Chitty Chitty Bang Bang is a 1968 musical adventure fantasy film, directed by Ken Hughes with a screenplay co-written by Roald Dahl and Hughes, loosely based on Ian Fleming's novel Chitty-Chitty-Bang-Bang: The Magical Car (1964).
The story opens with a montage of European Grand Prix races in which one particular car appears to win every race it runs in from 1907 until its final race in 1909, when the car crashes and catches fire, ending its racing career. The car eventually ends up in an old garage in rural England, where two children, Jeremy and Jemima Potts, have grown fond of it. However, a man in the junkyard intends to buy the car from the garage owner, Mr. Coggins, for scrap. The children, who live with their widowed father Caractacus Potts, an eccentric inventor, and the family's equally peculiar grandfather, implore their father to buy the car, but Caractacus cannot afford it. While playing truant from school, they meet Truly Scrumptious, a beautiful wealthy woman with her own motor car, who brings them home to report their truancy to their father. After she leaves, Caractacus promises the children that he will save the car, but is taken aback at the cost he has committed himself to. He looks for ways to raise money to avoid letting them down.
Later that evening, Potts discovers that the sweets produced by a machine he has invented can be played like a flute. He tries to sell the "Toot Sweets" to Truly's father, Lord Scrumptious, a major confectionery manufacturer. He is almost successful until the whistle attracts a pack of dogs who overrun the factory, resulting in Caractacus's proposition being rejected.
Caractacus next takes his automatic hair-cutting machine to a carnival to raise money, but his invention accidentally ruins the hair of his customer Cyril. Potts eludes the vengeful Cyril by joining a song-and-dance act. He becomes the centre of the show and earns more than enough in tips to buy the car and rebuild it. They name the car "Chitty Chitty Bang Bang" for the unusual noise of its engine. In the first trip in the car, Caractacus, the children, and Truly picnic on the beach. Caractacus tells them a tale about nasty Baron Bomburst, the tyrant of fictional Vulgaria, who wants to steal Chitty Chitty Bang Bang.
As Potts tells his story, the quartet and the car are stranded by high tide. The story then continues, in which they are attacked by pirates working for the Baron. All of a sudden, Chitty deploys huge flotation devices and transforms into a power boat, and they manage to escape Bomburst's yacht and return to shore. The Baron sends two spies to capture the car, but they capture Lord Scrumptious, then Grandpa Potts by accident, mistaking each for the car's creator. Caractacus, Truly, and the children see Grandpa being taken away by airship, and they give chase. They almost catch up with Grandpa, but they accidentally drive off a cliff.
As they approach the bottom, Chitty sprouts wings and propellers and begins to fly. The chase continues, and they follow the airship to Vulgaria and find a land without children; Baroness Bomburst fears and abhors children and imprisons any she find. Grandpa is taken to the castle, and has been ordered by the Baron to make another floating car just for him. He bluffs his abilities to the Baron to avoid being executed. The Potts' party is helped and hidden by the local Toymaker, who now works only for the childish Baron. Chitty is discovered and then taken to the castle. While Caractacus and the toymaker search for Grandpa and Truly searches for food, the children are caught by the Baroness’s Child Catcher.
The Toymaker takes Truly and Caractacus to a grotto beneath the castle where the townspeople have been hiding their children. They concoct a scheme to free the children and the village from the Baron. The Toymaker sneaks them into the castle disguised as life-size dolls for the Baron's birthday. Caractacus snares the Baron, and the children swarm into the banquet hall, overcoming the Baron's palace guards and guests. In the ensuing chaos, the Baron, Baroness, and the evil Child Catcher are captured. Chitty comes to their rescue and, at the same time, they are reunited with Grandpa. The Potts family and Truly bid farewell to the Toymaker and the rest of the village, then fly back home to England.
When Caractacus finishes the story they set off for home, stopping to drop Truly off at Scrumptious Manor, where Caractacus dismisses any possibility of them having a future together, with what she regards as inverted snobbery. The Potts family arrive back at their cottage where Lord Scrumptious surprises Caractacus with an offer to buy the Toot Sweets as a canine confection, re-naming them Woof Sweets. Caractacus, realising that he will be rich, rushes to tell Truly the news. They kiss, and Truly agrees to marry him. As they drive home, he acknowledges the importance of pragmatism as the car takes off into the air again, this time without wings.
After the credits, a screen with the words "Exit Music" appears with a reprise version of the "Chitty Chitty Bang Bang" theme playing.
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