“In 1965, Jon Stone and Tom Whedon came up with the idea of a television series based on a mixed-up version of a fairy tale told over a season of Saturday mornings. They planned to do Snow White and sold the concept to CBS, which commissioned a script. Familiar with Jim Henson's Muppets from variety shows and commercials, they signed him on to work on the show. Jim was thrilled as he loved Disney's Snow White and wanted to try his hand at it.
The network eventually passed on the show, so they took the script over to ABC who loved it. ABC asked them to change it to Cinderella, however, because CBS had originally commissioned the Snow White story making it somewhat 'tainted' (according to Jon Stone). The half-hour pilot was shot that October but never aired.