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 and Ivy team up with Catwoman to steal an artifact from a museum that's been booby trapped by none other than Dr. Trap; Dr. Psycho tries to prove himself as a leader, which Riddler exploits as an opportunity to escape.

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.

Bruce Wayne awakens from his coma to find Gotham in shambles. Meanwhile, Two-Face attempts to forge a criminal alliance with Bane, to be the only two Big Bads left in Gotham.

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

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.

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.

Darkseid agrees to give Psycho the world if he brings him the head of Harley Quinn, so Psycho controls Ivy to set her against Harley.

Ivy and Kite Man's wedding plans are threatened to be derailed by an overzealous Commissioner Gordon who can't resist a party with all of Gotham's biggest villains.