Mary Poppins Comes Back

Mary Poppins Comes Back is a sequel to the 1964 film ''Mary Poppins. ''

Plot
Unknown. It would have been based on the sequel of the same name.

Why It Was Cancelled

 * 1) The original author, P.L. Travers￼ disowned the original film.
 * 2) They were unable to get Julie Andrews to reprise her role as the title character, because she wasn't interested in returning, due to her semi-retirement at the time.

Results

 * Disney would make a official sequel in 2018, with Emily Blunt as Mary Poppins. Although, the sequel is more of a retread of the original.