Villain of the Christmas Special
While her abusive boyfriend the Joker had cooked up a kidnapping plot with Toyman and Poison Ivy, Harley had been thrown off the boat into the icy waters of Gotham Harbor. She stole several million dollars from an earlier heist the Joker had made, and decided to hide out in a synagogue. There, she ran into Atom and Booster Gold, who tried to help her reform. Booster had an odd method of going about this, and ultimately wound up in a fist fight with Nightwing.
Harley was forced to return the money, and with the Joker’s plot foiled was returned to Arkham.