Kinda funny how they only had ONE security guard taking Joker to his cell.
Do all the inmates escape? In other words, you face most of batman's foes?
From Wiki :
https://en.wikipedia.org/wiki/Batman:_Arkham_Asylum
Characters
Bruce Wayne / Batman. He will be voiced by actor Kevin Conroy, who reprises his role as the Batman from DC animated universe.[6]
The Joker: He will be an inmate in the asylum and the main antagonist. He will be voiced by actor Mark Hamill, who reprises his role as the Joker from the DC animated universe and Birds of Prey.[7]
Commissioner James Gordon.
Barbara Gordon / Oracle: A radio contact for Batman throughout the game.
Waylon Jones / Killer Croc: Screenshots show him as an enormous, reptilian creature, towering over Batman.[8]
Edward Nigma / The Riddler and Bane are also confirmed for the game.[9]
The September 2008 issue of Game Informer revealed that Harley Quinn and Mr. Zsasz, (who will be voiced by Danny Jacobs),[10] will also be villains in the game.[11]
Game Informer further states they saw evidence through concept art, in-game clues and hints around the offices of Rocksteady Studios that widen the possible cast of villains to include, The Penguin, Mr. Freeze, The Scarecrow and Poison Ivy.
Also, according to the Game Informer article, collectibles include "Joker Spray Cans" and "Two-Face Coins" this implies that Two-Face might also be featured in the game.
Screenshots released of an unnamed character bear a striking resemblance to and may be Amygdala.[12]
IGN.com has recently stated that their writers were treated to a viewing of some of the story and game play. In the story sections it was revealed Harley Quinn is the one who springs the jokers trap in Arkham, and she appears more adult than her comic and Television counterparts [13]
I've heard Arkham is compared to Rapture in Bioshock. Should be awesome.