Lucy fakes an illness to attend a big sale at a department store. When she enters the doors, she finds out she is the 10 millionth customer, winning all sorts of prizes. But all is not wonderful when Mr. Mooney sees her picture in the newspaper the next day.
Lucy is assigned to show Mr. Cheever's nephew Tommy, around the bank and get him acquainted to the business. But along the way she discovers he really wants to be a performer and has a great singing voice. Lucy invites a producer into the bank who unknowingly will be hearing an audition.
A new bank policy requires all employees to be high school graduates. Lucy had never finished with her education and must go back to class.
Jack Benny agrees to move his money to the bank if Lucy can prove that their vault is safer than his.
Chuck Willis, a poor trucker is denied a loan from the bank. Lucy suggests he enters a Robert Goulet look-a-like contest to win some money.
Lucy adds 48 cents to the bank till to even out the books. When Mr. Cheever hears of what is going on he fires Mr. Mooney, feeling he had a part in the cover up. Lucy tries to make Mr. Cheever feel he is going nuts in order to get Mr. Mooney reinstated.
Lucy receives a letter stating that someone is coming for a stay but accidentally tears up the note before reading who sent it. The writer was her health conscience Aunt Agatha, who has strict rules about nutrition and exercise for everyone to follow.
Lucy is injured when she works at the home of Mr. Mooney and plans on suing him for her pain and suffering. She enlists the services of an attorney, a cousin of Mary Jane, named Willy Wiley. Willy is a shyster who sees a fortune to be made in this case and plans on suing Mr. Mooney for all he has.
Lucy attends a flight attendant school and is paired up with Carol Tilford, a woman who is afraid of heights. Trouble ensues on their first flight as the passenger's film breaks. Lucy and decide they can save the day by entertaining the passengers themselves.
Lucy and Carol have earned their flight attendant wings. Meanwhile, Mr. Mooney asks them to team up with Buddy Rodgers and Richard Arlen from the silent film classic Wings, to perform in a stage musical.
Viv returns to nurse Lucy who has broken her leg. But it's Mr. Mooney who looks more like a Florence Nightingale after Viv falls and breaks her leg also.
While at a bank convention, Mr. Mooney encounters dome innocent flirtation with a woman. When she comes to L.A., she insists that he had made promises of marriage to her. Lucy pretends to be Mrs. Mooney to portray how wicked a man he really is.
Lucy and Viv get the wrong idea when they knock on the door of Joan Crawford and see her home empty of any furniture. They believe she has fallen on hard times but do not know she is really having it restored.
There is a forger running around town who looks like Sid Caesar. Sid asks for Lucy's help in catching him while working at the bank.
Lucy campaigns for Mr. Mooney to be named "Boss of the Year" to ensure his chance of getting a job as president of a bank in San Fransisco.