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For other uses of Harley Quinn, see Harley Quinn (disambiguation).

"Do you cuties need some counseling? I'm a trained therapist."
—Harley Quinn to John Diggle and Lyla Michaels[src]

Dr. Harleen Quinzel, otherwise known as Harley Quinn, is a former therapist and associate of both the Joker and Kiki Roulette. She is also a rejected member of the Suicide Squad, having been deemed too deranged to be trusted on the Squad's mission to appropriate the nerve agent from Gholem Qadir in Markovia.


Original multiverse[]

Early Life[]

At some point, Harleen became a trained therapist.[1] However, she suffered a psychotic break, resulting in her becoming incarcerated and temporarily joining the Suicide Squad as Harley Quinn.[2]

Task Force X[]

Amanda Waller and Harley Quinn

Amanda Waller and Harley Quinn.

While John Diggle and Lyla Michaels were arguing outside of A.R.G.U.S. holding cells, Harley offered to help them through their problems, claiming she was a trained therapist. Amanda Waller then hit her door to silence her.[1]

Diggle later commented that the Suicide Squad found Carrie Cutter to be "even nuttier" than Harley.[2]

Anti-Monitor Crisis[]

During the Anti-Monitor Crisis, Harleen as well as everyone in the multiverse except for the seven Paragons, was killed in an antimatter wave by the Anti-Monitor on December 10, 2019,[3] only to be restored a month later, after the Paragons and the Spectre created a new universe.[4]

New multiverse[]

Working with the Joker[]

In the new multiverse, Harleen is a former doctor who suffered a psychotic break[5] and began working with the Joker under the codename Harley Quinn.[6]

At some point, Harleen became the therapist for the Joker's toymaker, Kiki Roulette.[7] After Batman killed the Joker, it is unknown what happened to Harleen.


  • Medical knowledge: Harleen is an official (discredited) doctor and therefore has the intelligence associated with her title through a strong understanding of medicine and health.


  • Mental Instability: According to John Diggle and Floyd Lawton, Harley's mental state after her psychotic break makes her unpredictable and volatile. Because of this, she was left out of multiple Task Force X missions. Alice also shared this sentiment.



Season 2[]

Season 3[]


Season 3[]



  • Harleen's nickname for John Diggle, "Chocolate Pudding", is a reference to her comic book counterpart's nickname for The Joker, "Puddin'".
  • In "Trust Destiny", many of Marquis's guests at his party are dressed in harlequin like outfits. This being a reference to Harley Quinn, specifically her classic motif.
  • Harley Quinn's mallet

    A mallet in Joker's workshop.

    In "Broken Toys", a Mallet is seen in the Joker's workshop that resembles Harley's Mallet in the comics.

Behind the scenes[]

"I want to manage expectations with respect to Harley Quinn. She was always intended to be an Easter egg. I don't want people to go in with incorrect expectations and walk away from Episode 16 disappointed. But there is an element to the Easter egg that was not spoiled by the promo, that I think people will find a lot of fun."
Marc Guggenheim[8]
  • Producer Marc Guggenheim admitted that although the character was indeed Harley Quinn, a long-time enemy of Batman, the character was simply an Easter egg for fans and was instead credited as "Deranged Woman" in the end credits of "Suicide Squad".
  • Harley is voiced by Tara Strong, who uses the same voice she uses for Harley Quinn in various DC properties since 2011.
  • According to Stephen Amell, Harley was planned to appear in the Season 2 finale, "Unthinkable", but the scene was cut due to time.[9]
  • In the DC comics, Harley Quinn is Harleen Quinzel, a former psychiatrist previously employed at Arkham Asylum, a former criminal, a mercenary, and the ex-girlfriend and sidekick of the Joker. While her intentions are typically good, her methods often betray her insanity, Quinn has acted as both ally and enemy to Batman and sometimes a member of the Suicide Squad.