Jill, Mary Bennett, Patsy, and Gerald are united by their outsider status in high school. When Tammy, a beautiful but insecure redhead, moves into town and is humiliated by the in-crowd, Jill and company form the Tammy Club to bolster her spirits. The five enter the homecoming parade in wild dresses and red wigs, but a misprint on their sign (it reads Yammy instead of Tammy) leads to the five rechristening themselves the Sweet Potato Queens.