Stargirl is best known for being a member of the Justice Society of America, although in the New 52 era, she briefly served on the government-sponsored Justice League of America.
Introduced in DCU Heroes Secret Files #1, Courtney Whitmore is the step-daughter of Pat Dugan, who previously fought crime as Stripesy, the sidekick to Sylvester Pemberton, a.k.a.
Stargirl later obtained the cosmic staff that previously belonged to Jack Knight, a.k.a.
Upon discover Pemberton’s superhero gear, Courtney donned it herself to start her own superhero career, leading Dugan to build the S.T.R.I.P.E. armor so he could keep her safe out in the field.