In an attempt to separate what is known and what is the officially accurate, this article contains unconfirmed information on upcoming video games or other material that may or may not be completely accurate upon their release.
This does not included baseless speculation.
The Iron Heights Penitentiary was a mobile prison found inside an airship. It was reputed to be among the worst prisons in the world.
After Arkham City
The cannibalistic serial killer, Killer Croc, was captured at his den at the Lighthouse on Miagani Island by Warden Ranken, the corrupt Warden of Iron Heights Penitentiary, to be experimented upon for his regenerative abilities on October 27. The airship later crashed, due to sabotage by the then-recently escaped Croc as revenge for being experimented upon.
The airship then crashed into Bleake Island bay, not far from Panessa Studios. Nightwing witnessed the fall of the prison ship, notified Batman, and knew that this would most likely result in the prisoners escaping. Batman gradually learned about the reasons behind the crash, as well as Croc being on the vessel and why, and proceed to arrest the warden after he and Nightwing subdued Croc.
- Iron Heights Penitentiary is the main prison area for Central City, Star City and Keystone City for the DC Comics sister series, The Flash, where most of that series' rogues gallery are locked up. Like in the game, Iron Heights was considered one of the most brutal prison systems in the world. Unlike in the comics, however, it was mobile and was not located at Keystone.
- In the area where Ranken was captured by Killer Croc, there was a cell door with the words "Gorilla Grodd" on it, which alluded to the super villain from The Flash, who is also a regular prisoner at Iron Heights.