It's Christmas Eve, meaning Gotham's annual tree-lighting ceremony is near. But when the children's choir goes missing from the celebration, it's up to Batman and Nightwing to track down the culprit and free the children. Then, on New Year's Eve, Catwoman resolves to turn over a new leaf and leave her life of crime behind...until her pals Poison Ivy and Harley Quinn show up for a girls' night out!