Harley Quinn's Revenge DLC Gameplay Walkthrough - Part 4 (Xbox360, PS3, PC)

"Harley Quinn's Revenge" sends players back into Arkham City to face their final challenge as they interchange between playing as both Batman and Robin. Gamers must utilize each of the characters' unique combat and investigative skills to uncover Harley's vengeful plan and shut the gates on the urban mega-prison forever.