Payback

''You may also be looking for the episode "Payback" Payback was a brutal vigilante set out to avenge neglected children. He wielded a laser whip to punish his targets. Payback was in fact a neglected child himself, Kenny Stanton.

History
Kenny's father, Dr. Stanton, was a therapist who ran Gotham Youth Counseling Center, where he spent great amounts of time helping afflicted kids. However, in doing so, he ended up neglecting his own son. Tired of being dumped to the care of Howard Lewis, the center's librarian and sculptor, Kenny turned his rage on those who had been bullying or abusing teenagers. He also deduced that if he solved the problems of his father's patients, he'd finally have more time for him. So, Kenny put on a 6 feet tall exoskeleton and stole Lewis's hilt to use as a laser whip. Dubbing himself Payback, Kenny cast himself in the role of a vigilante on par with Batman, or so he liked to think.

Kenny had access to his father's Vidlinks sessions, which he used to select his victims. Then, he engaged employers, teachers, and parents ― anyone whom the patients complained about during counseling. In the middle of one attack on a clothes shop's manager, Payback was interrupted by Batman, who didn't appreciate being compared to the rampant vigilante. Payback took him on, and then retreated.

Payback's attacks were pretty brutal, and he always shot to kill. He nearly killed the shop's manager, and plunged a moving car off a cliff. On both instances he would have murdered his victims, had Batman not intervened on time.

After listening to Terry McGinnis' rant about Bruce Wayne, Payback chose the latter as his next target. Little did he know he was walking into a trap laid down by Terry, in an attempt to draw him out. Payback attacked Bruce in the inauguration of the Vreeland Marquis Hotel. He cut the brakes of an elevator, and Bruce would have fallen from several stories, if Batman hadn't promptly stepped in. Then, Payback severed a stone pillar and hurled a massive boulder at Batman. But in doing so, the floor he was standing on caved in, and Payback plunged to the ground. Batman caught him in midair, at which point his mask fell off, revealing his true identity. Kerry broke into tears and then was taken into GPD custody.

Batman Beyond

 * "Payback"