In Season 4, Gotham will see Ben MacKenzie's Jim Gordon and Donal Logue's Harvey Bullock clash in a way that could permanently divide the men who've worked closely together since the show's inception.

Bullock has always been morally conflicted and ambiguous, things that are typically problematic for a cop. This season, according to MacKenzie and Logue, Gordon and Bullock's will be unable to ignore their differing value systems.

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"With us... the two of us, this conflict that starts off at the beginning of the season only gets deeper and deeper and deeper until the point where something has to break and at the end of the day their relationship breaks," MacKenzie told the press at New York Comic Con. "At least for a while. And it's all tied up in what is law enforcement's role in Gotham, if any. What does it mean, but how Jim gets there and how he gets to where he's going to get to takes a price and Harvey knows that price. So, I'm not a boy scout any more, and we both kind of have to look at each other with cold sober eyes and reevaluate each other."

That said, MacKenzie, who's now taken on the role of writer and director on the series for certain episodes, pointed out that when Bullock does something distasteful, it's usually because he feels he has to.

"Bullock really wears the weight of Gotham on his shoulders," he said of the world-weary character. "I think you really see that this season as Jim is kind of butting heads with him a lot, and Bullock is the guy doing what he has to do to keep things sort of settled in Gotham. He's giving over to Penguin, he's letting the department sort of look the other way on these crimes. Jim can't stand for that, but there's a weight and a price to be paid for sort of bucking up against the system."

Neither man is wrong, depending on the circumstance, but with their approaches to the policing of Gotham at such odds, only one can steer the direction of Gotham's law enforcement. It'll be interesting to see if the two men find their way back to each other once their friendship is torn asunder.

Airing Thursdays at 8 p.m. ET/PT on Fox, Gotham stars Ben McKenzie as James Gordon, Donal Logue as Harvey Bullock, David Mazouz as Bruce Wayne, Robin Lord Taylor as Penguin, Cameron Bicondova as Selina Kyle, Erin Richards as Barbara Kean and Sean Pertwee as Alfred Pennyworth.