When Harvey Dent is poisoned with derivative from an extinct flower, Batman must hunt down the assailant who has the antidote, the villainous plant fanatic Poison Ivy.
An offhand remark by Mayor Hill on television spurs the Joker into sneaking onto his estate disguised as a clown at the birthday party for Hill's son, Jordan. Joker plants a bomb, but Bruce Wayne, who is attending the party, manages to defuse it. However, Jordan, who is angry at his father, runs away hiding in Joker's van.
The day after a police sting to catch a drug lord goes disastrously wrong, the events of the night before are reconstructed by the accounts of three police officers: Harvey Bullock, Renee Montoya, and a rookie.
On the election trail, Harvey Dent gradually loses control of his repressed evil alternate personality until gangster Rupert Thorne inadvertently unleashes it.
Two-Face begins robbing Rupert Thorne's business in revenge while both the gangster and Batman hunt the dichotomous supervillain for their own reasons.
While trying to thwart Penguin's robbery of a rare Faberge egg, Batman is weakened by exposure to a toxic gas. He takes shelter in a basement apartment belonging to a teen-aged amateur detective.
When a jealous scientist with a passion of Alice in Wonderland uses his mind control devices to have his dream girl for his own, Batman must intervene.
After being knocked out in a mysterious warehouse, Batman wakes up in a world where his parents are alive, he is engaged to Selina Kyle, and someone else is Batman.
On Christmas Eve, Joker broadcasts a pirate Christmas special on television. Batman and Robin have until midnight to fight their way past Joker's traps hidden all over town and rescue Commissioner Gordon, Harvey Bullock, and Summer Gleeson.
A hyper-sophisticated robot steals computer technology from Wayne Enterprises, leading Batman to a sentient supercomputer, H.A.R.D.A.C., and its plan to replace humans with androids.
When the Joker learns that a casino owner is using his likeness for the theme of his business, he escapes Arkham Asylum to destroy it while unaware of the owner's real motives.
A small-time crook has stolen an invisibility suit, which he has been using to steal jewels, and now plans to steal his young daughter from his ex-wife.
An energy weapon developed by the Army has disappeared, and Batman discovers that a mad shipping magnate who now fancies himself the god Zeus will use it to devastate Gotham.