Supergirl: Bizarrogirl — Sterling Gates

Enter Bizarro Supergirl! But how did she get to Earth and what does she want? The real Supergirl better find out fast, or else there won't be much left of Metropolis to save! And to make things worse, an even bigger threat looms on the horizon with an eye for the Girl of Steel. Collected from SUPERGIRL #53-59 and ANNUAL #2.