In Miami Beach, Lucy and Ethel make a bet with Ricky and Fred as to who can catch the biggest fish. To ensure winning, the day before the contest, each pair buys a 100 lb. tuna and stores it in ice in the hotel bathtub. Laughter ensues when the guys and the girls switch fish and bathtubs to hide them from one another. They all get caught when they decide to drop the charade and get rid of the fish. The next day they go out on the boat and Lucy's and Ricky's lines get tangled and Ricky goes overboard. Lucy hauls him in with her line.
The Ricardo's and Mertz's visit Cuba to visit Ricky's family. Lucy is told to impress Uncle Alberto because he is the one that wanted Ricky to marry a Cuban woman. Lucy cannot seem to do anything right.
Lucy competes with her friend Carolyn Appleby over invitations and scheduling for Little Ricky's birthday party. When her husband Ricky mentions that Superman star George Reeves is in town, Lucy tries to get Reeves to come to Little Ricky's party, sure that this will make it a much bigger draw than the one Carolyn is hosting. Ricky tries, but Reeves can't make the party. So Lucy disguises herself as Superman, but gets herself into great peril. Fortunately the "real" Superman does show up to save the day.
Ricky is on vacation from work and is always in Lucy's way. Lucy & Ethel decide to start building a BBQ in order to trick Ricky & Fred into taking over a man's job. Unfortunately, Lucy loses her wedding ring during the process.
Lucy organizes a Revolutionary Day Celebration, including a statue dedication. Ricky is going to give the dedication speech. Lucy accidentally breaks the statue and decides to step in with stone makeup to take its place for the ceremony.