The story of Harley Quinn is an interesting one. Harley was a good student and an excellent gymnast who had a lot of good things going for her. Though her gymnastic abilities earned her a scholarship to Gotham University, she was more interested in the University's Psychology course which was renown in the country.

Unfortunately Harley wasn't very good in the course so she eventually slept her way to a degree and was able to get a job at Arkham Asylum.  Despite numerous objections, Harley was able to get what she finally wanted: The Joker as her patient. The Asylum's administration objected to Harley's demands because they knew Joker would easily manipulate an inexperienced person like her. The Administration was right.

Joker lied and tricked his way into Harley's heart. Eventually Harley became so obsessed with her patient that she fell in love with him and  turned to crime to help him. Despite the fact that she is often abused by the Joker, Harley blames Batman for the problems in her relationship.

Other Info

Harley Quinn is the second character from the animated series to appear in the comics. Lock-Up is the first.

Harley's Origin was written by Paul Dini in the special Batman: Mad Love.