Batman vs Bruce Wayne
During the JLA's fight with a mysterious wizard, Batman is sucked into a wormhole, taking him to a parallel universe. Once there, he recognizes the place as Gotham City, but it looks much different...much darker.
It doesn't take Batman long to realize that no law and order exists in this Gotham. The city officials, police, and everyone in authority is corrupt. Crime has taken hold of Gotham and the average citizens lives in fear.
Batman soon finds out who is responsible for this chaos....Bruce Wayne. In this reality, Bruce Wayne became corrupt after his parents death. He eventually joined the military and became the most elite special ops soldier that the U.S. military had ever seen. During this time, he studied and trained in all the various martial arts that Batman had done in his universe. During Bruce's time in the military, he learned to kill...and he became quite efficient at it. The military never knew how power hungry and how viscious Wayne truly was. He fooled every psychological profiler the military had available.
After leaving the military, he returns home to Wayne Manner, and, along with Alfred, began plotting ways to rule Gotham City. He used his money to pay off and bribe city officials..and made sure that only the officials he bribed were elected to public office. He handpicked every police officer in town to uphold his own corrupt vision of law and order.
Bruce Wayne also has his own "Bat Cave" in this universe...with technology just as efficient as Batman's. He is Batman in every way except he wears no mask..and he is not opposed to killing anyone.
Batman wants to bring law and order to this Gotham...in this Universe. Can he stop this Bruce Wayne...and let Gotham's citizens live in peace?