Arkham City's only story DLC, Harley Quinn's Revenge functions as an epilogue to its parent game's story. Unfortunately despite the intriguing narrative questions posed by that game's ending Harley Quinn's Revenge does little to grab the player's interest. You alternate between playing as Batman and Tim Drake's Robin in a neat twist to the regular Arkham format, and Robin even has a few unique skills to call on such as a shield, and both get their own combat and predator sequences so the core experience is preserved at least. However, the locations you fight through are insipid and the actual encounters are dull.