Given the enormous number of villains in the Batman comic books, many fans have been wondering what other bad guys will pop up on Gotham, aside from already-confirmed characters such as Catwoman (Camren Bicondova), Penguin (Robin Taylor), Riddler (Cory Michael Smith) and Poison Ivy (Clare Foley ll). Series creator Bruno Heller was asked during a recent interview if there are any nefarious rogues that are completely out of consideration for use on the show.

Here's his response, revealing that they are ready to go with any character from the Batman canon as long as it makes sense for the story. He then implies that even Killer Croc might be making an appearance in the future. Are there any Gotham city criminals that are off limits?

"The simple answer is: No. We're ready to go with any of them. We haven't excluded anyone from the mix potentially, but generally what we're looking at is characters where there is some drama or a story behind how they got to be the way they are. We're looking for characters who live in the real world of Gotham as opposed to the even more super real world of Metropolis if you like. It's not about super powers, it's about super will, if you like. We veer towards those characters who are interesting as people, rather than interesting for their particular power or their particular gimmick or their costume."

He did admit, though, that some characters will be much more difficult to bring on, including Killer Croc, although he teased that villain may be appearing on the series.

RELATED: The Riddler Emerges in New Gotham Season 2 Photos
"There are certainly characters that would be very difficult to put on the screen. That crocodile guy [Killer Croc] is a tough one - although we may go there"

In addition, Fox has released a clip, a new trailer and 12 photos from the second episode of Gotham, entitled "Selina Kyle", although, ironically, none of these photos feature the future Catwoman herself, played by Camren Bicondova. Instead, we get new looks at Carol Kane as Penguin's mother Gertrud Kapelput, Richard Kind as Mayor James, Victoria Cartagena as Montoya and Andrew Stewart-Jones as Allen, along with series regulars Ben McKenzie (James Gordon), Donal Logue (Harvey Bullock), Jada Pinkett Smith (Fish Mooney) and Robin Taylor (Oswald Cobblepot). Take a look at the images below.

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Would you like to see Killer Croc emerge on Gotham? Chime in with your thoughts below. Gotham debuts with the "Pilot" episode Monday, September 22 at 8 PM ET on Fox, with the second episode, "Selina Kyle", airing on Monday, September 29.