One Of Our Dinosaurs Is Missing (1975)

An international secret formula, microfilmed and hidden on the massive skeleton of a museum dinosaur spawns a race between London based Chinese intelligence agents and a battalion of British nannies. Based on the novel THE GREAT DINOSAUR ROBBERY by David Forrest and directed by Robert Stevenson (MARY POPPINS). With Caucasian actors Peter Ustinov and Clive Revill playing Chinese villains in "yellowface", the film is embarrassing in 2026. I think the Disney organization knows this hence the film is unavailable (to the best of my knowledge) on streaming or physical media in the U.S. For some reason, all the actors including Helen Hayes as the leader of the nannies play their roles in annoying high pitched voices. The novel was aimed at adults but Disney has "disneyfied" it for the family market. The humor is silly (and not in a good way). With Derek Nimmo, Joss Ackland, Natasha Pyne, Jane Lapotaire, Roy Kinnear and Kathleen Byron.