She grew up as Mary Bromfield, although her real name was Batson – twin sister to Billy Batson, the boy who could turn into The World's Mightiest Mortal! Once the truth is learned, The World's Mightiest Mortal and the World's Mightiest Boy begin searching for the long-lost twin – only to find they must save her from kidnappers! Mary learns that saying “S-----!” turns her into The World's Mightiest Girl, the third of the soon-to-explode Mighty Family. She had appearances in many magazines, including her own comic title.