Madam Margaret, also known as Madam Margie, Principal Margaret or simply as Margie, is a one-shot villain who is the main antagonist in the episode "Operation: F.U.T.U.R.E." of the Codename: Kids Next Door series. She is the evil leader/principal of St. Rita's Preparatory School. She has a profound hatred for boys due to how she was teased by her brothers. Her goal and desire was to make a utopia of all girls and no boys. Apparently, she has the ability to communicate with her younger self and vice versa through a time machine.