While Batman prepares to become an official GCPD consultant, Catwoman relieves sword-crazy crime lord King Scimitar of his cash. The dynamic duo confront a mentally deteriorating Two-Face. And the Joker meets a new recruit.

Robin wonders if his partner is too close to the Two-Face situation, while at the new Bat-Signal's unveiling, Joker sends a message. And a Senator prepares to testify against the Penguin, unless the Penguin can get to him first.

Mayor Hill tries to enlist Batman's help as he prepares for the fallout from Catwoman's robbery. Bruce tries to get through to Harvey. Penguin acquires a rare, extinct centerpiece for his gala. And the Riddler escapes from Arkham.

Everything goes to hell when Penguin lures Two-Face to Scarecrow's fear gas plant. Robin infiltrates Two-Face's inner circle and replaces his lucky coin. Vicki Vale and Catwoman team up to take down the Mayor together.

As Gotham braces for the upcoming Valentine's Day attack, a drugged-up flash mob channels Joker-mania. Meanwhile, Riddler has writer's block. Penguin pushes Two-Face too far. And Batman confronts Catwoman about her plans for Mayor Hill.

The Riddler gets his groove back, and The Joker interrupts Bruce's night at the opera. Bruce and Dick go to the Museum's big unveiling, where Penguin intends to settle an old grudge.

With Mayor Hill closing in, Vicki Vale and Catwoman become roommates. Riddler plays with trains. Catwoman and Two-Face cut a deal. And with Batman distracted by a gas attack, Riddler traces his signal to the Batcave.

Batman scrambles to fend off Riddler's digital assault, and Penguin catches Catwoman red-handed at the Ice Age gala. Two-Face betrays Catwoman and partners up with Penguin. And someone poisons the drinks with Scarecrow gas.

Batman must outwit the Riddler before his hijacked ocean-liner crashes into Penguin's casino, while Catwoman gets to the dark heart of Project JoyCure. King Scimitar is on his way out of town - but Joker has other plans.

A frustrated Riddler pays the Joker a house call, and Joker's Valentine's Day plans commence. Reinvigorated, King Scimitar returns to get revenge on Catwoman and her tigers. And Batman and Joker collide, back where it all began.

Batman squares off with Catwoman once again, closer to home than ever. And Harleen Quinzel, new in town and pining fruitlessly for the maniacal man of her dreams, makes a breakthrough.

With their partnership in full bloom, Two-Face has taken up residence at The Penguin's Iceberg Lounge, but the cracks are beginning to show. Meanwhile, The Penguin shocks Commissioner Gordon by turning himself in.

Scarecrow's escalating narcoterrorism spells trouble for Gotham City's youth, as Batman does everything he can to stem the tide. Meanwhile, Harleen Quinzel dives headfirst into the criminal underworld to enlist accomplices for her crusade.

As the GCPD's infiltration of Scarecrow's gang goes awry, Catwoman and Batman collide once again at the circus. Harley Quinn steps out for the first time with a night at the museum. And The Penguin makes good on his promise to Two-Face.

Two-Face sits down for his first session with Dr. Jonathan Crane...or is it their second? Harley Quinn goes shopping for the final piece of her ensemble. And Batman reconnects with ace reporter Vicki Vale, who gives him a crucial clue.

Catwoman's still in hot water, and the temperature keeps rising. Meanwhile, The Penguin's manufactured chaos has Batman and Robin running ragged - but when he finally makes his move on The Joker, things don't go to plan.

It looks like curtains for Catwoman, but she's not going down without a fight or some dangerous decisions. As Scarecrow's treatment takes effect, Two-Face finds himself...cured? And to save his friend, Bruce Wayne enters the lion's den.

Batman mounts a daring raid to free Harvey Dent from The Penguin's custody with Crane's assistance, but it'll cost him more than he bargained for. Meanwhile, Harley Quinn takes the stage to woo her man. And pressure on The Penguin mounts.

To keep his grip on the criminal underworld, The Penguin is forced to raise the stakes. Scarecrow and his gang assault Wayne Manor, and with Batman nowhere to be found, Alfred and Two-Face must band together to survive.

Laid low by Scarecrow, Batman is trapped in the depths of his mind and the fight of his life. Meanwhile, The Riddler's long running feud with Dr. Arkham reaches an inflection point. And The Penguin's fate collides with Harley Quinn.