Arnold Flass

Detective Arnold Flass is a crooked cop appearing in the Batman comic series and the movie Batman Begins portrayed by Mark Boone Junior.

Comics
1986's Batman: Year One introduced Flass as a cheerful and chummy jock with a dark side. Burly, blond, and clean shaven, Flass was Jim Gordon's partner on the G.C.P.D. and Gordon's first introduction to Gotham's seediness. Indicative of much of the Gotham City police force of the time, Flass was extremely corrupt, often on the take for powerful politicians and crime figures. He was resentful of the strong moral character of Gordon (whom he condescendingly referred to as "Jimmy") and attempted to teach him a lesson. Flass and several other officers accost Gordon and beat him mercilessly. Gordon soon turned the tables on Flass, beating and humiliating him, thus beginning his crusade against the corrupt element in the police force.

Batman later captured Flass and turned him over to Gordon, who charged him for affiliation with the underworld. Then-Assistant District Attorney Harvey Dent offered Flass a plea bargain he couldn't refuse: in exchange for testimony against Carmine "The Roman" Falcone and then-Police Commissioner Gillian Loeb, Flass would receive a lighter sentence. Flass accepted the offer, and since he was intelligent enough to record extensive notes of his dealings with the Mob, Dent had ample evidence to prosecute much of Gotham's organized crime.

After Year One, Flass made only occasional cameos in the Batman series. He was the third victim of the Hangman killer during the limited series Batman: Dark Victory. Gordon found him working as a bouncer at a sleazy strip club called the "Cheetah Room," and he was killed there while on his smoke break. Judging from the abrasions on his body, it appeared he tried to put up a fight.

Batman Begins Timeline
Flass was partners with Jim Gordon sometime in 2005. At the time, Flass was "moonlighting as a low-level enforcer" for mob boss Carmine Falcone. Flass apparently took pleasure in tormenting the petty thugs Falcone hired; whenever he arrived on the scene, he'd be a serious cop, inquiring as to what the thugs were doing, and making them nervous. Then he'd laugh and tell them to continue.

One night he was present at the Gotham Docks when Batman made his first appearance in the city's history. Flass left the scene, but Falcone and the thugs were apprehended and left for the police. Some time later, Flass was busy stealing cash from a food vendor. As he walked away, Flass was yanked off the ground and about ten stories into the air by Batman, who interrogated him about the other drugs. After telling Batman what he knew, Flass was released.

He was also present at Arkham Asylum some few nights later. At this time, Batman had attacked the asylum and foiled another of Jonathan Crane's plots, and rescued Rachel Dawes. Flass and the entire SWAT team that had arrived were attacked by a flock of bats summoned by Batman's HF transponder. Two nights later, the night of the attack on the Narrows, Flass was infected with the fear toxin and restrained by Gordon.

The ARG based on what happened between Batman Begins and The Dark Knight said that Flass was later incarcerated in Arkham. Some time later, an investigation by Harvey Dent made Flass' illegal activities public, and Flass was suspended and lost his disability pension.