Widower Doug Simpson (Danza) is a radio producer from California who lives with his two daughters, Katie (Dolenz) and Bonnie (Laura Mooney). When his oldest daughter (Katie) turns 15, she suggests to her father that's it's time for her to start looking more grown-up. For the last 14 years, Katie had been wearing dowdy clothes, braces, and thick glasses and hanging around with Richard, her next-door neighbor and long-time boyfriend (who had won Doug's approval); but when Doug leaves on a business trip, Katie transforms herself, along with the help of Doug's fiancée Janet Pearson (Hicks), into a knockout beauty.