Batman: Assault on Arkham
Batman rescues Riddler from a black ops assassination ordered by A.R.G.U.S.' director Amanda Waller, returning him to Arkham Asylum. Invoking Priority Ultraviolet, Waller captures criminals Black Spider, Captain Boomerang, Deadshot, Harley Quinn, KGBeast, Killer Frost, and King Shark for the Suicide Squad. Their mission is to break into Arkham and recover a thumbdrive in the Riddler's cane. While in Waller's employ, Riddler copied information on the squad to make it public knowledge. She forces compliance by threatening to detonate nano-bombs implanted in their necks. KGBeast, who believes it's a bluff, walks out on Waller and is killed as an example to the others.