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Longest interval between the original film and a sequel

Longest interval between the original film and a sequel
Who
Wizard of Oz and Return to Oz
When
1985
A total of 46 years passed before the release of Walt Disney Production's Return To Oz (USA 1985), which resumed the story six months after Dorothy's return to Kansas in MGM's The Wizard of Oz (USA 1939). The sequel was based on the second and third of Frank Baum's 14 Oz books, The Land of Oz and Ozma of Oz.