There is no escaping terror in “Gotham” Season 4. As the Fox show heads towards its mid-season finale, Bruce Wayne actor David Mazouz teased that the second half of the season will feature one of the darkest episodes in the series.

“You can expect… the second half of the season will mark one of the worst episodes of ‘Gotham’ yet,” he told Comic Book, adding that there will be “less than likeable villains” who will “take over the city.”

Mazouz said these villains, which will be led by Jerome Valeska (Cameron Monaghan), will create a “terrible terrible fiasco.” Thankfully, the GCPD Chief Jim Gordon (Ben McKenzie) will be getting some unexpected help from a vigilante - Bruce.

Executive producer John Stephens already revealed earlier who Jerome will team up this season. “You're totally gonna see him this year,” he said of Jerome’s return. “You’re gonna see him in a new position this year, and he's gonna form an alliance with a character who he has not been near at any time soon. Essentially, we're gonna see him and Oswald Cobblepot (Robin Lord Taylor) come closer.”

In the past episode, Oswald has waged an all-out war against Sofia Falcone (Crystal Reed), Barbara Kean (Erin Richards), Tabitha Galavan (Jessica Lucas) and Selina Kyle (Carmen Bicondova). He also has Ed Nygma (Cory Michael Smith) against him, so a new partner is definitely in order for the head of Gotham’s underground.

As for Nygma, he was desperate to regain his sense of self this Season 4 after his ice block prison dulled his brain. With no one else to depend on, Nygma formed a kinship with Dr. Leslie “Lee” Thompkins (Morena Baccarin) and Solomon Grundy (Drew Powell) in the Narrows. Nygma already seemed contented with his new position, so when the Riddler came knocking again, he became upset.

It’s only a matter of time before Nygma embraces his devious side as the Riddler again. Once he does, he’ll be sure to go after the Penguin. “It's like the classic hunter going out somewhere and seeing a beautiful animal, and then deciding it's a worthy opponent, and then deciding not to kill it because it would be a shame,” Taylor said of their next battle. “Oswald has yet to really find someone who is weirdly a friend and an enemy at the same time. They just have a very fundamental connection.”

“Gotham” Season 4 airs Thursdays at 8 p.m. EST on Fox. Gotham All hell will break loose in the second half of “Gotham” Season 4, says Bruce Wayne actor David Mazouz. Photo: FOX