The Girls Night Out
S01E15 - Airdate: 1961-01-06
Runtime: 30 min
Following an argument with their wives over never going out, Fred and Barney decide to take them to an amusement park, which doesn't go over well. As they leave, Fred leaves behind a record that he recorded, which is discovered by a group of teenagers, who fall in love with Fred's singing voice. This leads to Fred becoming a famous singer nicknamed "Hi-Fye" and traveling on a world tour. Fred becomes conceited with the attention while Wilma and Betty get homesick, so they spread an ugly false rumor about "Hi-Fye" that ruins his reputation and ends his career, turning things back to normal.
Episode details and rating from TVmaze.