Bert, a man of many professions, introduces the audience to Cherry Tree Lane ("Chim Chim Cher-ee Lyrics/Cherry Tree Lane- Part 1 Lyrics") in Edwardian London. Number 17 is where the Banks family lives: George and Winifred Banks, their two naughty children Jane and Michael, their cook, Mrs. Brill and their odd-job man, Robertson Ay. Things are not going well for Jane and Michael. They are out of control and, as the show starts, their latest nanny, Katie Nanna, storms out. After that, Mrs. Brill and Robertson Ay complain about living in a "madhouse." The children decide to write the advertisement for a new nanny ("The Perfect Nanny Lyrics"), but George, having a very different idea of what constitutes the perfect nanny, tears up the piece of paper and throws it in the fireplace. Within moments, Mary Poppins arrives, restored advertisement in hand, and takes charge of the Banks children, having every confidence in her own qualifications and merits ("Practically Perfect Lyrics").
On the children's first outing to the park, they meet Bert and, despite their reservations about his ragged clothes and dirty face, Mary teaches them that they must learn to look past appearances. To illustrate the point, Mary brings the park statues, including a mythological figure named Neleus, to life ("Jolly Holiday Lyrics").
While Mary manages the children, other problems lie with their parents. Winifred is aware that she is somehow disappointing both her children and her husband ("Being Mrs Banks"). George, on the other hand, can't understand why she finds the role of wife and mother so difficult ("Cherry Tree Lane (reprise)"). In an effort to please her husband, Winifred sends out invitations for a smart tea party. Mrs. Brill makes the preparations, while telling an eager Robertson Ay to keep his hands off. The children inadvertently sabotage the kitchen preparations, but Mary sorts it out with a lesson ("A Spoonful of Sugar Lyrics"). However, it is then revealed that none of the invitees are coming.
Mary takes the children to visit their father at the bank where he works ("Precision and Order"). There, George is busy dealing with possible investment clients: firstly, an ambitious man named Herr Von Hussler with an elaborate money-making scheme, and then a middle-class man named John Northbrook with a simple factory project. George is furious when Mary turns up with the children, but an innocent question asked by Jane (What's more important, a good man or a good idea?) makes him realise how much his values have changed ("A Man Has Dreams") since he was an idealistic young man. He then decides to accept Northbrook's project and rejects Von Hussler's, but unfortunately things take a turn for the worse afterwards.
Outside St. Paul's Cathedral, Mary introduces the children to the Bird Woman ("Feed the Birds Lyrics"). Jane is suspicious of her, but Michael responds to the Bird Woman and throws crumbs for the birds. On the trip home, the children meet the enigmatic Mrs. Corry who runs a magic sweet shop that also sells words ("Supercalifragilisticexpialidocious Lyrics").
The children return home in high spirits, unaware that things have gone wrong for their father. Unknown to them, George's decision to reject Von Hussler has cost the bank dearly, and he is suspended without pay. George explodes with rage at the children and they are sent to the nursery. Reacting to her father's outburst, Mary briefly points out that other members of the family are rarely there to take care of the parents, before Jane and Michael get into a fight over Jane's doll Valentine, prompting a displeased Mary to order them to bed and enchant them to sleep. The frightening consequence of Jane's anger becomes apparent moments afterwards, as Valentine and the rest of Jane and Michael's disgruntled toys come to life and join Mary in teaching them a lesson in how to take better care of their belongings and toys (formerly "Temper, Temper Lyrics", now "Playing the Game").
Believing that Jane and Michael need personal growth, Mary decides to leave Cherry Tree Lane ("Chim Chim Cher-ee – Rooftop Duet"), to bring them to their senses. Her distraught charges find a note saying that perhaps they will see Mary again eventually.
In a misguided attempt to please her husband, Winifred arranges for his childhood nanny, Miss Andrew, to take over from the suddenly departed Mary ("Cherry Tree Lane (Reprise)"). At the sight of her, a terrified George flees, exclaiming "the Holy Terror!" To everyone's shock and dismay, Miss Andrew is a brutal and cruel tyrant, quick to administer her own terrible elixir ("Brimstone and Treacle Part 1 Lyrics") and discipline by threatening to split Jane and Michael up through boarding school.
Terrified of their new nanny, the children escape to the park and find their good friend Bert, who cheers them up and helps Michael fulfill his dream of flying a kite ("Let's Go Fly a Kite Lyrics"). This marks the return of Mary. Jane and Michael are thrilled to be reunited with her, and then quickly tell her of the changes that have gone on at Number 17.
Mary (Laura Michelle Kelly) and Bert (Gavin Lee) during "Step in Time".
Also hiding in the park is George, who is depressed over his supposed lack of achievements ("Good For Nothing Lyrics"). Searching for him is Winifred, who at last understands her husband and the damage that was done to him by Miss Andrew ("Being Mrs Banks (Reprise) Lyrics").
When the children return to Number 17, Mary sets Caruso, Miss Andrew's lark, free from his cage. This leads to confrontation between the two nannies, ending with Miss Andrew having a taste of her own medicine as she is put in a large birdcage and vanishes down below ("Brimstone and Treacle Part 2 Lyrics"). Winifred and then George return at this point, surprised but pleased that Miss Andrew has "left".
On their next adventure, Bert introduces the children to his friends the chimney sweeps ("Step in Time Lyrics"). The sweeps' dance eventually enters the house, causing chaos. As the sweeps quickly exit, George receives a telegram from the bank requesting his presence there. George assumes that it is to seal his fate and decides it's time to sell the family heirloom. However, the vase is shattered accidentally by Mrs. Brill, who goes into a despairing shock since she had been cleaning it from the top of the shelf. When she is being led away for comfort, George goes to clean the broken pile himself, to find it reveal a collection of gingerbread stars from his childhood. This leads to a brief moment of reflection for George ("A Man Has Dreams/ A Spoonful of Sugar (Reprise) Lyrics"). After shaking hands with Bert, George leaves to meet the Chairman of the Bank.
At the children's encouragement, Winifred decides to follow her heart and be at George's side at the bank ("Anything Can Happen Lyrics"). Unseen to anyone else, Mary takes Jane and Michael to follow, where they watch the unfolding events.
At the bank, George is surprised to learn the consequence of his choice: far from ruining the bank, he has made a fortune by both rejecting Von Hussler and approving Mr. Northbrook's loan. They ask for the word that made them so successful, which George admits to be Mary's word, ("Supercalifragilisticexpialidocious (Reprise)"). Winifred, arriving to defend her husband, finds instead he is the hero of the hour. After she mentions Miss Andrew's name to the Bank Manager, the old man too relates his experience under "the Holy Terror". George apologizes for underestimating her, and together they return to the house ("Anything Can Happen (Reprise)").
Mary realizes that with the family reunited and happy, her task is done. With regret, she says goodbye to Bert with a kiss and sets off ("A Spoonful of Sugar (Farewell Reprise)"). Jane and Michael accept that Mary is leaving them and tell her that they'll never forget her. The two children watch as their parents waltz happily together and Mary flies high above the audience, disappearing in a flash.
Songs Lyrics from Mary Poppins the Musical Songs Lyrics
Synopsis to Mary Poppins the musical