'Gotham's' Ben McKenzie on the End of the Season: "Not Everybody Lives"

"The finale is just absolutely bananas."

It's been quite a year for Jim Gordon, the only honest cop featured on Fox's Gotham.

He's uncovered conspiracies inside and out of the Gotham City Police Department, been accused of murder, lost (and regained) his position as a detective and even witnessed a murderer whose preferred method of transport was balloons. As Ben McKenzie, who plays the upright hero in television's meanest city, told The Hollywood Reporter, the worst is yet to come.

"The finale is just absolutely bananas, and I couldn't even really begin to describe all the crazy things that happen in it," the actor says of the hour that will put the spotlight on the "downward spiral of Gotham."

The season finale, he noted, will see Gotham inch closer toward "ultimate anarchy" that will result in "masked vigilantes roaming the streets" — with major consequences for the characters around Gordon.

"Not everybody lives, and the people who do live don't necessarily end up mentally all there," he said. "There's a price to be paid. It's really crazy."

McKenzie, however, remained mum on the fate of departing star Jada Pinkett Smith's Fish Mooney and if one of the DC Comics' show's most colorful villains will meet her maker by season's end.

In the more immediate future, Gordon has to deal with the threat of Milo Ventimiglia's new character the Ogre — and it's very possible he'll have to do it alone. "We're introducing the Ogre, a serial killer who's searching for his perfect mate," McKenzie previewed of the story that he cautioned isn't a tale of simple romantic troubles. "He has very exacting standards that have not been met."

The Ogre has been active for years without being stopped by the cops, much to Gordon's disgust. "The reason the Ogre remains free is that any cop that comes after him pays a personal price because someone they love is killed — or tortured and killed," he says of the story with "Machiavellian twists and turns" that will push Gordon into pursuing the case, no matter the cost to himself or Leslie Thompkins (Morena Baccarin), his current love interest.

"Jim is put in a very difficult situation, and it all comes to a head toward the end in a pretty dramatic way," he warned.

Gotham airs Mondays at 8 p.m. on Fox.