Given The Batman is suppose to be doing a more "grounded" approach, I wonder how they're gonna do Clayface.
Man, I was really hoping for Killer Croc, the whole Gotham being flooded would have been perfect to use him.
The Court of Owls taking Mr. Freeze's wife, Nora to force him to work on their unethical experiments in search of a legend called the Lazarus Pit. Since the Court would want immortality to make sure their rule was set in stone.
Meanwhile Batman is still dealing with the Gotham City still being flooded and there had also been rumors of a giant crocodile man being whispered throughout the city. So that would be Batman's first act of investigation leading him to Freeze and potentially Croc as Victor's lackey, as he experiments in the sewers.
Plus, Mr. Freeze's powers and Croc himself, would arguably work exponentially well considering the flooding of Gotham.