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.

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.

Harley & Ivy team up with Catwoman to steal a museum artifact that’s been boobytrapped by Dr. Trap. Meanwhile, Dr. Psycho tries to prove himself as a leader.

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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.

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.

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

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.

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

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

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