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 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.