"The movie takes place, maybe two years before the first video game, which is Arkham Asylum," says Jay Oliva, director of Batman: Assault on Arkham. As far as the plot goes, "Basically, the story is, Amanda Waller pulls together a bunch of criminals to steal something that the Riddler has," says legendary voice director Andrea Romano. Screenwriter Heath Corson adds, "The Riddler has hacked [Waller's] computer and has downloaded a list of everyone who could possibly be in the Suicide Squad." This most likely means that the Suicide Squad is sent into Arkham to silence the Riddler before the list is released into the open.
The rest of the creative talent goes on to say that Batman doesn't actually come into the film until a bit later and that initially, the camera is showing events from the perspective of the bad guys. The screenwriter, Corson, then adds that one of the first decisions needed to be made on the project, was deciding the roster of the Suicide Squad, which has had a lot of members come and go over the years. The first selection everyone agreed upon was Deadshot, then Captain Boomerang. "Right off the bat, you'll know that Captain Boomerang and Deadshot don't like each other," says Oliva. The next member to be finalized was Harley Quinn. The other members are King Shark, Killer Frost and Black Spider. Although, my suspicions are high about Black Spider. Don't be surprised if under that mask, it turns out that it's really Rick Flag, Jr or Steve Trevor. Also appearing in the film are Batman adversaries, the Joker, Penguin and as previously mentioned, the Riddler.