It was known that Harley would be coming to "Gotham," but not if she'd arrive before Season 4. Star David Mazouz (Bruce Wayne) dropped the news about Harley into a new interview with MoviePilot.
"Something major happens in the very last scene of Season 3 for Bruce. He makes a decision, that decision will influence what he does. I don't know what's happening in Season 4 yet, I haven't had a script or talked to the writers about what's going to happen, but where I see it going is somewhere I've wanted to see it going for a very long time. You'll see what I mean. Bruce is going to be very busy taking on this new role that he assumes at the end of Season 3 and I think it'll be really cool."
MoviePilot asked if Bruce Wayne's upcoming decision may involve Harley Quinn. Here's his answer:
"She's going to be in the finale. Stay tuned."
Here's Fox's press release on the two-hour season ender:
DESTINY AWAITS ON THE ALL-NEW, SPECIAL TWO-HOUR SEASON FINALE OF "GOTHAM" MONDAY JUNE 5, ON FOX
Jada Pinkett Smith Guest-Stars as Fish Mooney
Alexander Siddig Debuts as Ra's Al Ghul
With the deadly virus spreading throughout the city, the search for the antidote continues, as Fish Mooney (guest star Jada Pinkett Smith), The Riddler and Penguin reveal plans of their own. Bruce meets Ra's Al Ghul (guest star Alexander Siddig) and completes his last task in order to fulfill his destiny, but realizes he can't let go of his past. Meanwhile, Gordon tries to win back Lee, and past alliances within Gotham City are broken, while new alliances are formed in the all-new, special two-hour "Heroes Rise: Destiny Calling/ Heroes Rise: Heavydirtysoul" season finale episode of GOTHAM airing Monday, June 5 (8:00-10:00 PM ET/PT) on FOX. (GTH-321/22) (TV-14 L, V)
Cast: Ben McKenzie as Detective James Gordon, Donal Logue as Harvey Bullock, David Mazouz as Bruce Wayne, Morena Baccarin as Leslie Thompkins, Sean Pertwee as Alfred, Robin Lord Taylor as Oswald Cobblepot/The Penguin, Erin Richards as Barbara Kean, Camren Bicondova as Selina Kyle/the future Catwoman, Cory Michael Smith as Edward Nygma/the future Riddler, Jessica Lucas as Tabitha Galavan, Chris Chalk as Lucius Fox, Drew Powell as Butch Gilzean, Maggie Geha as the future Poison Ivy, Michael Chiklis as Detective Nathaniel Barnes, Benedict Samuel as Mad Hatter
Guest Cast: Jada Pinkett Smith as Fish Mooney, Alexander Siddig as Ra's Al Ghul, Camila Perez as Firefly, Nathan Darrow as Victor Fries/Mr. Freeze, BD Wong as Hugo Strange
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