Just a reboot. They could have two part episodes (or single episodes that would last an hour), each story would cover an event or story from the comics but taking place in the same continuity. The primary goal would be to cover Batman's entire career from the comics.
Example: The first two (or hour long episode) could focus on the mystery of the Redhood. The story would end with everybody under the impression that the ringleader died after falling into the vat of chemicals. The next story would focus on something else. The one after that could pick up where the first one left off by doing an adaptation of The Man Who Laughs. And so on.
Imagine having a weekly animated series that's similar to this.