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.
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 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.
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.