Mary Poppins Returns development hell since the release of the 1964 film. Walt Disney attempted to produce a sequel a year subsequent to the film's release, but was rejected by author P. L. Travers, who had openly dismissed Disney's film adaptation. In the late 1980s, then-chairman of Walt Disney Studios Jeffrey Katzenberg and vice-president of live-action production Martin Kaplan approached Travers with the idea of a sequel set years after the first film, with the Banks children now as adults and an older Mary Poppins with Julie Andrews reprising the role. Travers again rejected the proposed concept with the exception of Andrews' return.
Mary Poppins (film) of the Travers–Disney correspondence is part of the Travers collection of papers in the Mitchell Library of New South Wales, Australia. The relationship between Travers and Disney is detailed in "Mary Poppins She Wrote", a biography of Travers, by Valerie Lawson. The biography is the basis for two documentaries on Travers, "The Real Mary Poppins", and Lisa Matthews' "The Shadow of Mary Poppins". Their relationship during the development of the film was also dramatized in the 2013 film "Saving Mr. Banks". Julie Andrews, who was making her feature film acting debut after a successful stage career, got the prime role