I Love Lucy - Season 5 - Eps 25: Lucy Goes to Monte Carlo
Ricky is working in Monte Carlo, but Fred goofs and negotiates too little money for the engagement. Lucy and Ethel go to the casino to watch, and Lucy finds a chip that someone dropped. She picks it up and puts it on the table. The chip wins, and continues to do so, all by accident. Since Ricky warned Lucy to stay away from the casino, she hides the money in Ethel's trunk. Ricky finds it and thinks Fred has been holding out on him.
About I Love Lucy

Title: I Love Lucy
First Air Date: 1951-10-15
Last Air Date: 1957-05-06
Status: Ended
Rating: 7.9/10 (from 226 votes)
Language: EN
Seasons: 7
Total Episodes: 180
Network: CBS
Genres: Comedy, Family
Production Companies: Desilu Productions
Synopsis
Cuban Bandleader Ricky Ricardo would be happy if his wife Lucy would just be a housewife. Instead she tries constantly to perform at the Tropicana where he works, and make life comically frantic in the apartment building they share with landlords Fred and Ethel Mertz, who also happen to be their best friends.
Cast

Lucille Ball
Lucy Ricardo

Desi Arnaz
Ricky Ricardo

Vivian Vance
Ethel Mertz

William Frawley
Fred Mertz