Harley Quinn is fed up being the Joker’s sidekick and strikes out on her own – determined to become the criminal Queenpin of Gotham City.

When Clayface loses his arm in a heist, it turns out to be not only evidence for Jim Gordon, but also a key witness against Harley and her crew.

Harley thinks the Legion of Doom is behind Ivy's capture and the tree monsters currently ravaging Gotham. But it's a trap!

In the season finale, Harley has her final showdown with the Joker, when [spoilers] [spoil] [spoilers]. Will they [spoiler]? Maybe. But you can bet they [spoiler]!

After Gotham is declared no longer part of the United States, the newly formed Injustice League tries to seize control of the city away from Harley.

Bruce Wayne awakens from his coma to Gotham in chaos.

When Harley and Ivy spot a seemingly sane Joker, they debate whether people can change at their core, revisiting a flashback about Harleen Quinzel's first day at Arkham Asylum.

Acting as a judge, Two Face sentences Harley and Ivy to life in Bane's prison. Meanwhile, Jim Gordon and Batgirl vow to take back the GCPD from Two Face.

While Harley & Ivy deal with their post-kiss awkwardness, the President tells Gordon that he must get rid of Harley to put Gotham back on the map.

Alone on Christmas Eve, Harley reconnects with a now-sane Joker and heads to Wayne Tower, where their dinner is interrupted by an escaped Riddler and ParaDemons.

After fleeing the wedding, Harley and Ivy go on an "Eat Bang Kill" tour that leads them to a secret project Ivy abandoned years ago.

When Frank goes missing, Harley and Ivy follow clues that lead them to a highly unconventional party alongside Gotham’s elite, including Commissioner Gordon – who is hungry for campaign donations.

When The Joker runs for mayor of Gotham, Two Face attempts to sabotage his campaign.