Justice League Heroes Still Remember Harley Quinn's Past Actions

Originally a career-oriented psychologist, Dr. Harleen Quinzel's life took a radical turn when she chose to take an internship at Arkham Asylum for a semester of college. Convinced by the Joker himself to do it, Harleen interviewed him and learned he was abused as a child by his alcoholic father (later learning this backstory to have been one of several different stories he had told to others, some with different details each time), and after more interviews, determined Batman was the primary source of the Joker's anger and was to blame for his actions, but that she also had fallen in love with him. Harleen helped the Joker escape and, renaming herself Harley Quinn, became his sidekick in hopes that she could win his love, going on a crime spree across the United States of America.[