Kara Zor-El is Superman's younger cousin and sidekick. She and Stephanie struck up an easy friendship after Kara rescued the young hero and Catwoman from a watery grave at the behest of Oracle. Stephanie quickly introduced herself as Batgirl and informed Kara that she had discovered Toyman was holding the Kryptonite Man captive and torturing him, when one of the Toyman's robots overwhelmed her and Catwoman and put them in this predicament. The two girls agreed to go investigate, leaving Catwoman behind. More information on Kara here!