Harleen Quinzel, Grad Student living with Junior or Sophomore Barbara Gordon while dating Bruce Wayne and completing her residency at Arkham. Harleen's insight into the Joker catches Bruce's attention, but he begins to ultimately care for her.

However, the ever watchful eyes of the Joker notes the change in both Harleen and the Bat and realizes the connection. Wanting to make Harleen his Harley Quinn, Joker begins to play his charms, eventually breaking out of Arkham, shooting Barbara and abducting Harleen before breaking her and creating his own twisted sidekick.