This show was a mid-season replacement in January of 1970 (15 episodes), picked up in the fall of 1970 for a complete run thru March 1971 (24 episodes) and picked up again in the fall of 1971 where it ran until December (15 episodes).
During those three seasons ABC had another wholesome entry in the magic sitcom genre (that already included Bewitched and The Flying Nun) this time inspired by the success of Mary Poppins whereas we find a magical nanny (think ESP to the max power) who comes to help a widower raise his children. Whereas shows like Bewitched and I Dream of Jeannie frequently played on the romantic relationship or sexual tension between the two leads (there was even some sexual tension between The Flying Nun's novice nun Sister Bertrille and playboy Carlos Ramirez!), Nanny and the Professor had virtually no character development and the plots began to repeat themselves. Wheras Mary Poppins had a mother in the household the TV show wisely dealt with a father only. While this left the door open for romantic involvement and possible marriage (think Eight Is Enough), this simply was not to be.
Charming as the characters were, they just didn't grow as a family. Bewitched kept interest over the years first by watching the newlywed couple cope with their differences, having their first child, and eventually raising two children.. I Dream of Jeannie moved from sexual tension to engagement to marriage. The big dilemma that was built into Nanny was that the show had two young attractive adults living together under the same roof with young impressionable children. Any sign of sexual tension would have been taboo in 1970 (Jeannie at least lived in a bottle) so they kept the character of Phoebe "Nanny" Figalilly uninterested in Professor Harold Everett and kept a goofy look on the Professor as he got ready with dates uninvolved with the show or his character.
The show eventually played to its only audience that could care less in the social aspects of the plot, young children, when it finished off it's run as a Saturday morning TV cartoon in 1972 (original cast members providing the voices). When shows got canceled in those days that's where they went, funny as it may seem now. From Gilligan's Island to Welcome Back Kotter from Happy Days to Punky Brewster and even TV favorites Mr. T and Gary Coleman animation was the ghostly graveyard of sitcoms.
ESP Note: Juliet Mills wasn't the only actress from this show to play a role where the character has ESP. Six-year-old Kim Richards who played the young Prudence Everett had a long run in television as a child actress but is best known as Tia, the girl with ESP, in Disney's Escape to Witch Mountain (1975) and Return to Witch Mountain (1978). She also played a young woman with ESP in her self-produced film Escape (1990).
