The story of how the Commissioner's daughter became Batgirl and how her best friend becomes Poision Ivy is told.

Continuing where we left off in the first part, Barbara Gordon becomes Batgirl in order to save the commissioner, but does Batman really want a sidekick?

When the Batman takes a blow to the head during a fight with the Penguin, Gotham is left without its defender while an amnesiac Bruce Wayne must consider if he's a coward or not.

After his most recent crime spree, Arnold Wesker is taken to Arkham and apparently ""cured"" by Dr. Hugo Strange. A new career as a children's entertainer lies before Wesker ... but can he escape the shadow of Scarface?

A new villain, Gearhead, makes his first appearance robbing a charity race, and Batman soon finds himself forced to upgrade the Batmobile to keep up with the cybernetic bad guy.

The Joker is on a rampage when he gets hold of Bane's injection system and turns himself into a rampaging beast.

When a rare Black Siberian Leopard is stolen, Batman and Batgirl suspect Catwoman and go to protect the second Black Siberian Leopard. But what happens when Joker beats them to the punch and brings the cats to Killgore Steed? It's a maze of doom with dangerous creatures. Can Catwoman, Batman, and Batgirl escape, or will they end up on Joker's wall?

High-ranking Gotham officials begin to embrace environmental causes after the delivery of mysterious plants, and it becomes clear they're under the influence of ... Poison Ivy.

When Wayne Industries shuts down Cosmo Krank, a toymaker with a spotty safety record, the demented villain takes revenge by trying to shut down Bruce Wayne - permanently - with his diabolical toys.

Inspired by the Batman/Batgirl partnership, the Joker decides to recruit his own sidekick and gain a partner in crime.

Maximillian Zeus, a millionaire who is also a Greek history fanatic, takes control of Gotham from the sky after losing to Mayor Grange in a re-election.

The Penguin, Mr. Freeze, and Alfred's old school chum are all on the trail of a sunken treasure in Gotham Harbor.

Hugo Strange creates a AI database called DAVE (Digitally Advanced Villain Emulator), encoded with the minds of Gotham's greatest criminals, in order to better predict their crimes. However, DAVE breaks free and proclaims himself to be "Gotham's ultimate criminal mastermind".

After a young circus performer named Dick Grayson loses his parents to a criminal named Tony Zucco, Bruce Wayne adopts the young boy. Once Bruce's secret is revealed, Dick joins Batman as his new sidekick, Robin. Together, they set out to find Zucco and bring him to justice.

After watching a movie about criminal masterminds, Penguin gets the idea to form a team of Gotham's greatest villains in order to finally take Batman down. Meanwhile, Batgirl and Robin must learn how to work together.

After the Joker's plan to make all the dogs laugh like hyenas is thwarted by Clayface (Ethan Bennett), he plans to prove himself to Batman by turning a new leaf. Meanwhile, actor Basil Karlo steals the mutagen responsible for Ethan Bennett for becoming Clayface and he becomes the new Clayface. Can Batman trust Ethan enough to help him stop Karlo?

When evidence from a series of art thefts by the Everywhere Man, a new costumed villain with the power to replicate, implicates Bruce's close friend John Marlowe, Batman believes there must be another explanation. Now, Batman must unmask the identity of the "Everywhere Man" and prove his friend's innocence.

After Batman apprehends Black Mask, his henchmen plan to spring him from Gotham P.D. so that Black Mask can activate his doomsday device. When Batman is captured, Batgirl and Robin must stop the villain on their own.

Hugo Strange infects the population of Gotham City with a virus that transforms them into zombies, and only Batman and Robin are left to find and distribute the antidote. But when Robin falls, only Batman can save the day. But not everything is at it seems ...

A thousand years into the future, the citizens of new Gotham must uncover the history of the Batman in order to stop a new Mr. Freeze.

The Bat Team goes up against an unstoppable thief who knows their every move.

The Riddler and Batman are dropped at the bottom of Gotham Harbor ... and the Riddler reveals his origins.

When Harleen Quinzell is cancelled from her television program, Joker takes an interest and decides to groom her as his new partner in crime, Harley Quinn.

The villains of Gotham City are disappearing, each one defeated and captured by an invisible vigilante named Rumor. Batman and Robin must defeat Rumor before he has a chance to execute the villains.

Bruce discovers that Wayne Industries is distributing alien technology across the world, and gains the aid of a mysterious new ally.

Martian Manhunter's prediction of an alien invasion by The Joining has come true. As Batman tries to stop them on his own, he learns that even working with a team will stop The Joining.

Batman and Superman find themselves teamed up when Lex Luthor begins his operations in Gotham City to take down his arch-nemesis, and employs a horde of the Batman's villains to do so.

Batman and Robin must battle Superman, who is under Lex Luthor's mind control, as the villain plans to launch a wave of robots and take over the world's armies.

Batman welcomes another member of the Justice League to Gotham as he teams up with Green Arrow when Vertigo, a villain who can affect people's sense of balance, arrives in the city with a diabolical plan.

Perpetual loser Firefly tries to upgrade his powers with the aid of his new girlfriend Blaze, but is exposed to radioactive phosphorous and takes on a new more dangerous identity as... Phosphorus.

Batman and Robin team up with the Flash to thwart Mirror Master's plans to trap everyone in their own mirror image.

Gotham citizens are bursting into hysterical laughter and dumping stolen goods into the river, and Batman is soon on the trail of the Joker.

Green Lantern seeks out Batman's help in locating renegade Green Lantern Sinestro, but when the villain comes to Earth, the Penguin ends up with the hero's power ring.

With the help of a slacker, Joker's mind is downloaded into a computer, enabling him to control the new WayneTech Nanobots. This creates a new and improved body who attempts to destroy Batman, Robin, and the original Joker.

A trio of college misfits use stolen mutagens from Dr. Kirk Langstrom to transform themselves into animal forms and get revenge on those who have scorned them.

Wrath and Scorn, two twins of the Dynamic Duo, are helping the villains of Gotham City. But what happens when both Batman and Wrath uncover each other's identities?

When Black Mask hires Hawkman's arch-nemesis the Shadow Thief to break him out of Arkham and assist in the theft of a meteorite, Batman must team up with fellow Justice League member Hawkman to defeat the villains.

The super-powered members of the Justice League begin disappearing one by one. Only Batman and Green Arrow are left to investigate and discover that old enemies are involved.

The heroes fight their android counterparts to recover the Justice League's powers, while the Joining prepares for its final assault on Earth.