In 1910s rural England, two young children, Jemima and Jeremy, are enthralled by the wreck of a champion
racecar. When they learn it is due to be
scrapped, they vow to ask their father, widower and eccentric inventor
Caractacus Potts, to save it. They shortly meet the wealthy
Truly Scrumptious, who drives them home to report their
truancy to Caractacus; she leaves angered when he rejects her concerns. To raise money for the car, Caractacus attempts to sell one of his inventions, a musical candy whistle, to the large Scrumptious candy company, which Truly is heiress to; however, the sound attracts a horde of dogs, ruining his sales pitch. That evening, Caractacus goes to a
carnival and attempts to raise money instead with an automatic hair-cutting machine. Fleeing a furious customer whose hair is accidentally ruined by the machine, Caractacus joins a song-and-dance act. He earns enough money in tips to buy the car and rebuilds it, naming it "Chitty Chitty Bang Bang" after its unusual engine sounds. For their first trip in the car, Caractacus and the children go to a beach to have a picnic. They are joined by Truly and enjoy their time together. Caractacus then tells the children a story.
Caractacus' story Baron Bomburst, ruler of the land of Vulgaria, attempts to steal Chitty while it is stranded by high
tide. The family escapes thanks to Chitty's sudden transformation into a boat, and Caractacus returns Truly to Scrumptious manor; she finds she has fallen in love with Caractacus. The Baron sends two spies to get the car. During one attempt, the spies accidentally kidnap Truly's father, Lord Scrumptious, and his valet; they take advantage of the blunder by disguising themselves as English
gentlemen, hoping to kidnap Caractacus. Arriving at Caractacus' home, they mistake Grandpa Potts for him. The spies take Grandpa's
outhouse with him inside using Bomburst's
airship and the Vulgarian party flies away. When Caractacus, Truly, and the children follow them, Chitty sprouts wings and
propellers, and Caractacus flies the car to Vulgaria. Grandpa is taken to Bomburst's castle, where the Baron has imprisoned other elderly inventors, and ordered to make another floating car. When the Potts party arrives in the neighbouring village, they learn that children have been outlawed in Vulgaria as Bomburst's wife, the Baroness, abhors them. The local
Toymaker hides the group in his
shop from Bomburst's soldiers and
Child Catcher. The Potts family and Truly disguise themselves as
jack-in-the-boxes. Chitty is taken to the castle. While Caractacus and the Toymaker survey the castle, and Truly searches for food, the Child Catcher returns and kidnaps Jeremy and Jemima. The Toymaker takes Caractacus and Truly to a grotto beneath the castle where the townspeople have been hiding their children; there, Caractacus concocts a scheme to free Vulgaria from the tyranny of the Bombursts. The next day during Bomburst's birthday, the Toymaker sneaks Caractacus and Truly into the castle disguised as lifelike dolls that sing and dance. At Caractacus' signal, the Vulgarian children swarm the
banquet hall, overcome Bomburst's guests, and capture the Baron, Baroness, and Child Catcher. The Vulgarian townsfolk storm the castle, while Caractacus, Truly, and the Toymaker free Jemima and Jeremy. The group joins the fight against Bomburst's soldiers; Chitty comes to their aid, and Grandpa is rescued. With the battle won, the Potts party bids farewell to the Vulgarians and fly home to England.
After the story As Caractacus' story concludes, the children ask if it ends with him and Truly married, but Caractacus does not answer. He later apologizes for his children when he takes Truly home, saying that the difference in their social status would make a relationship between them unfeasible, offending Truly. Returning home, Caractacus is surprised to encounter Truly's father Lord Scrumptious, who is revealed to have been Grandpa Potts' former
brigadier. Lord Scrumptious offers to buy Caractacus' failed candies and market them to the public as dog treats. Overjoyed, Caractacus rushes off to tell Truly, whose house staff has already told her the news, and she meets him halfway. They confess their love for each other and agree to marry. As they return home, Chitty flies up into the sky, this time without wings. ==Cast==