By Jonathon Dornbush
October 13, 2014 at 12:00 PM EDT

Gotham continues to populate its streets with familiar faces from the Batman universe. Villains like Two-Face and Victor Zsasz have already been announced, but the show’s producers and stars suggested a few more big names are on their way.

Speaking to IGN, director and producer Danny Cannon and actor Sean Pertwee, who plays Alfred Pennyworth, hinted at two characters who will be introduced to Gotham. Pertwee mentioned that there will be an Easter egg regarding Tommy Elliot, a.k.a the villain Hush.

In the comics, Elliot and Bruce Wayne’s histories are intertwined, as the two were friends when they were children. Since Bruce is still young on Gotham, perhaps Tommy Elliot will stop by Wayne Manor for a play date before he descends into his murderous ways.

More concretely, Cannon confirmed that Leslie Tompkins will appear on the show, and casting should be expected in the next week. Tompkins, in the comics, is a close friend and medical colleague to Bruce’s father and eventually becomes something of a parental figure for the fledgling crusader.

Cannon teased that “Jim Gordon gets to meet her through strange circumstances, when he is…” before cutting himself off for fear of spoiling her introduction. He went on to clarify that “at a very tough time in Jim’s life, he will meet Leslie Tompkins,” which hints that things won’t start improving for the detective anytime soon.

Last but perhaps most intriguing is the promise of Harley Quinn. The Joker’s right-hand woman has been a staple of the franchise since her introduction in Batman: The Animated Series, and though the clown prince’s presence on Gotham remains a mystery, there may be some hope for Quinn to appear.

During the Gotham New York Comic Con panel, a fan asked the cast and crew whether she would be added to the show’s rogues gallery. After some waffling on the point, Cannon eventually said, “We’ll get there.”

Many details remain unclear at this point. But it may be curious to have two Quinns on TV, considering her inclusion in the Arrow universe—and it should certainly keep viewers guessing as they await the introduction of Batman’s most notorious foes.