First appearance of Harley Quinn in the mainstream DCU.
This one-shot was brought to us by writer Paul Dini and artist Yvei Guichet, with a dramatic painted cover by Alex Ross. Harley Quinn was originally created by Dini and producer Bruce Timm as the side-kick of the Joker in the fan favourite TV show Batman: The Animated Series. Harley Quinn, an unofficial part of the "No man's land" crossover saga, detailed Arkham Asylum intern Dr. Harleen Quinzel's descent into madness at the hands of her love, the Joker. Unlike her animated counterpart, however, this Harley was given a special formula by her friend and fellow Batman rogue Poison Ivy, that enhanced her agility and strength and made her a much more dangerous threat to the Caped Crusader.