In Rome, a film producer asks Lucy if she'd be interested in auditioning for his new film entitled "Bitter Grapes." Thinking that the film has something to do with the production of wine, she goes to the only non-automated winery left in the area.
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.