Cinderella (1950 film) overhears Cinderella humming the waltz played at the ball. Realizing that Cinderella is the mysterious girl, Lady Tremaine locks her in her attic bedroom. Later, the Duke arrives at the château, and Jaq and Gus steal the key from Lady Tremaine's dress pocket and take it up to the attic as Anastasia and Drizella unsuccessfully try on the slipper. Lady Tremaine's cat, Lucifer, ambushes the mice, but Bruno chases him out of the house, allowing the mice to free Cinderella. As the Duke is about to leave, Cinderella appears and asks to try on the slipper. Knowing it will fit,
Cinderella (1950 film) tall, regal character as he viewed fairies as tall, motherly figures (as seen in the Blue Fairy in "Pinocchio"), but Milt Kahl disagreed the characterization. Following the casting of Verna Felton, Kahl managed to convince Disney on his undignified concept of the Fairy Godmother. Unlike the human characters, the animal characters were animated without live-action reference. During production, none of Kimball's designs for Lucifer had pleased Disney. After visiting Kimball's steam train at his home, Disney saw his calico cat and remarked, "Hey—there's your model for Lucifer". Reitherman animated the sequence in which Jaq and Gus laboriously drag the key