Emmy is an adolescent who lives with a group of orphans in a children's shelter in Kansas. After watching "The Wizard of Oz" with her friends, she wishes she could have a caring family like Dorothy's. While doing her chores she sings "My Heart Yearns for a Mother." Her friends help her sneak a look at her file, which contains the address of a home, not far away, where Emmy was found abandoned as an infant. Hoping to find her mother, Emmy heads for her former home. When she arrives she finds a spooky, broken down farmhouse that seems abandoned except for a friendly dog, whose collar says "Toto 2." Emmy trips an bumps her head. When she comes to, she finds a strange woman standing over here. When Emmy explains why she has come, the woman claims to be her mother. She serves Emmy some tea (Toto 2 also drinks some) which makes her groggy. As she is passing out, Emmy hears the woman say that she is not her mother but to remember, "...the East Witch is trapped in Kansas..."

Emmy and Toto 2 are gone and the woman, laughing to herself reveals that she is actually the Ghost of the Wicked Witch of the East, crushed all those years ago in Oz by Dorothy's house and doomed to haunt it until summoned back by someone from Oz. She tried to let her sister in Oz, the Wicked Witch of the West, know her whereabouts. She had used her tea potion plan once before, sending Emmy's real mother, Dorothy back to Oz, but she had never heard back.

Emmy wakes up with Toto 2 and recognizes that she is in Munchkinland in Oz. The Munchkins are sad. They have lost their parents. They sing "Are You My Mommy?" to Emmy and Toto 2. Their parents told them to wait as they went into the forest, but they never came back. Glinda the Good Witch arrives. She is much older and hard of hearing. She has a daughter, Katie who has taken over her power. The Wicked Witch of the West arrives, followed by her daughter Villa. It seems that when Dorothy melted the witch, she didn't melt all the way, but now she and her daughter have no power. Emmy wants to know how the Munchkins have lost their parents in Oz, where now there is only good magic. No one know, but Villa tries to be helpful (to the dismay of her mother) by mentioning the Land of the Lost Parents. After the witches leave, Emmy decides to go to the Land of the Lost Parents and suggest to the Munchkins that they come, too. They say they can't because their parents told them to wait in Munchkinland. Emmy doesn't know how to get there, but two strange vendors show up with road maps.

On the road, Emmy meets a scarecrow named Strawberry, who turns out to be the daughter of the original Oz scarecrow. Her father is missing. She sings, "If I Only Had a Dad," and joins Emmy.

Down the road, they come upon a Tin Girl named Rusteen, who is the daughter of the Tin Man. He is missing also. Se sings, "My Daddy" and joins the group.

In a forest, they meet a Lion Cub, named Cubby who sings about his father, the Lion in "My Dad Was Taken Away."

Hungry, Emmy looks for food and finds mushrooms and grapes who unexpectedly sing "Don't Eat Me!" They claim to have families. Emmy agrees to not eat them. Luckily her hunger is satisfied when the two vendors come by with apples.

Somewhere in Oz Katie and Villa meet. Each is envious of the other's mother. Katie wants a mother who does cool things like the Wicked Witch. Villa wants a mother who is kind as she sings "I Wish I Had a Mother Like Yours."

In a forest clearing a group of people are exercising, led by an amnesiac named Becky, found by the group in a poppy field. They are trying to stay fit and look young, they say so that they can get back home. But the exercise is hard as they sing "We're Old!" When Emmy and the froup arrive they discover that this is the Land of the Lost Parents. sEeing no Munchkins or parents of her new friends, she asks why their land has that name. One of the the people explains that they used to live in the Emerald City, until they were sent out to this retirement community by their children.

Their children were told by the Good Witch Katie that it was the best thing for everybody. Emmy says that it doesn't make sense for a Good Witch to say something so obviously bad! Emmy is told that that is because Katie is not what she seems.

The story is told about how babies were born into Oz. In a flashback we see the babies in the hospital nursery singing "The Happiest Place to Be is Oz." New babies are bon to Glinda and to the Wicked Witch. Two Mischief Monkeys enter the nursery and switch the beds of the baby witches. Next we see Glinda raising the wrong child. She tries to teach her to be good. The Wicked Witch is also raising the wrong child, trying to teach her to be bad.

Emmy and her friends then hear about how Katie lured the Munchkin parents into the forest and turned them into mushrooms and grapes. Strawberry, Rusteen and Cubby hear stories aobut how Katie took their parents away, too.

Emmy and her friends head for the Emerald City, to try to set things right. In the Emeral City, the residents are singing "Today is the Festival!" while working to get ready. The festival by order of Katie is called No Parents Day. There are speeches, questions answered by the East Witch from Kansas, as the Wicked Witch listens intently.

Emmy then tells the story of the baby switch and its results. The stunned daughters reunite with their rightful mothers. Katie, delighted at ther perfect new family, surrenders her magic wand. Now that the real good daughter has power, se sets to making things right. The gates of the Emerald City are opened to the Lost Parents, spells are broken and Munchkin families are reunited. The Scarecrow, Tin Man and Lion rejoin their children.

The Wicked Witch asks Villa, whom she raised for one last small favor. She uses the magic to bring her sister back to Oz. The Wicked Witch of the East recognizes the Lost Parents newcomer Becky and blames her for her family's lack of power. Becky, confused at first, begins to remember her life before the poppy field. She is, in fact, Dorothy! She had a baby named Emerald -- Emmy! Emmy and her mother, Dorothy are reunited. And they all live happily ever after.