David Cassidy - Man Undercover (TV series 1978-1979)

Officer Dan Shay was a married policeman in his twenties with the Los Angeles Police Department. Since he looked much younger than his age, he was very useful in undercover situations. He often posed as a student or a naive young man on the wrong side of the law. Keeping his head together at home was his cute wife Joanne and young daughter Cindy, while Sgt. Abrams was his firm police superior. - IMDb