Arkham City, a place for criminals that are just to much to function in normal society. Hugo Strange came up with the idea of the city and Protocol 10 when the Joker took over Arkham Asylum. It is centered in Old Gotham and has caused quite the problem.
OH NO! The Inmates have complained taken over Arkham City! Since Protocol 10 was stopped and the Joker is dead, what can any one do to stop them from breaking out of the city and into Gotham?! Batman is no where in sight after the death of Joker and the only one left is Robin and Nightwing. Can they stop the Inmates before not chaos rains over Gotham and Arkham City?!