Professor Everett's three rambunctious children scare away another housekeeper. Suddenly at the door appears Nanny, unbidden and undaunted, bringing mystery and magic to a family that doesn't know how much they need her.

Prudence has a nightmare with a monster named Wiblet, and Nanny helps her overcome her fears.

Butch is negatively influenced by a "hip" kid when the Professor misses another one of his activities.

A new girlfriend of the Professor thinks that Butch and Prudence are not grounded in reality and should be involved in her children's therapy group. Butch tests whether there is a tooth "elf" by not telling his father when he loses a tooth.

Hal gets a telescope for his birthday but Butch is the one who discovers a new comet.

Nanny suggests a family picnic on a lovely Spring day. The family members all have other ideas until their plans are mysteriously thwarted. Just when they are all ready to go on their outing, another problem pops up. Nanny keeps the picnic and fun going on anyway and they have a great Saturday together.

The Professor gives Nanny driving lessons as the pair prepare for a second household car.

Nanny and the children's rescue of some ducklings leads to trouble for Nanny.

Waldo finds a dinosaur bone and buries it in the yard. Nanny and the children's hunt for a rose bush eating gopher uncovers Waldo's treasure and results in dig for more!

Nanny and the children stage a protest to stop the city from cutting down a favorite tree for a road expansion project.

Professor Everett receives a fabulous job offer from Astrodynamics, but it means moving to Astroville. The children don't want to leave their home, but put a brave face on for their father's sake.

The Professor is contacted out of the blue by an old college girlfriend and isn't sure he's ready to see her again. Prudence's favorite balloon pops and she doesn't want to risk losing a new balloon by inflating it.

Hal feels too much pressure to complete various projects and school work, with a big science competition being foremost, it's making him irritable and miserable. Nanny offers a good luck piece, that acts like a magic amulet that restores his confidence so much he no longer worries at all and becomes careless.

Sebastian, the rooster Prudence raised from a chick has finally learned to crow. Now if he would only learn to crow at sunrise instead of the middle of the night.

Nanny convinces Butch to run for class president. Butch is running on the issues but his opponent is running on free bike rides and ice cream. Butch has to decide how much he wants to win.