After Harley receives access to Bruce Wayne's mind, she gets stuck in an endless loop of his most formative memory.

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.

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.

In search of a nemesis, Harley goes after Batman, but ends up with an adolescent Robin, making her the laughing stock of the criminal underworld.

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]!

Harley and crew try to infiltrate Mr. Freeze's lair only to become human lab rats for his experiments to find a cure for his cryogenically frozen wife, Nora.

Psycho unleashes a mind-controlled Ivy, Clayface, and King Shark on the Justice League who are trying to free Gotham.

In order to defeat Psycho's army, Harley & Joker need to track down Fables' storybook with the Justice League inside.

Harley crashes Ivy's wedding to stop Gordon and his officers from interrupting the nuptials.

Bruce Wayne awakens from his coma to Gotham in chaos.

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.

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.

Determined to become one of the vaunted Legion of Doom, Harley attempts to make a big splash by crashing one of their criminal enterprises with the help of her BFF, Poison Ivy.

After a falling out with her crew, Harley heads back home to Bensonhurst, where her doting mother waits for her... and her deadbeat dad, who’s more dangerous than anticipated.

Harley & Ivy go undercover as college students to take down Riddler, who’s made himself dean of the local university with sinister plans for students.

It's Bachelor/Bachelorette weekend for Ivy and Kite Man.

Harley gets an invite to the Legion of Doom’s prospective members party, but Ivy learns that she's the one they're really interested in.

Now a member of the Legion of Doom and The Joker’s equal, Harley finds herself spending time with him. Will she slip into her old ways?

After her terraforming plan goes awry, Ivy is enticed by an offer to take over the Legion of Doom, while Harley questions her path forward.

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.

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.

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.

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

When an inadvertent plant zombie apocalypse breaks out in Gotham, Harley fights to save the city, while Ivy embraces her inner supervillain.