Fan Casting Batman: The Ultimate Detective

Joker, Riddler, and Scarecrow have just been caught by Batman, Bruce Wayne, Riddler, and Scarecrow were found guilty and sentenced without a problem, however, something strange started happening when the Joker's Trial started. The Joker murders didn't stop, and since the Judge and Jury were almost as corrupt as the criminals themselves, it looked like The Joker might be set free. Meanwhile, a different string of murders and robberies started, the banks and bodies were found smashed up and broken and covered in vines and other plants, two of the victims were the parents of a young child, Bruce adopted that child and trained him to become his sidekick. Will Batman catch the Joker copycat and the other criminals? Or will Batman fail?