Victor Zsasz

A true sociopath, Victor Zsasz grew up in a life of ease but nonetheless became a serial killer. Indiscriminate in his prey, body count is the only thing that matters to Zsasz. He takes pleasure in arranging the corpses of his victims in life-like poses before carving a mark for each of his victims into his own body. He is saving a special spot for the Batman.

Road to Arkham
Victor Zsasz was already imprisoned in Arkham Asylum before of the events of Joker's takeover of the island. During a patient interview between him and Dr. Cassidy, Zsasz revealed through scary clues that he knew of Dr. Cassidy's four locks on her apartment door, how she forgot to buy cat food "again" and how every night she sat in her red chair with her cat on her lap (revealing that he stalked her before his imprisonment). Both scared and worried that Zsasz knew where she lived; Cassidy took leave from Arkham in order to get away from the insane serial killer.

Soon after Dr. Cassidy took her leave; Zsasz managed to smuggle a knife into his cell during another patient interview. Zsasz lashed out killing all guards sent into cell to stop him. Victor was forced to surrender when four guards aimed their shotguns at him; Zsasz was then sent into soldiery confinement for his actions given tons of time to carve in 20 new tally marks. However Victor didn't stay long in soldiery nor in Arkham at that manner; Zsasz soon escaped Arkham and returned to Gotham City to kill Dr. Cassidy.

After the door was answered, Zsasz kidnapped Sarah. Zsasz took Dr. Cassidy to an Old County Hospital in order to kill her. An anonymous tip was found in Cassidy's office, leading Batman to the hospital, where he saved Cassidy from her gruesome demise. Zsasz was subsequently put back into Arkham; vowing that one day he will kill the Dark Knight if he ever got the chance.

Batman: Arkham Asylum
During the Joker's takeover of Arkham, Zsasz was let loose from his cell in the Intensive Treatment Center. Running free, he encountered two Arkham security guards in the Patient Pacification Chamber. After killing one guard who tried to stop him, he took hold of another guard named Mike, and strapped him to an electric chair.

A third guard, Zach Franklin, came across Zsasz, and sounded the alarm, requesting backup on the radio. At least three more guards responded to the alarm and arrived with Dr. Gretchen Whistler, Zsasz's personal therapist. He warned that he would kill Mike if he saw "anything that looked even a little bit like a bat" getting too close whilst the guards attempted to talk him down. Zach Franklin and another guard stood barred at the entryway to the Pacification area, but were able to see Zsasz pacing behind his hostage in the electroshock chair. Franklin tried to call for more backup in the Processing Corridor in dealing with the hostage situation, but found no answer on the radio, as most of the other guards in the vicinity had been murdered by the Joker after his escape through the area.

A surviving guard, Eddie Burlow, picked up the call near the door to the Decontamination Chamber but was unable to respond. He directed Batman to the Patient Pacification Chamber. Batman arrived on the scene and met Zach Franklin, who informed him of the situation. Batman used the chamber balcony and grappled behind Zsasz on the gargoyles that lined the top of the room. He snuck up on Zsasz, taking him out and leaving him back in the care of Dr. Whistler and the Arkham staff. He warned Dr. Whistler that it would take much time before Zsasz could be cured, if he could be cured at all. Soon after, Harley Quinn trapped the Arkham staff in the Pacification Chamber. One of the security personnel covered Zsasz with his shotgun to prevent any escape.

But yet Mr. Zsasz somehow escaped once again, killing three security guards above the Penitentiary in Arkham West. He then proceeded to prop them up like rag dolls around a table as if they were enjoying a game of cards. After the Joker's men had taken control of the Penitentiary, Zsasz proceeded to the heavily-guarded Arkham East. While the Joker's men wrestled the area from the guards, Zsasz invaded the Botanical Gardens. He entered the Botanical Glasshouse Entrance, where he encountered three more members of security at the doorway to the Botanical Glasshouse. Zsasz murdered two of them, arranging the dead guards in a lifelike pose around a park bench. After killing several more Arkham staff, Zsasz scratched out the tallies of his kills onto the bench. Shortly after, the Joker came across Zsasz in the Glasshouse Entrance with his latest victims. ("No doubt acting out some twisted fantasy", according to Joker) The Clown Prince of Crime took Zsasz to the Arkham Mansion after his men had captured Dr. Penelope Young in the Library, planning to torture the formula for her secret Titan drug out of her.

Mr. Zsasz asked to be left alone with Young and successfully forced the secret out of her. Batman searched the mansion until he came across Zsasz, who was holding Dr. Young hostage with a knife to the throat. The Joker, contacting Zsasz via a monitor, tried to convince Zsasz to hurry up and kill her. Zsasz began to panic as he knew Batman would take him down if he did just that but he was also torn by his desire to kill her, slowly savoring her fright and saying that she was "just begging to be slaughtered". Before he could make a decision, Batman knocked him out with a Batarang to the head.

Dr. Young was driven to so many tears while Zsasz held her hostage and nearly killed her. She beat his unconscious body angrily, yelling at him "You monster! You evil, evil, evil monster!", while still crying. After Young was killed by an explosive set by Joker and Harley Quinn set her goons on Batman, Zsasz disappeared, suggesting that he escaped during the chaos, as no guards had arrived to detain him.