“Gotham” Season 2 will continue to show the city of Gotham being terrorized. A new trailer teases that Jim Gordon (Ben McKenzie) will have a tough time fighting crime this year. The villains will even infiltrate the police department.

The newest trailer, first reported by TVLine, shows old and new bad guys. Penguin (Robin Lord Taylor) is shown briefly, and Edward Nygma (Cory Michael Smith) appears to be closer to becoming the Riddler. Theo Galvan (James Frain), Tigress (Jessica Lucas) and other new villains also do their best to create havoc. However, one villain appears more than anyone else: Jerome (Cameron Monaghan), a.k.a. the most likely candidate for the Joker.

Though he appears to be wearing a prison uniform early in the video, it doesn’t seem like he’ll stay locked up for long. He has a gun and even ends up at the GCPD wearing a police uniform. It looks like Jerome refuses to be afraid of Gordon and his coworkers. “You ain’t seen nothing yet!” Jerome laughs to a security camera.

It also seems like the possible Joker will team up with other villains. “The laugh is fabulous,” Theo tells him. “Use that.”

Watch the trailer for “Gotham” Season 2 below:

While the trailer certainly makes Jerome look like the Joker, it’s unclear if he’ll actually be Batman’s (David Mazouz) nemesis. “This is not a red herring,” Heller told E! Online in February. “It's the beginning of the story of how the Joker came to be, how the Joker was created, where he came from, who he is. Now, that doesn't necessarily mean that Cameron Monaghan is the Joker. He might be.”

In any case, it looks like Jerome will be around for a while, as will the other villains. There will be more focus on long-term villains instead of different weekly bad guys in Season 2. “I think we made a mistake relatively early on in trying to introduce a villain and take care of that villain in one episode: catch them, send them to Arkham, do whatever,” McKenzie told Entertainment Weekly. “That was just a mistake. We should’ve never done it.” He promised that the show was working to fix that mistake.

“Gotham” Season 2 premieres Monday, Sept. 21 on Fox at 8 p.m. EDT.