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Harley Quinn season 4: Everything We know

(L to R) Harley Quinn (Kaley Cuoco) and Poison Ivy (Lake Bell) in Harley Quinn
(Image credit: HBO Max)

We need Harley Quinn season 4 right now, HBO Max. Because holy cow, the finale that just aired flipped Gotham on its head. If the mayoral election results weren't shocking enough? 

And since we're hiding spoilers below, we won't break down the details of what's to come this early on. Safe to say that our faves will arrive in new roles in season 4, and those situations will likely test the ties that bond them even further.

Even further complicating things is the fact that Justin Halpern and Patrick Schumacker won't be Harley Quinn season 4's showrunners. So, that's a lot of change, right? Well, let's break it all down, starting with the very good news.

Harley Quinn season 4 renewal status

HBO Max is not a stable place lately, what with the Batgirl movie cancelation and those dozens of shows and movies that disappeared. So, you would have been right to be concerned about the futures of any of your faves.

But, on August 31, weeks ahead of the Harley Quinn season 3 finale (September 15), HBO Max announced (opens in new tab) it would be ordering Harley Quinn season 4. At the same time, we learned of a shift in the show runner duties we'll get to below.

Harley Quinn season 4 release date shouldn't be far away

So, some good news to start off: Former Harley Quinn showrunner (now executive producer) Patrick Schumacker (opens in new tab) tweeted that season 4 is "Coming sooner than you think." That's likely because over two years separated seasons 2 (April 3, 2020) and 3 (July 28, 2022).

If you want to be an optimist, go back to Harley Quinn seasons 1 and 2 to extrapolate. The first season ended on February 21, 2020, less than two months before the sophomore effort debuted. We doubt such a small window could happen again, though, because that second season was a part of the original 26-episode order (opens in new tab).

All that's to say that we at Tom's Guide would theorize Harley Quinn season 4's release date will be about a year or less from now. Not as long as season 3's wait, and nothing as short as season 2's.

An image indicating spoilers are ahead.

Harley Quinn season 4 cast and characters

Batman (Diedrich Bader) and Harley Quinn (Kaley Cuoco) (dressed as Robin) on a rooftop in Harley Quinn

(Image credit: HBO Max)

The cast of Harley Quinn mostly went unchanged in season 3, but their roles are different going into season 4 than they were entering this season. 

Most pressingly of all, Harley Quinn is now ... not a villain? She's, in fact, something of a hero, working with the Bat-Family. Similarly, Alan Tudyk's Joker is now the mayor of Gotham. His Clayface is actually a successful (albeit unhappy) actor.

Ivy is now the head of the Legion of Doom, after Lex offered her that opportunity. The main cast is listed below.

  • Kaley Cuoco voicing Harley Quinn, who is now something closer to a hero than before
  • Lake Bell voicing Poison Ivy, who is still a villain
  • Alan Tudyk as Clayface, Joker and many other characters
  • Ron Funches as King Shark
  • J. B. Smoove as Frank the Plant
  • Diedrich Bader as Batman
  • Briana Cuoco as Batgirl
  • James Adomian as Bane
  • Giancarlo Esposito as Lex Luthor
  • Sanaa Lathan as Catwoman
  • Christopher Meloni as Commissioner James Gordon
  • Jacob Tremblay as Robin
  • Harvey Guillén as Nightwing

Harley Quinn season 4 crew changes

Showrunners Justin Halpern and Patrick Schumacker are giving up those chairs for executive producer roles. Series writer and consulting producer Sarah Peters — who wrote for the series since its first season — will fill both the showrunner position and become an executive producer for season 4.

Peters has excellent credentials outside of Harley Quinn, having worked on such great shows as Nathan For You, Master of None and Workaholics.

Harley Quinn season 4 plot possibilities

Okay, let's not beat around the ivy. Harley Quinn season 4 is likely to truly put #Harlivy in jeopardy. If Harley is allied with the Bat-Family and Ivy is running Lex's Legion of Doom? That's all kinds of conflict to bring home. That said, Lex's offer supposedly came with full control for Ivy. And we know better than to trust a Lex Luthor promise.  

As for the rest of the gang? King Shark may have more responsibility after killing his younger brother. Clayface may continue his run in Hollywood. And Joker? Well, the position of mayor fits him, and we can't wait to see how he sits in between Gotham's heroes and villains.

Next: Looking for something to watch? Here are 5 Prime Video movies with 90% or higher on Rotten Tomatoes.

Henry T. Casey
Senior Editor

Henry is a senior editor at Tom’s Guide covering streaming media, laptops and all things Apple, reviewing devices and services for the past seven years. Prior to joining Tom's Guide, he reviewed software and hardware for TechRadar Pro, and interviewed artists for Patek Philippe International Magazine. He's also covered the wild world of professional wrestling for Cageside Seats, interviewing athletes and other industry veterans.