The final chapter in the 'Arkham City' story comes packed in for free.
'Batman: Arkham City' was one of the biggest and most beloved games of 2011, but it's not over yet. The Game of the Year Edition will be launching on May 29th for Xbox 360 and PlayStation 3 and will include Harley Quinn's Revenge – a story-based piece of DLC that will be the final chapter for the game.
In addition to the Harley Quinn DLC, you'll get Catwoman, Nightwing and Robin, as well as the 'Batman: Year One' animated feature and more.
Source: Game Informer