One of Our Dinosaurs Is Missing
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Directed by: Robert Stevenson
Produced by: Bill Walsh
Written by: Bill Walsh
Based on: The Great Dinosaur Robbery by David Forrest
Starring: Peter Ustinov, Helen Hayes, Clive Revill, Derek Nimmo
Music by: Ron Goodwin
Cinematography: Paul Beeson
Edited by: Peter Boita
Production company: Walt Disney Productions
Distributed by: Buena Vista Distribution
Release date: 9 July 1975
Running time: 100 minutes
Country: United Kingdom, United States
Language: English
Box office: $5.5 million (North American rentals)

One of Our Dinosaurs is Missing is a 1975 comedy film, which is set in the early 1920s, about the theft of a dinosaur skeleton from the Natural History Museum. The film was produced by Walt Disney Productions and released by Buena Vista Distribution Company. The title is a parody of the film title One of Our Aircraft Is Missing, in which both Peter Ustinov and Hugh Burden also appeared. The film was based on the 1970 novel The Great Dinosaur Robbery by David Forrest (pseudonym of David Eliades and Robert Forrest Webb).

Plot
Escaping from China with a microfilm of the formula for the mysterious "Lotus X", Lord Edward Southmere, a Queen's Messenger, is chased by a group of Chinese spies. Back in London, Lord Southmere manages to escape from a chauffeur who is trying to kidnap him, and then runs into the Natural History Museum. Chinese spies follow him, so he hides the microfilm in the bones of one of the large dinosaur skeletons. He is relieved to meet his former nanny, Hettie, in the museum, and asks her to retrieve the microfilm. Southmere then faints and is captured by the Chinese, who tell Hettie and Emily (another nanny) that they are taking him to a doctor. Hettie and Emily enlist other nannies to help them search. They hide in the mouth of the blue whale display until after closing time and then begin looking over the skeleton of an Apatosaurus (referred to in the film as a Brontosaurus, a synonym that was in popular use at the time). They are unsuccessful, and most have to return home to care for their children, but Hettie, Emily and their friend Susan remain to continue with the search. They are captured and taken to the spies' London headquarters, underneath a Chinese restaurant in Soho. The nannies are locked up in the 'dungeon', with Lord Southmere. Fortunately, the nannies are able to outwit their captors and escape.

Meanwhile, the spies have decided to steal the dinosaur, so they can search it properly. That night, they trick their way into the museum. The three nannies follow on a motorbike and sidecar and watch from the shadows. After the Chinese load the Apatosaurus skeleton on the back of their steam lorry, the nannies steal the vehicle. The spies give chase through the foggy streets of London in their charabanc and a Daimler limousine, but the nannies drive into a railway goods yard, onto a flat wagon at the back of a train, and are carried off to safety. The nannies fail to find the microfilm on the skeleton. Meanwhile, back in London, Hettie's two young charges, Lord Castlebury and his younger brother, Truscott, have been captured by the spies. They are taken to the museum and the chief spy retrieves the microfilm from the other large dinosaur, a Diplodocus skeleton. The two boys are allowed home and tell Nanny Hettie the news.

Realizing that Lord Southmere is now in danger, Hettie organises a rescue. Hettie and her team of nannies invade the Chinese restaurant base and battle with the spies over Lord Southmere. Meanwhile, Emily and Susan return with the Apatosaurus and the lorry and bring the fight sequence to a shattering conclusion. Everything ends well and the secret of the mysterious "Lotus X" is finally revealed. It turns out that Lotus X is actually a recipe to Wonton soup, to which Southmere says that he tried to tell Wan that he was a businessman. Han then advertises the recipe and makes peace with the nannies.