In 1922, Walt Disney produced a Laugh-O-Gram cartoon based on "Cinderella", and he had been interested in producing a second version in December 1933 as a Silly Symphony short. Burt Gillett was attached as the director while Frank Churchill was assigned as the composer. A story outline included "white mice and birds" as Cinderella's playmates. To expand the story, storyboard artists suggested visual gags, some of which ended up in the final film. However, the story proved to be too complicated to be condensed into a short so it was suggested as a possible animated feature film as early as 1938 starting with a fourteen-page outline written by Al Perkins. Two years later, a second treatment was written by Dana Cofy and Bianca Majolie, in which Cinderella's stepmother was named Florimel de la Pochel; her stepsisters as Wanda and Javotte; her pet mouse Dusty and pet turtle Clarissa; the stepsisters' cat Bon Bob; the Prince's aide Spink, and the stepsisters' dancing instructor Monsieur Carnewal. This version stuck closely to the original fairy tale until Cinderella arrives home late from the second ball. Her stepfamily then imprisons Cinderella in a dungeon cellar. When Spink and his troops arrive at the la Pochel residence, Dusty takes the slipper and leads them to free Cinderella.