During the Christmas season, Harley and Poison Ivy lure Bruce into a hypnotic shopping spree while Joker threatens Gotham with a sonic bomb loud enough to deafen anyone within earshot of its explosion.

The origins of Tim Drake are traced, from street-tough and member of Two-Face's gang to the new Robin.

Mr. Freeze returns and seeks revenge on Gotham City, with a big surprise for Batman.

Arnold Wesker is released from Arkham, completely free of his Scarface persona. But Scarface's old gang, needing their old boss back, begin working to drive Wesker back to his old ways.

Crime boss Edward "The King" Barlow dies and in his will leaves his arch-rival, the Joker, a large fortune. Joker immediately goes on a shopping spree, even searching for a replacement for Harley Quinn, but realizes too late that all the money is fake.

During a fight with the Scarecrow, Batgirl is ambushed on a rooftop and falls to her death. Having watched his daughter's demise, Jim Gordon blames Batman for her fate and vows revenge, even recruiting Bane in the process.

Baby Doll becomes enamored of Killer Croc, and the pair forms a very unlikely yet very successful criminal duo. However, their partnership soon falls apart when Baby Doll learns that Croc is only using her to further his own criminal career.

A genetic engineer goes overboard in creating bigger livestock and loses all his money. A year later, an army of mutant farm animals terrorize Gotham City.

Livewire escapes during a prison transfer and runs amok in Gotham, joining forces with Poison Ivy and Harley Quinn. With the Dark Knight away, Batgirl teams up with Supergirl to face the deadly trio.