Batman: Assault on Arkham

Batman rescues the 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 wanted supercriminals 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 Riddler's cane containing sensitive knowledge about the squad. She forces compliance by threatening to detonate nano-bombs implanted in their necks, and KGBeast is killed when he attempts to walk out on Waller. The remaining six are sent to Gotham City to get equipment from the Penguin, and while staying the night at the Iceberg Lounge Harley and Deadshot sleep together. The next day Harley commits a crime to lure Batman out, who is looking for a dirty bomb the Joker had hidden in the city. Harley is taken back to Arkham.