Harley Quinn becomes fascinated with the Joker while interning at Arkham, and volunteers to analyze him. She falls hopelessly in love nearly instantly with the Joker during their sessions, and ends up helping him to escape from the asylum (on more than one occasion). When the Joker is returned to Arkham after a battle with Batman, the sight of her badly injured patient drives Harley to don the costume and become Harley Quinn, the Joker's sidekick and on/off girlfriend.
Sony Online Entertainment announced earlier this week that DC Universe Online (DCUO), has reached gold master status and will be available at retail outlets worldwide on the PlayStation 3 computer entertainment system and PC on January 11, 2011. DCUO, licensed by Warner Bros. Interactive Entertainment on behalf of DC Entertainment,will be the first online game based in the DC Universe, the first MMO on PlayStation 3, and the first time DC Universe Online will be accessible to the millions DC Universe fans.