and even goes so far as to put on a "celebrity act" -- Lucy takes matters into her own hands.

Fred's fear of becoming seasick threatens the Mertzes and Ricardos' plans for Ricky's European band tour. To prove that Fred won't get seasick, Ricky takes him down to the ship, which is anchored in the harbor. But Fred turns green and becomes more firm about his not going. Lucy and Ethel test some new, improved seasickness remedies on the Staten Island Ferry. The trial run leads to unexpected complications when Lucy gets seasick.

Equipped with an English-French dictionary, Lucy sets out to see Paris and "discover" an artist whose paintings will become very valuable -- she knows she has "the eye." Lucy's first encounter is indeed with an artist -- a con artist who changes her American money for French. Lucy's adventures land Lucy, Ethel, and Fred in jail.

Lucy decides to go on a hunger strike until Ricky agrees to buy her a designer dress. The plan works perfectly (even though Ethel has been smuggling food to Lucy) and Ricky finally gives in and buys her an expensive outfit. But when Ricky discovers what Lucy has been up to, he puts together a crazy outfit made of burlap and passes it off as a Paris original.

When Stevie Appleby, Caroline's son, has a birthday party the same day as Little Ricky's, Lucy looks for unusual entertainment to lure the children. Ricky remembers that Superman is in town, and he invites him. But when Ricky is unable to corral Superman, Lucy is left with no choice but to dress as the Man of Steel herself. George Reeves makes a special guest-star appearance in this episode.

Lucy has a problem deciding what to do to get her vacationing husband, Ricky, out of her hair so she can do her housework. She and Ethel solve the problem by putting their husbands to work building a barbecue.

Ricky and the Mertzes rehearse for pregnant Lucy's trip to the hospital. It turns out to be predictably chaotic, but Lucy does deliver Little Ricky.

With Ricky and Fred glued to a TV fight, their wives go to the local cafe, where service is so slow that Lucy makes change for herself at the cash register and the girls are arrested. They finally prove their innocence and get home to husbands who didn't know they were gone.

Ricky makes the mistake of teaching Lucy to drive his brand new car. It's only after showing Ethel how the car works that she crashes into another car and has to get them unhooked and fixed in time.

The Ricardos and Mertzes head for California. But first, of coures, there are complications. The chief one: Lucy's mother, who shows up and wants to accompany them. Ricky objects (to put it mildly), and when Fred and Ethel overhear him complaining about too many people on the trip, they take it personally. And when the dust from that blowup finally settles, there's packing to do.

With only a week left in Hollywood, Lucy weeps about her lack of souvenirs. Her collection already includes a tin can run over by Cary Grant's rear tire, a napkin boasting Lana Turner's lip-prints, and a few other goodies. But when Lucy discovers that John Wayne's concrete block at Grauman's Chinese Theatre is loose, she decides to take home a souvenir to end all souvenirs.

Ricky, Ethel, and Fred are aboard their ship to Europe when Lucy rushes down the gangplank for one last goodbye to Little Ricky, who will be in Lucy's mother's care while she is in Europe. The ship heads out to sea, leaving Lucy frantically trying to catch up with it.

When Lucy misplaces two train tickets to Florida, she and Ethel consult the classified section, hoping to share a ride with someone driving south. They team up with a peculiar middle-aged woman, Mrs. Grundy, who's bent on getting to Florida in record time.