Mary is the middle child of the The Sanderson Sisters and secondary antagonist of Hocus Pocus.
Mary seems to have a 'sister complex', constantly trying (and failing) to please her older sister, Winifred Sanderson . As such, she has a slight rivalry towards the youngest sister, Sarah Sanderson . She is often the mediator of the trio, and often tries to calm her sisters down. She is fascinated by television
- Mary will become Pooh's enemy in Winnie the Pooh says Hocus Pocus.