An insipid and tyrannical group of girls obsessed with community service and school spirit, The Marthas are the clique that Heather tries to join. They take advantage of her insecurity and eagerness, forcing her to decorate for their events and then taking all the credit for her work, even as they tell her that she has done a terrible job. Heather frequently enlists Melinda to help her with these projects. To Melinda, these girls represent the height of high school conformity and cruelty.