At a club dance, Ricky, Fred, and Ralph Ramsey are smitten with Harry and Grace Munson's cousin Diana Jordan, a sultry blonde, much to their wives' collective disgust.
The next day Lucy, Ethel, and Betty Ramsey are discussing the "spectacle." It seems that Ricky danced with Diana nine times, Ralph eight, and Fred thirteen. They all have been invited to a party the Munsons are giving in Diana's honor, but this time the gals are going to doll themselves up so that their husbands will not even notice the Jordan girl.
Lucy will wear her tightest dress, Betty will sport her most exotic perfume, and Ethel will do her hair up like Grace Kelly. Noticing something strange, the husbands decide to play along with their wives that evening.
At the gathering, the guys bend over backward trying to be nice to their wives. Ricky's "strange" behavior prompts Lucy to crack: "When you're this sweet, there's something rotten in Cuba." She gathers up her female cohorts and departs.
Later that night, the husbands confess that Pat Boone-crazy Diana is too young for them, and they return to their understanding wives.
Special Notes: Barbara Eden (Diana) is making her sitcom debut during this episode. She was 22 years old. Eight years later (1965) she would become famous for her role as the title character of I Dream of Jeannie. It is mentioned that Little Ricky is off visiting Stevie Appleby in Manhatten, enjoying the zoo and a Dodger baseball game.
Bloopers: When Fred gets up from the table at the club to go dance with Diana, his chair disappears and reappears between Lucy and Ethel.