Ratcatcher

Otis Flannegan had been rat catcher on Gotham City, but at some point he developed the ability to control rats, like Willard or The Rat King, enemy of the Teenage Mutant Ninja Turtles. Flannegan adopts the name Ratcatcher, commanding his army of rats, wearing a gas mask, and wielding an exterminator's gas gun.

Pros: An army of rats looks kinda cool on screen.

Cons: It's been done (twice) with Willard, and commanding an army of rats doesn't fit with the realistic themes of the movies.

How I'd do it: It's still a stretch, but the Ratcatcher could develop some kind of rat control technology, or training methods. He could start out as a research scientist doing rat-in-a-maze experiments, I guess, and somehow figures out a way to get rats to do his bidding.

Casting Guesses: Crispin Glover? It'd have to be someone nerdy and unsettling. Michael Emerson (Ben Linus from Lost) certainly fits that description.

Verdict: Now that I give it some thought, it's not quite as ridiculous as most of the other villains this week. But it's still never gonna happen.