•
"Nanny" Phoebe Figalilly (
Juliet Mills), a beautiful young British woman who shows up unannounced at the Everett household to look after the Professor's children. Though she gives no references, Everett affords Phoebe the customary six-week probationary period to see what she can do. At first her antics seem odd to the family, especially Hal, who calls her a "weirdo", but she soon endears herself to the three kids and Everett himself. Phoebe (who prefers to be called "Nanny") claims to be neither clairvoyant nor magical, but appears to have a sixth sense about many things (accented by a tinkling sound whenever her senses assert themselves), including knowing the names of people she has never met, communicating with animals and, most frequently, knowing someone is at the front door or on the telephone prior to the doorbell or telephone ringing. •
Professor Harold Everett (
Richard Long), a widower and mathematics teacher at Collier University. Everett's three children are so rambunctious that he cannot retain a nanny to take care of them; In the first episode, the family has gone through five different
au pairs in less than a year before Nanny's arrival. Although the Professor soon admits Nanny is doing a very good job, his skepticism and Nanny's lack of references maintain his doubts as to whether she will work out, added to which the sheer implausibility of the many strange things that have happened since Nanny's arrival contradict Everett's discipline of practicality. Initially he spends most of his time working, but with Nanny's subtle prompting he begins to spend more and more time with his children. As the series progressed, there were increasingly subtle suggestions of a romantic interest developing between Everett and Nanny. •
Harold "Hal" Everett Jr. (
David Doremus), the oldest of the Everett kids, Hal is of above average intelligence and takes after his father's practical and skeptical persona; the two often play
chess together. Hal is also a tinkerer and inventor, though his experiments often go awry; one of his inventions is a prototype of what would later become known as
The Clapper. •
Bentley "Butch" Everett (
Trent Lehman), the middle child and Hal's younger brother, who hates his real name and, when he's not eating, enjoys sports and is an occasional prankster; He unsuccessfully attempts to frighten Nanny by hiding his pet guinea pig in her bag. Butch harbors jealousy and envy of Hal and has a penchant for following in his footsteps whenever Hal takes up a new career choice, though in one episode the tables are briefly turned when, after he mimics Hal's stargazing, he accidentally discovers a new
comet and the Bureau of Astronomics decide to name the comet after him. •
Prudence Everett (
Kim Richards), the youngest of the Everett kids and the Professor's only daughter. Prudence immediately takes a liking to Nanny when she first arrives. •
Mrs. Fowler (
Patsy Garrett) (recurring), the Everetts' sometimes nosy neighbor. •
Francine Fowler (Eileen Baral) (recurring), Mrs. Fowler's daughter and classmate of Hal. Francine has a terrible crush on Hal. •
Waldo, the family dog, an
Old English Sheepdog ==Episodes==