I changed the plot to to being this. Both Catwoman and the Riddler would be working for the Black Mask, but the Cat woman would go rouge on the Black mask, and he is out to get her. At the sametime he is trying to take control of the city, and uses the riddler to cause trouble. It's too much for the police to handle, so Batman is once again called on to help out. The Catwoman would still turn into the new love in Batman's life, but the darkside of her life only comes out at the end.
We have our movie ladies and gents, now write up the script, screenplay and lets get this show on the road.